--- a/engine/sqlite/src/insert.cpp Wed May 26 10:44:32 2010 +0100
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,1626 +0,0 @@
-/*
-** 2001 September 15
-**
-** The author disclaims copyright to this source code. In place of
-** a legal notice, here is a blessing:
-**
-** May you do good and not evil.
-** May you find forgiveness for yourself and forgive others.
-** May you share freely, never taking more than you give.
-**
-*************************************************************************
-** This file contains C code routines that are called by the parser
-** to handle INSERT statements in SQLite.
-**
-** $Id: insert.cpp 1282 2008-11-13 09:31:33Z LarsPson $
-*/
-#include "sqliteInt.h"
-
-/*
-** Set P3 of the most recently inserted opcode to a column affinity
-** string for index pIdx. A column affinity string has one character
-** for each column in the table, according to the affinity of the column:
-**
-** Character Column affinity
-** ------------------------------
-** 'a' TEXT
-** 'b' NONE
-** 'c' NUMERIC
-** 'd' INTEGER
-** 'e' REAL
-*/
-void sqlite3IndexAffinityStr(Vdbe *v, Index *pIdx){
- if( !pIdx->zColAff ){
- /* The first time a column affinity string for a particular index is
- ** required, it is allocated and populated here. It is then stored as
- ** a member of the Index structure for subsequent use.
- **
- ** The column affinity string will eventually be deleted by
- ** sqliteDeleteIndex() when the Index structure itself is cleaned
- ** up.
- */
- int n;
- Table *pTab = pIdx->pTable;
- sqlite3 *db = sqlite3VdbeDb(v);
- pIdx->zColAff = (char *)sqlite3DbMallocZero(db, pIdx->nColumn+1);
- if( !pIdx->zColAff ){
- return;
- }
- for(n=0; n<pIdx->nColumn; n++){
- pIdx->zColAff[n] = pTab->aCol[pIdx->aiColumn[n]].affinity;
- }
- pIdx->zColAff[pIdx->nColumn] = '\0';
- }
-
- sqlite3VdbeChangeP3(v, -1, pIdx->zColAff, 0);
-}
-
-/*
-** Set P3 of the most recently inserted opcode to a column affinity
-** string for table pTab. A column affinity string has one character
-** for each column indexed by the index, according to the affinity of the
-** column:
-**
-** Character Column affinity
-** ------------------------------
-** 'a' TEXT
-** 'b' NONE
-** 'c' NUMERIC
-** 'd' INTEGER
-** 'e' REAL
-*/
-void sqlite3TableAffinityStr(Vdbe *v, Table *pTab){
- /* The first time a column affinity string for a particular table
- ** is required, it is allocated and populated here. It is then
- ** stored as a member of the Table structure for subsequent use.
- **
- ** The column affinity string will eventually be deleted by
- ** sqlite3DeleteTable() when the Table structure itself is cleaned up.
- */
- if( !pTab->zColAff ){
- char *zColAff;
- int i;
- sqlite3 *db = sqlite3VdbeDb(v);
-
- zColAff = (char *)sqlite3DbMallocZero(db, pTab->nCol+1);
- if( !zColAff ){
- return;
- }
-
- for(i=0; i<pTab->nCol; i++){
- zColAff[i] = pTab->aCol[i].affinity;
- }
- zColAff[pTab->nCol] = '\0';
-
- pTab->zColAff = zColAff;
- }
-
- sqlite3VdbeChangeP3(v, -1, pTab->zColAff, 0);
-}
-
-/*
-** Return non-zero if the table pTab in database iDb or any of its indices
-** have been opened at any point in the VDBE program beginning at location
-** iStartAddr throught the end of the program. This is used to see if
-** a statement of the form "INSERT INTO <iDb, pTab> SELECT ..." can
-** run without using temporary table for the results of the SELECT.
-*/
-static int readsTable(Vdbe *v, int iStartAddr, int iDb, Table *pTab){
- int i;
- int iEnd = sqlite3VdbeCurrentAddr(v);
- for(i=iStartAddr; i<iEnd; i++){
- VdbeOp *pOp = sqlite3VdbeGetOp(v, i);
- assert( pOp!=0 );
- if( pOp->opcode==OP_OpenRead ){
- VdbeOp *pPrior = &pOp[-1];
- int tnum = pOp->p2;
- assert( i>iStartAddr );
- assert( pPrior->opcode==OP_Integer );
- if( pPrior->p1==iDb ){
- Index *pIndex;
- if( tnum==pTab->tnum ){
- return 1;
- }
- for(pIndex=pTab->pIndex; pIndex; pIndex=pIndex->pNext){
- if( tnum==pIndex->tnum ){
- return 1;
- }
- }
- }
- }
-#ifndef SQLITE_OMIT_VIRTUALTABLE
- if( pOp->opcode==OP_VOpen && pOp->p3==(const char*)pTab->pVtab ){
- assert( pOp->p3!=0 );
- assert( pOp->p3type==P3_VTAB );
- return 1;
- }
-#endif
- }
- return 0;
-}
-
-#ifndef SQLITE_OMIT_AUTOINCREMENT
-/*
-** Write out code to initialize the autoincrement logic. This code
-** looks up the current autoincrement value in the sqlite_sequence
-** table and stores that value in a memory cell. Code generated by
-** autoIncStep() will keep that memory cell holding the largest
-** rowid value. Code generated by autoIncEnd() will write the new
-** largest value of the counter back into the sqlite_sequence table.
-**
-** This routine returns the index of the mem[] cell that contains
-** the maximum rowid counter.
-**
-** Two memory cells are allocated. The next memory cell after the
-** one returned holds the rowid in sqlite_sequence where we will
-** write back the revised maximum rowid.
-*/
-static int autoIncBegin(
- Parse *pParse, /* Parsing context */
- int iDb, /* Index of the database holding pTab */
- Table *pTab /* The table we are writing to */
-){
- int memId = 0;
- if( pTab->autoInc ){
- Vdbe *v = pParse->pVdbe;
- Db *pDb = &pParse->db->aDb[iDb];
- int iCur = pParse->nTab;
- int addr;
- assert( v );
- addr = sqlite3VdbeCurrentAddr(v);
- memId = pParse->nMem+1;
- pParse->nMem += 2;
- sqlite3OpenTable(pParse, iCur, iDb, pDb->pSchema->pSeqTab, OP_OpenRead);
- sqlite3VdbeAddOp(v, OP_Rewind, iCur, addr+13);
- sqlite3VdbeAddOp(v, OP_Column, iCur, 0);
- sqlite3VdbeOp3(v, OP_String8, 0, 0, pTab->zName, 0);
- sqlite3VdbeAddOp(v, OP_Ne, 0x100, addr+12);
- sqlite3VdbeAddOp(v, OP_Rowid, iCur, 0);
- sqlite3VdbeAddOp(v, OP_MemStore, memId-1, 1);
- sqlite3VdbeAddOp(v, OP_Column, iCur, 1);
- sqlite3VdbeAddOp(v, OP_MemStore, memId, 1);
- sqlite3VdbeAddOp(v, OP_Goto, 0, addr+13);
- sqlite3VdbeAddOp(v, OP_Next, iCur, addr+4);
- sqlite3VdbeAddOp(v, OP_Close, iCur, 0);
- }
- return memId;
-}
-
-/*
-** Update the maximum rowid for an autoincrement calculation.
-**
-** This routine should be called when the top of the stack holds a
-** new rowid that is about to be inserted. If that new rowid is
-** larger than the maximum rowid in the memId memory cell, then the
-** memory cell is updated. The stack is unchanged.
-*/
-static void autoIncStep(Parse *pParse, int memId){
- if( memId>0 ){
- sqlite3VdbeAddOp(pParse->pVdbe, OP_MemMax, memId, 0);
- }
-}
-
-/*
-** After doing one or more inserts, the maximum rowid is stored
-** in mem[memId]. Generate code to write this value back into the
-** the sqlite_sequence table.
-*/
-static void autoIncEnd(
- Parse *pParse, /* The parsing context */
- int iDb, /* Index of the database holding pTab */
- Table *pTab, /* Table we are inserting into */
- int memId /* Memory cell holding the maximum rowid */
-){
- if( pTab->autoInc ){
- int iCur = pParse->nTab;
- Vdbe *v = pParse->pVdbe;
- Db *pDb = &pParse->db->aDb[iDb];
- int addr;
- assert( v );
- addr = sqlite3VdbeCurrentAddr(v);
- sqlite3OpenTable(pParse, iCur, iDb, pDb->pSchema->pSeqTab, OP_OpenWrite);
- sqlite3VdbeAddOp(v, OP_MemLoad, memId-1, 0);
- sqlite3VdbeAddOp(v, OP_NotNull, -1, addr+7);
- sqlite3VdbeAddOp(v, OP_Pop, 1, 0);
- sqlite3VdbeAddOp(v, OP_NewRowid, iCur, 0);
- sqlite3VdbeOp3(v, OP_String8, 0, 0, pTab->zName, 0);
- sqlite3VdbeAddOp(v, OP_MemLoad, memId, 0);
- sqlite3VdbeAddOp(v, OP_MakeRecord, 2, 0);
- sqlite3VdbeAddOp(v, OP_Insert, iCur, OPFLAG_APPEND);
- sqlite3VdbeAddOp(v, OP_Close, iCur, 0);
- }
-}
-#else
-/*
-** If SQLITE_OMIT_AUTOINCREMENT is defined, then the three routines
-** above are all no-ops
-*/
-# define autoIncBegin(A,B,C) (0)
-# define autoIncStep(A,B)
-# define autoIncEnd(A,B,C,D)
-#endif /* SQLITE_OMIT_AUTOINCREMENT */
-
-
-/* Forward declaration */
-static int xferOptimization(
- Parse *pParse, /* Parser context */
- Table *pDest, /* The table we are inserting into */
- Select *pSelect, /* A SELECT statement to use as the data source */
- int onError, /* How to handle constraint errors */
- int iDbDest /* The database of pDest */
-);
-
-/*
-** This routine is call to handle SQL of the following forms:
-**
-** insert into TABLE (IDLIST) values(EXPRLIST)
-** insert into TABLE (IDLIST) select
-**
-** The IDLIST following the table name is always optional. If omitted,
-** then a list of all columns for the table is substituted. The IDLIST
-** appears in the pColumn parameter. pColumn is NULL if IDLIST is omitted.
-**
-** The pList parameter holds EXPRLIST in the first form of the INSERT
-** statement above, and pSelect is NULL. For the second form, pList is
-** NULL and pSelect is a pointer to the select statement used to generate
-** data for the insert.
-**
-** The code generated follows one of four templates. For a simple
-** select with data coming from a VALUES clause, the code executes
-** once straight down through. The template looks like this:
-**
-** open write cursor to <table> and its indices
-** puts VALUES clause expressions onto the stack
-** write the resulting record into <table>
-** cleanup
-**
-** The three remaining templates assume the statement is of the form
-**
-** INSERT INTO <table> SELECT ...
-**
-** If the SELECT clause is of the restricted form "SELECT * FROM <table2>" -
-** in other words if the SELECT pulls all columns from a single table
-** and there is no WHERE or LIMIT or GROUP BY or ORDER BY clauses, and
-** if <table2> and <table1> are distinct tables but have identical
-** schemas, including all the same indices, then a special optimization
-** is invoked that copies raw records from <table2> over to <table1>.
-** See the xferOptimization() function for the implementation of this
-** template. This is the second template.
-**
-** open a write cursor to <table>
-** open read cursor on <table2>
-** transfer all records in <table2> over to <table>
-** close cursors
-** foreach index on <table>
-** open a write cursor on the <table> index
-** open a read cursor on the corresponding <table2> index
-** transfer all records from the read to the write cursors
-** close cursors
-** end foreach
-**
-** The third template is for when the second template does not apply
-** and the SELECT clause does not read from <table> at any time.
-** The generated code follows this template:
-**
-** goto B
-** A: setup for the SELECT
-** loop over the rows in the SELECT
-** gosub C
-** end loop
-** cleanup after the SELECT
-** goto D
-** B: open write cursor to <table> and its indices
-** goto A
-** C: insert the select result into <table>
-** return
-** D: cleanup
-**
-** The fourth template is used if the insert statement takes its
-** values from a SELECT but the data is being inserted into a table
-** that is also read as part of the SELECT. In the third form,
-** we have to use a intermediate table to store the results of
-** the select. The template is like this:
-**
-** goto B
-** A: setup for the SELECT
-** loop over the tables in the SELECT
-** gosub C
-** end loop
-** cleanup after the SELECT
-** goto D
-** C: insert the select result into the intermediate table
-** return
-** B: open a cursor to an intermediate table
-** goto A
-** D: open write cursor to <table> and its indices
-** loop over the intermediate table
-** transfer values form intermediate table into <table>
-** end the loop
-** cleanup
-*/
-void sqlite3Insert(
- Parse *pParse, /* Parser context */
- SrcList *pTabList, /* Name of table into which we are inserting */
- ExprList *pList, /* List of values to be inserted */
- Select *pSelect, /* A SELECT statement to use as the data source */
- IdList *pColumn, /* Column names corresponding to IDLIST. */
- int onError /* How to handle constraint errors */
-){
- Table *pTab; /* The table to insert into */
- char *zTab; /* Name of the table into which we are inserting */
- const char *zDb; /* Name of the database holding this table */
- int i, j, idx; /* Loop counters */
- Vdbe *v; /* Generate code into this virtual machine */
- Index *pIdx; /* For looping over indices of the table */
- int nColumn; /* Number of columns in the data */
- int base = 0; /* VDBE Cursor number for pTab */
- int iCont=0,iBreak=0; /* Beginning and end of the loop over srcTab */
- sqlite3 *db; /* The main database structure */
- int keyColumn = -1; /* Column that is the INTEGER PRIMARY KEY */
- int endOfLoop; /* Label for the end of the insertion loop */
- int useTempTable = 0; /* Store SELECT results in intermediate table */
- int srcTab = 0; /* Data comes from this temporary cursor if >=0 */
- int iSelectLoop = 0; /* Address of code that implements the SELECT */
- int iCleanup = 0; /* Address of the cleanup code */
- int iInsertBlock = 0; /* Address of the subroutine used to insert data */
- int iCntMem = 0; /* Memory cell used for the row counter */
- int newIdx = -1; /* Cursor for the NEW table */
- Db *pDb; /* The database containing table being inserted into */
- int counterMem = 0; /* Memory cell holding AUTOINCREMENT counter */
- int appendFlag = 0; /* True if the insert is likely to be an append */
- int iDb;
-
- int nHidden = 0;
-
-#ifndef SQLITE_OMIT_TRIGGER
- int isView; /* True if attempting to insert into a view */
- int triggers_exist = 0; /* True if there are FOR EACH ROW triggers */
-#endif
-
- db = pParse->db;
- if( pParse->nErr || db->mallocFailed ){
- goto insert_cleanup;
- }
-
- /* Locate the table into which we will be inserting new information.
- */
- assert( pTabList->nSrc==1 );
- zTab = pTabList->a[0].zName;
- if( zTab==0 ) goto insert_cleanup;
- pTab = sqlite3SrcListLookup(pParse, pTabList);
- if( pTab==0 ){
- goto insert_cleanup;
- }
- iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
- assert( iDb<db->nDb );
- pDb = &db->aDb[iDb];
- zDb = pDb->zName;
- if( sqlite3AuthCheck(pParse, SQLITE_INSERT, pTab->zName, 0, zDb) ){
- goto insert_cleanup;
- }
-
- /* Figure out if we have any triggers and if the table being
- ** inserted into is a view
- */
-#ifndef SQLITE_OMIT_TRIGGER
- triggers_exist = sqlite3TriggersExist(pParse, pTab, TK_INSERT, 0);
- isView = pTab->pSelect!=0;
-#else
-# define triggers_exist 0
-# define isView 0
-#endif
-#ifdef SQLITE_OMIT_VIEW
-# undef isView
-# define isView 0
-#endif
-
- /* Ensure that:
- * (a) the table is not read-only,
- * (b) that if it is a view then ON INSERT triggers exist
- */
- if( sqlite3IsReadOnly(pParse, pTab, triggers_exist) ){
- goto insert_cleanup;
- }
- assert( pTab!=0 );
-
- /* If pTab is really a view, make sure it has been initialized.
- ** ViewGetColumnNames() is a no-op if pTab is not a view (or virtual
- ** module table).
- */
- if( sqlite3ViewGetColumnNames(pParse, pTab) ){
- goto insert_cleanup;
- }
-
- /* Allocate a VDBE
- */
- v = sqlite3GetVdbe(pParse);
- if( v==0 ) goto insert_cleanup;
- if( pParse->nested==0 ) sqlite3VdbeCountChanges(v);
- sqlite3BeginWriteOperation(pParse, pSelect || triggers_exist, iDb);
-
- /* if there are row triggers, allocate a temp table for new.* references. */
- if( triggers_exist ){
- newIdx = pParse->nTab++;
- }
-
-#ifndef SQLITE_OMIT_XFER_OPT
- /* If the statement is of the form
- **
- ** INSERT INTO <table1> SELECT * FROM <table2>;
- **
- ** Then special optimizations can be applied that make the transfer
- ** very fast and which reduce fragmentation of indices.
- */
- if( pColumn==0 && xferOptimization(pParse, pTab, pSelect, onError, iDb) ){
- assert( !triggers_exist );
- assert( pList==0 );
- goto insert_cleanup;
- }
-#endif /* SQLITE_OMIT_XFER_OPT */
-
- /* If this is an AUTOINCREMENT table, look up the sequence number in the
- ** sqlite_sequence table and store it in memory cell counterMem. Also
- ** remember the rowid of the sqlite_sequence table entry in memory cell
- ** counterRowid.
- */
- counterMem = autoIncBegin(pParse, iDb, pTab);
-
- /* Figure out how many columns of data are supplied. If the data
- ** is coming from a SELECT statement, then this step also generates
- ** all the code to implement the SELECT statement and invoke a subroutine
- ** to process each row of the result. (Template 2.) If the SELECT
- ** statement uses the the table that is being inserted into, then the
- ** subroutine is also coded here. That subroutine stores the SELECT
- ** results in a temporary table. (Template 3.)
- */
- if( pSelect ){
- /* Data is coming from a SELECT. Generate code to implement that SELECT
- */
- int rc, iInitCode;
- iInitCode = sqlite3VdbeAddOp(v, OP_Goto, 0, 0);
- iSelectLoop = sqlite3VdbeCurrentAddr(v);
- iInsertBlock = sqlite3VdbeMakeLabel(v);
-
- /* Resolve the expressions in the SELECT statement and execute it. */
- rc = sqlite3Select(pParse, pSelect, SRT_Subroutine, iInsertBlock,0,0,0,0);
- if( rc || pParse->nErr || db->mallocFailed ){
- goto insert_cleanup;
- }
-
- iCleanup = sqlite3VdbeMakeLabel(v);
- sqlite3VdbeAddOp(v, OP_Goto, 0, iCleanup);
- assert( pSelect->pEList );
- nColumn = pSelect->pEList->nExpr;
-
- /* Set useTempTable to TRUE if the result of the SELECT statement
- ** should be written into a temporary table. Set to FALSE if each
- ** row of the SELECT can be written directly into the result table.
- **
- ** A temp table must be used if the table being updated is also one
- ** of the tables being read by the SELECT statement. Also use a
- ** temp table in the case of row triggers.
- */
- if( triggers_exist || readsTable(v, iSelectLoop, iDb, pTab) ){
- useTempTable = 1;
- }
-
- if( useTempTable ){
- /* Generate the subroutine that SELECT calls to process each row of
- ** the result. Store the result in a temporary table
- */
- srcTab = pParse->nTab++;
- sqlite3VdbeResolveLabel(v, iInsertBlock);
- sqlite3VdbeAddOp(v, OP_StackDepth, -1, 0);
- sqlite3VdbeAddOp(v, OP_MakeRecord, nColumn, 0);
- sqlite3VdbeAddOp(v, OP_NewRowid, srcTab, 0);
- sqlite3VdbeAddOp(v, OP_Pull, 1, 0);
- sqlite3VdbeAddOp(v, OP_Insert, srcTab, OPFLAG_APPEND);
- sqlite3VdbeAddOp(v, OP_Return, 0, 0);
-
- /* The following code runs first because the GOTO at the very top
- ** of the program jumps to it. Create the temporary table, then jump
- ** back up and execute the SELECT code above.
- */
- sqlite3VdbeJumpHere(v, iInitCode);
- sqlite3VdbeAddOp(v, OP_OpenEphemeral, srcTab, 0);
- sqlite3VdbeAddOp(v, OP_SetNumColumns, srcTab, nColumn);
- sqlite3VdbeAddOp(v, OP_Goto, 0, iSelectLoop);
- sqlite3VdbeResolveLabel(v, iCleanup);
- }else{
- sqlite3VdbeJumpHere(v, iInitCode);
- }
- }else{
- /* This is the case if the data for the INSERT is coming from a VALUES
- ** clause
- */
- NameContext sNC;
- memset(&sNC, 0, sizeof(sNC));
- sNC.pParse = pParse;
- srcTab = -1;
- assert( useTempTable==0 );
- nColumn = pList ? pList->nExpr : 0;
- for(i=0; i<nColumn; i++){
- if( sqlite3ExprResolveNames(&sNC, pList->a[i].pExpr) ){
- goto insert_cleanup;
- }
- }
- }
-
- /* Make sure the number of columns in the source data matches the number
- ** of columns to be inserted into the table.
- */
- if( IsVirtual(pTab) ){
- for(i=0; i<pTab->nCol; i++){
- nHidden += (IsHiddenColumn(&pTab->aCol[i]) ? 1 : 0);
- }
- }
- if( pColumn==0 && nColumn && nColumn!=(pTab->nCol-nHidden) ){
- sqlite3ErrorMsg(pParse,
- "table %S has %d columns but %d values were supplied",
- pTabList, 0, pTab->nCol, nColumn);
- goto insert_cleanup;
- }
- if( pColumn!=0 && nColumn!=pColumn->nId ){
- sqlite3ErrorMsg(pParse, "%d values for %d columns", nColumn, pColumn->nId);
- goto insert_cleanup;
- }
-
- /* If the INSERT statement included an IDLIST term, then make sure
- ** all elements of the IDLIST really are columns of the table and
- ** remember the column indices.
- **
- ** If the table has an INTEGER PRIMARY KEY column and that column
- ** is named in the IDLIST, then record in the keyColumn variable
- ** the index into IDLIST of the primary key column. keyColumn is
- ** the index of the primary key as it appears in IDLIST, not as
- ** is appears in the original table. (The index of the primary
- ** key in the original table is pTab->iPKey.)
- */
- if( pColumn ){
- for(i=0; i<pColumn->nId; i++){
- pColumn->a[i].idx = -1;
- }
- for(i=0; i<pColumn->nId; i++){
- for(j=0; j<pTab->nCol; j++){
- if( sqlite3StrICmp(pColumn->a[i].zName, pTab->aCol[j].zName)==0 ){
- pColumn->a[i].idx = j;
- if( j==pTab->iPKey ){
- keyColumn = i;
- }
- break;
- }
- }
- if( j>=pTab->nCol ){
- if( sqlite3IsRowid(pColumn->a[i].zName) ){
- keyColumn = i;
- }else{
- sqlite3ErrorMsg(pParse, "table %S has no column named %s",
- pTabList, 0, pColumn->a[i].zName);
- pParse->nErr++;
- goto insert_cleanup;
- }
- }
- }
- }
-
- /* If there is no IDLIST term but the table has an integer primary
- ** key, the set the keyColumn variable to the primary key column index
- ** in the original table definition.
- */
- if( pColumn==0 && nColumn>0 ){
- keyColumn = pTab->iPKey;
- }
-
- /* Open the temp table for FOR EACH ROW triggers
- */
- if( triggers_exist ){
- sqlite3VdbeAddOp(v, OP_OpenPseudo, newIdx, 0);
- sqlite3VdbeAddOp(v, OP_SetNumColumns, newIdx, pTab->nCol);
- }
-
- /* Initialize the count of rows to be inserted
- */
- if( db->flags & SQLITE_CountRows ){
- iCntMem = pParse->nMem++;
- sqlite3VdbeAddOp(v, OP_MemInt, 0, iCntMem);
- }
-
- /* Open tables and indices if there are no row triggers */
- if( !triggers_exist ){
- base = pParse->nTab;
- sqlite3OpenTableAndIndices(pParse, pTab, base, OP_OpenWrite);
- }
-
- /* If the data source is a temporary table, then we have to create
- ** a loop because there might be multiple rows of data. If the data
- ** source is a subroutine call from the SELECT statement, then we need
- ** to launch the SELECT statement processing.
- */
- if( useTempTable ){
- iBreak = sqlite3VdbeMakeLabel(v);
- sqlite3VdbeAddOp(v, OP_Rewind, srcTab, iBreak);
- iCont = sqlite3VdbeCurrentAddr(v);
- }else if( pSelect ){
- sqlite3VdbeAddOp(v, OP_Goto, 0, iSelectLoop);
- sqlite3VdbeResolveLabel(v, iInsertBlock);
- sqlite3VdbeAddOp(v, OP_StackDepth, -1, 0);
- }
-
- /* Run the BEFORE and INSTEAD OF triggers, if there are any
- */
- endOfLoop = sqlite3VdbeMakeLabel(v);
- if( triggers_exist & TRIGGER_BEFORE ){
-
- /* build the NEW.* reference row. Note that if there is an INTEGER
- ** PRIMARY KEY into which a NULL is being inserted, that NULL will be
- ** translated into a unique ID for the row. But on a BEFORE trigger,
- ** we do not know what the unique ID will be (because the insert has
- ** not happened yet) so we substitute a rowid of -1
- */
- if( keyColumn<0 ){
- sqlite3VdbeAddOp(v, OP_Integer, -1, 0);
- }else if( useTempTable ){
- sqlite3VdbeAddOp(v, OP_Column, srcTab, keyColumn);
- }else{
- assert( pSelect==0 ); /* Otherwise useTempTable is true */
- sqlite3ExprCode(pParse, pList->a[keyColumn].pExpr);
- sqlite3VdbeAddOp(v, OP_NotNull, -1, sqlite3VdbeCurrentAddr(v)+3);
- sqlite3VdbeAddOp(v, OP_Pop, 1, 0);
- sqlite3VdbeAddOp(v, OP_Integer, -1, 0);
- sqlite3VdbeAddOp(v, OP_MustBeInt, 0, 0);
- }
-
- /* Cannot have triggers on a virtual table. If it were possible,
- ** this block would have to account for hidden column.
- */
- assert(!IsVirtual(pTab));
-
- /* Create the new column data
- */
- for(i=0; i<pTab->nCol; i++){
- if( pColumn==0 ){
- j = i;
- }else{
- for(j=0; j<pColumn->nId; j++){
- if( pColumn->a[j].idx==i ) break;
- }
- }
- if( pColumn && j>=pColumn->nId ){
- sqlite3ExprCode(pParse, pTab->aCol[i].pDflt);
- }else if( useTempTable ){
- sqlite3VdbeAddOp(v, OP_Column, srcTab, j);
- }else{
- assert( pSelect==0 ); /* Otherwise useTempTable is true */
- sqlite3ExprCodeAndCache(pParse, pList->a[j].pExpr);
- }
- }
- sqlite3VdbeAddOp(v, OP_MakeRecord, pTab->nCol, 0);
-
- /* If this is an INSERT on a view with an INSTEAD OF INSERT trigger,
- ** do not attempt any conversions before assembling the record.
- ** If this is a real table, attempt conversions as required by the
- ** table column affinities.
- */
- if( !isView ){
- sqlite3TableAffinityStr(v, pTab);
- }
- sqlite3VdbeAddOp(v, OP_Insert, newIdx, 0);
-
- /* Fire BEFORE or INSTEAD OF triggers */
- if( sqlite3CodeRowTrigger(pParse, TK_INSERT, 0, TRIGGER_BEFORE, pTab,
- newIdx, -1, onError, endOfLoop) ){
- goto insert_cleanup;
- }
- }
-
- /* If any triggers exists, the opening of tables and indices is deferred
- ** until now.
- */
- if( triggers_exist && !isView ){
- base = pParse->nTab;
- sqlite3OpenTableAndIndices(pParse, pTab, base, OP_OpenWrite);
- }
-
- /* Push the record number for the new entry onto the stack. The
- ** record number is a randomly generate integer created by NewRowid
- ** except when the table has an INTEGER PRIMARY KEY column, in which
- ** case the record number is the same as that column.
- */
- if( !isView ){
- if( IsVirtual(pTab) ){
- /* The row that the VUpdate opcode will delete: none */
- sqlite3VdbeAddOp(v, OP_Null, 0, 0);
- }
- if( keyColumn>=0 ){
- if( useTempTable ){
- sqlite3VdbeAddOp(v, OP_Column, srcTab, keyColumn);
- }else if( pSelect ){
- sqlite3VdbeAddOp(v, OP_Dup, nColumn - keyColumn - 1, 1);
- }else{
- VdbeOp *pOp;
- sqlite3ExprCode(pParse, pList->a[keyColumn].pExpr);
- pOp = sqlite3VdbeGetOp(v, sqlite3VdbeCurrentAddr(v) - 1);
- if( pOp && pOp->opcode==OP_Null ){
- appendFlag = 1;
- pOp->opcode = OP_NewRowid;
- pOp->p1 = base;
- pOp->p2 = counterMem;
- }
- }
- /* If the PRIMARY KEY expression is NULL, then use OP_NewRowid
- ** to generate a unique primary key value.
- */
- if( !appendFlag ){
- sqlite3VdbeAddOp(v, OP_NotNull, -1, sqlite3VdbeCurrentAddr(v)+3);
- sqlite3VdbeAddOp(v, OP_Pop, 1, 0);
- sqlite3VdbeAddOp(v, OP_NewRowid, base, counterMem);
- sqlite3VdbeAddOp(v, OP_MustBeInt, 0, 0);
- }
- }else if( IsVirtual(pTab) ){
- sqlite3VdbeAddOp(v, OP_Null, 0, 0);
- }else{
- sqlite3VdbeAddOp(v, OP_NewRowid, base, counterMem);
- appendFlag = 1;
- }
- autoIncStep(pParse, counterMem);
-
- /* Push onto the stack, data for all columns of the new entry, beginning
- ** with the first column.
- */
- nHidden = 0;
- for(i=0; i<pTab->nCol; i++){
- if( i==pTab->iPKey ){
- /* The value of the INTEGER PRIMARY KEY column is always a NULL.
- ** Whenever this column is read, the record number will be substituted
- ** in its place. So will fill this column with a NULL to avoid
- ** taking up data space with information that will never be used. */
- sqlite3VdbeAddOp(v, OP_Null, 0, 0);
- continue;
- }
- if( pColumn==0 ){
- if( IsHiddenColumn(&pTab->aCol[i]) ){
- assert( IsVirtual(pTab) );
- j = -1;
- nHidden++;
- }else{
- j = i - nHidden;
- }
- }else{
- for(j=0; j<pColumn->nId; j++){
- if( pColumn->a[j].idx==i ) break;
- }
- }
- if( j<0 || nColumn==0 || (pColumn && j>=pColumn->nId) ){
- sqlite3ExprCode(pParse, pTab->aCol[i].pDflt);
- }else if( useTempTable ){
- sqlite3VdbeAddOp(v, OP_Column, srcTab, j);
- }else if( pSelect ){
- sqlite3VdbeAddOp(v, OP_Dup, i+nColumn-j+IsVirtual(pTab), 1);
- }else{
- sqlite3ExprCode(pParse, pList->a[j].pExpr);
- }
- }
-
- /* Generate code to check constraints and generate index keys and
- ** do the insertion.
- */
-#ifndef SQLITE_OMIT_VIRTUALTABLE
- if( IsVirtual(pTab) ){
- pParse->pVirtualLock = pTab;
- sqlite3VdbeOp3(v, OP_VUpdate, 1, pTab->nCol+2,
- (const char*)pTab->pVtab, P3_VTAB);
- }else
-#endif
- {
- sqlite3GenerateConstraintChecks(pParse, pTab, base, 0, keyColumn>=0,
- 0, onError, endOfLoop);
- sqlite3CompleteInsertion(pParse, pTab, base, 0,0,0,
- (triggers_exist & TRIGGER_AFTER)!=0 ? newIdx : -1,
- appendFlag);
- }
- }
-
- /* Update the count of rows that are inserted
- */
- if( (db->flags & SQLITE_CountRows)!=0 ){
- sqlite3VdbeAddOp(v, OP_MemIncr, 1, iCntMem);
- }
-
- if( triggers_exist ){
- /* Close all tables opened */
- if( !isView ){
- sqlite3VdbeAddOp(v, OP_Close, base, 0);
- for(idx=1, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, idx++){
- sqlite3VdbeAddOp(v, OP_Close, idx+base, 0);
- }
- }
-
- /* Code AFTER triggers */
- if( sqlite3CodeRowTrigger(pParse, TK_INSERT, 0, TRIGGER_AFTER, pTab,
- newIdx, -1, onError, endOfLoop) ){
- goto insert_cleanup;
- }
- }
-
- /* The bottom of the loop, if the data source is a SELECT statement
- */
- sqlite3VdbeResolveLabel(v, endOfLoop);
- if( useTempTable ){
- sqlite3VdbeAddOp(v, OP_Next, srcTab, iCont);
- sqlite3VdbeResolveLabel(v, iBreak);
- sqlite3VdbeAddOp(v, OP_Close, srcTab, 0);
- }else if( pSelect ){
- sqlite3VdbeAddOp(v, OP_Pop, nColumn, 0);
- sqlite3VdbeAddOp(v, OP_Return, 0, 0);
- sqlite3VdbeResolveLabel(v, iCleanup);
- }
-
- if( !triggers_exist && !IsVirtual(pTab) ){
- /* Close all tables opened */
- sqlite3VdbeAddOp(v, OP_Close, base, 0);
- for(idx=1, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, idx++){
- sqlite3VdbeAddOp(v, OP_Close, idx+base, 0);
- }
- }
-
- /* Update the sqlite_sequence table by storing the content of the
- ** counter value in memory counterMem back into the sqlite_sequence
- ** table.
- */
- autoIncEnd(pParse, iDb, pTab, counterMem);
-
- /*
- ** Return the number of rows inserted. If this routine is
- ** generating code because of a call to sqlite3NestedParse(), do not
- ** invoke the callback function.
- */
- if( db->flags & SQLITE_CountRows && pParse->nested==0 && !pParse->trigStack ){
- sqlite3VdbeAddOp(v, OP_MemLoad, iCntMem, 0);
- sqlite3VdbeAddOp(v, OP_Callback, 1, 0);
- sqlite3VdbeSetNumCols(v, 1);
- sqlite3VdbeSetColName(v, 0, COLNAME_NAME, "rows inserted", P3_STATIC);
- }
-
-insert_cleanup:
- sqlite3SrcListDelete(pTabList);
- sqlite3ExprListDelete(pList);
- sqlite3SelectDelete(pSelect);
- sqlite3IdListDelete(pColumn);
-}
-
-/*
-** Generate code to do a constraint check prior to an INSERT or an UPDATE.
-**
-** When this routine is called, the stack contains (from bottom to top)
-** the following values:
-**
-** 1. The rowid of the row to be updated before the update. This
-** value is omitted unless we are doing an UPDATE that involves a
-** change to the record number.
-**
-** 2. The rowid of the row after the update.
-**
-** 3. The data in the first column of the entry after the update.
-**
-** i. Data from middle columns...
-**
-** N. The data in the last column of the entry after the update.
-**
-** The old rowid shown as entry (1) above is omitted unless both isUpdate
-** and rowidChng are 1. isUpdate is true for UPDATEs and false for
-** INSERTs and rowidChng is true if the record number is being changed.
-**
-** The code generated by this routine pushes additional entries onto
-** the stack which are the keys for new index entries for the new record.
-** The order of index keys is the same as the order of the indices on
-** the pTable->pIndex list. A key is only created for index i if
-** aIdxUsed!=0 and aIdxUsed[i]!=0.
-**
-** This routine also generates code to check constraints. NOT NULL,
-** CHECK, and UNIQUE constraints are all checked. If a constraint fails,
-** then the appropriate action is performed. There are five possible
-** actions: ROLLBACK, ABORT, FAIL, REPLACE, and IGNORE.
-**
-** Constraint type Action What Happens
-** --------------- ---------- ----------------------------------------
-** any ROLLBACK The current transaction is rolled back and
-** sqlite3_exec() returns immediately with a
-** return code of SQLITE_CONSTRAINT.
-**
-** any ABORT Back out changes from the current command
-** only (do not do a complete rollback) then
-** cause sqlite3_exec() to return immediately
-** with SQLITE_CONSTRAINT.
-**
-** any FAIL Sqlite_exec() returns immediately with a
-** return code of SQLITE_CONSTRAINT. The
-** transaction is not rolled back and any
-** prior changes are retained.
-**
-** any IGNORE The record number and data is popped from
-** the stack and there is an immediate jump
-** to label ignoreDest.
-**
-** NOT NULL REPLACE The NULL value is replace by the default
-** value for that column. If the default value
-** is NULL, the action is the same as ABORT.
-**
-** UNIQUE REPLACE The other row that conflicts with the row
-** being inserted is removed.
-**
-** CHECK REPLACE Illegal. The results in an exception.
-**
-** Which action to take is determined by the overrideError parameter.
-** Or if overrideError==OE_Default, then the pParse->onError parameter
-** is used. Or if pParse->onError==OE_Default then the onError value
-** for the constraint is used.
-**
-** The calling routine must open a read/write cursor for pTab with
-** cursor number "base". All indices of pTab must also have open
-** read/write cursors with cursor number base+i for the i-th cursor.
-** Except, if there is no possibility of a REPLACE action then
-** cursors do not need to be open for indices where aIdxUsed[i]==0.
-**
-** If the isUpdate flag is true, it means that the "base" cursor is
-** initially pointing to an entry that is being updated. The isUpdate
-** flag causes extra code to be generated so that the "base" cursor
-** is still pointing at the same entry after the routine returns.
-** Without the isUpdate flag, the "base" cursor might be moved.
-*/
-void sqlite3GenerateConstraintChecks(
- Parse *pParse, /* The parser context */
- Table *pTab, /* the table into which we are inserting */
- int base, /* Index of a read/write cursor pointing at pTab */
- char *aIdxUsed, /* Which indices are used. NULL means all are used */
- int rowidChng, /* True if the record number will change */
- int isUpdate, /* True for UPDATE, False for INSERT */
- int overrideError, /* Override onError to this if not OE_Default */
- int ignoreDest /* Jump to this label on an OE_Ignore resolution */
-){
- int i;
- Vdbe *v;
- int nCol;
- int onError;
- int addr;
- int extra;
- int iCur;
- Index *pIdx;
- int seenReplace = 0;
- int jumpInst1=0, jumpInst2;
- int hasTwoRowids = (isUpdate && rowidChng);
-
- v = sqlite3GetVdbe(pParse);
- assert( v!=0 );
- assert( pTab->pSelect==0 ); /* This table is not a VIEW */
- nCol = pTab->nCol;
-
- /* Test all NOT NULL constraints.
- */
- for(i=0; i<nCol; i++){
- if( i==pTab->iPKey ){
- continue;
- }
- onError = pTab->aCol[i].notNull;
- if( onError==OE_None ) continue;
- if( overrideError!=OE_Default ){
- onError = overrideError;
- }else if( onError==OE_Default ){
- onError = OE_Abort;
- }
- if( onError==OE_Replace && pTab->aCol[i].pDflt==0 ){
- onError = OE_Abort;
- }
- sqlite3VdbeAddOp(v, OP_Dup, nCol-1-i, 1);
- addr = sqlite3VdbeAddOp(v, OP_NotNull, 1, 0);
- assert( onError==OE_Rollback || onError==OE_Abort || onError==OE_Fail
- || onError==OE_Ignore || onError==OE_Replace );
- switch( onError ){
- case OE_Rollback:
- case OE_Abort:
- case OE_Fail: {
- char *zMsg = 0;
- sqlite3VdbeAddOp(v, OP_Halt, SQLITE_CONSTRAINT, onError);
- sqlite3SetString(&zMsg, pTab->zName, ".", pTab->aCol[i].zName,
- " may not be NULL", (char*)0);
- sqlite3VdbeChangeP3(v, -1, zMsg, P3_DYNAMIC);
- break;
- }
- case OE_Ignore: {
- sqlite3VdbeAddOp(v, OP_Pop, nCol+1+hasTwoRowids, 0);
- sqlite3VdbeAddOp(v, OP_Goto, 0, ignoreDest);
- break;
- }
- case OE_Replace: {
- sqlite3ExprCode(pParse, pTab->aCol[i].pDflt);
- sqlite3VdbeAddOp(v, OP_Push, nCol-i, 0);
- break;
- }
- }
- sqlite3VdbeJumpHere(v, addr);
- }
-
- /* Test all CHECK constraints
- */
-#ifndef SQLITE_OMIT_CHECK
- if( pTab->pCheck && (pParse->db->flags & SQLITE_IgnoreChecks)==0 ){
- int allOk = sqlite3VdbeMakeLabel(v);
- assert( pParse->ckOffset==0 );
- pParse->ckOffset = nCol;
- sqlite3ExprIfTrue(pParse, pTab->pCheck, allOk, 1);
- assert( pParse->ckOffset==nCol );
- pParse->ckOffset = 0;
- onError = overrideError!=OE_Default ? overrideError : OE_Abort;
- if( onError==OE_Ignore ){
- sqlite3VdbeAddOp(v, OP_Pop, nCol+1+hasTwoRowids, 0);
- sqlite3VdbeAddOp(v, OP_Goto, 0, ignoreDest);
- }else{
- sqlite3VdbeAddOp(v, OP_Halt, SQLITE_CONSTRAINT, onError);
- }
- sqlite3VdbeResolveLabel(v, allOk);
- }
-#endif /* !defined(SQLITE_OMIT_CHECK) */
-
- /* If we have an INTEGER PRIMARY KEY, make sure the primary key
- ** of the new record does not previously exist. Except, if this
- ** is an UPDATE and the primary key is not changing, that is OK.
- */
- if( rowidChng ){
- onError = pTab->keyConf;
- if( overrideError!=OE_Default ){
- onError = overrideError;
- }else if( onError==OE_Default ){
- onError = OE_Abort;
- }
-
- if( isUpdate ){
- sqlite3VdbeAddOp(v, OP_Dup, nCol+1, 1);
- sqlite3VdbeAddOp(v, OP_Dup, nCol+1, 1);
- jumpInst1 = sqlite3VdbeAddOp(v, OP_Eq, 0, 0);
- }
- sqlite3VdbeAddOp(v, OP_Dup, nCol, 1);
- jumpInst2 = sqlite3VdbeAddOp(v, OP_NotExists, base, 0);
- switch( onError ){
- default: {
- onError = OE_Abort;
- /* Fall thru into the next case */
- }
- case OE_Rollback:
- case OE_Abort:
- case OE_Fail: {
- sqlite3VdbeOp3(v, OP_Halt, SQLITE_CONSTRAINT, onError,
- "PRIMARY KEY must be unique", P3_STATIC);
- break;
- }
- case OE_Replace: {
- sqlite3GenerateRowIndexDelete(v, pTab, base, 0);
- if( isUpdate ){
- sqlite3VdbeAddOp(v, OP_Dup, nCol+hasTwoRowids, 1);
- sqlite3VdbeAddOp(v, OP_MoveGe, base, 0);
- }
- seenReplace = 1;
- break;
- }
- case OE_Ignore: {
- assert( seenReplace==0 );
- sqlite3VdbeAddOp(v, OP_Pop, nCol+1+hasTwoRowids, 0);
- sqlite3VdbeAddOp(v, OP_Goto, 0, ignoreDest);
- break;
- }
- }
- sqlite3VdbeJumpHere(v, jumpInst2);
- if( isUpdate ){
- sqlite3VdbeJumpHere(v, jumpInst1);
- sqlite3VdbeAddOp(v, OP_Dup, nCol+1, 1);
- sqlite3VdbeAddOp(v, OP_MoveGe, base, 0);
- }
- }
-
- /* Test all UNIQUE constraints by creating entries for each UNIQUE
- ** index and making sure that duplicate entries do not already exist.
- ** Add the new records to the indices as we go.
- */
- extra = -1;
- for(iCur=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, iCur++){
- if( aIdxUsed && aIdxUsed[iCur]==0 ) continue; /* Skip unused indices */
- extra++;
-
- /* Create a key for accessing the index entry */
- sqlite3VdbeAddOp(v, OP_Dup, nCol+extra, 1);
- for(i=0; i<pIdx->nColumn; i++){
- int idx = pIdx->aiColumn[i];
- if( idx==pTab->iPKey ){
- sqlite3VdbeAddOp(v, OP_Dup, i+extra+nCol+1, 1);
- }else{
- sqlite3VdbeAddOp(v, OP_Dup, i+extra+nCol-idx, 1);
- }
- }
- jumpInst1 = sqlite3VdbeAddOp(v, OP_MakeIdxRec, pIdx->nColumn, 0);
- sqlite3IndexAffinityStr(v, pIdx);
-
- /* Find out what action to take in case there is an indexing conflict */
- onError = pIdx->onError;
- if( onError==OE_None ) continue; /* pIdx is not a UNIQUE index */
- if( overrideError!=OE_Default ){
- onError = overrideError;
- }else if( onError==OE_Default ){
- onError = OE_Abort;
- }
- if( seenReplace ){
- if( onError==OE_Ignore ) onError = OE_Replace;
- else if( onError==OE_Fail ) onError = OE_Abort;
- }
-
-
- /* Check to see if the new index entry will be unique */
- sqlite3VdbeAddOp(v, OP_Dup, extra+nCol+1+hasTwoRowids, 1);
- jumpInst2 = sqlite3VdbeAddOp(v, OP_IsUnique, base+iCur+1, 0);
-
- /* Generate code that executes if the new index entry is not unique */
- assert( onError==OE_Rollback || onError==OE_Abort || onError==OE_Fail
- || onError==OE_Ignore || onError==OE_Replace );
- switch( onError ){
- case OE_Rollback:
- case OE_Abort:
- case OE_Fail: {
- int j, n1, n2;
- char zErrMsg[200];
- sqlite3_snprintf(sizeof(zErrMsg), zErrMsg,
- pIdx->nColumn>1 ? "columns " : "column ");
- n1 = strlen(zErrMsg);
- for(j=0; j<pIdx->nColumn && n1<sizeof(zErrMsg)-30; j++){
- char *zCol = pTab->aCol[pIdx->aiColumn[j]].zName;
- n2 = strlen(zCol);
- if( j>0 ){
- sqlite3_snprintf(sizeof(zErrMsg)-n1, &zErrMsg[n1], ", ");
- n1 += 2;
- }
- if( n1+n2>sizeof(zErrMsg)-30 ){
- sqlite3_snprintf(sizeof(zErrMsg)-n1, &zErrMsg[n1], "...");
- n1 += 3;
- break;
- }else{
- sqlite3_snprintf(sizeof(zErrMsg)-n1, &zErrMsg[n1], "%s", zCol);
- n1 += n2;
- }
- }
- sqlite3_snprintf(sizeof(zErrMsg)-n1, &zErrMsg[n1],
- pIdx->nColumn>1 ? " are not unique" : " is not unique");
- sqlite3VdbeOp3(v, OP_Halt, SQLITE_CONSTRAINT, onError, zErrMsg, 0);
- break;
- }
- case OE_Ignore: {
- assert( seenReplace==0 );
- sqlite3VdbeAddOp(v, OP_Pop, nCol+extra+3+hasTwoRowids, 0);
- sqlite3VdbeAddOp(v, OP_Goto, 0, ignoreDest);
- break;
- }
- case OE_Replace: {
- sqlite3GenerateRowDelete(pParse->db, v, pTab, base, 0);
- if( isUpdate ){
- sqlite3VdbeAddOp(v, OP_Dup, nCol+extra+1+hasTwoRowids, 1);
- sqlite3VdbeAddOp(v, OP_MoveGe, base, 0);
- }
- seenReplace = 1;
- break;
- }
- }
-#if NULL_DISTINCT_FOR_UNIQUE
- sqlite3VdbeJumpHere(v, jumpInst1);
-#endif
- sqlite3VdbeJumpHere(v, jumpInst2);
- }
-}
-
-/*
-** This routine generates code to finish the INSERT or UPDATE operation
-** that was started by a prior call to sqlite3GenerateConstraintChecks.
-** The stack must contain keys for all active indices followed by data
-** and the rowid for the new entry. This routine creates the new
-** entries in all indices and in the main table.
-**
-** The arguments to this routine should be the same as the first six
-** arguments to sqlite3GenerateConstraintChecks.
-*/
-void sqlite3CompleteInsertion(
- Parse *pParse, /* The parser context */
- Table *pTab, /* the table into which we are inserting */
- int base, /* Index of a read/write cursor pointing at pTab */
- char *aIdxUsed, /* Which indices are used. NULL means all are used */
- int rowidChng, /* True if the record number will change */
- int isUpdate, /* True for UPDATE, False for INSERT */
- int newIdx, /* Index of NEW table for triggers. -1 if none */
- int appendBias /* True if this is likely to be an append */
-){
- int i;
- Vdbe *v;
- int nIdx;
- Index *pIdx;
- int pik_flags;
-
- v = sqlite3GetVdbe(pParse);
- assert( v!=0 );
- assert( pTab->pSelect==0 ); /* This table is not a VIEW */
- for(nIdx=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, nIdx++){}
- for(i=nIdx-1; i>=0; i--){
- if( aIdxUsed && aIdxUsed[i]==0 ) continue;
- sqlite3VdbeAddOp(v, OP_IdxInsert, base+i+1, 0);
- }
- sqlite3VdbeAddOp(v, OP_MakeRecord, pTab->nCol, 0);
- sqlite3TableAffinityStr(v, pTab);
-#ifndef SQLITE_OMIT_TRIGGER
- if( newIdx>=0 ){
- sqlite3VdbeAddOp(v, OP_Dup, 1, 0);
- sqlite3VdbeAddOp(v, OP_Dup, 1, 0);
- sqlite3VdbeAddOp(v, OP_Insert, newIdx, 0);
- }
-#endif
- if( pParse->nested ){
- pik_flags = 0;
- }else{
- pik_flags = OPFLAG_NCHANGE;
- pik_flags |= (isUpdate?OPFLAG_ISUPDATE:OPFLAG_LASTROWID);
- }
- if( appendBias ){
- pik_flags |= OPFLAG_APPEND;
- }
- sqlite3VdbeAddOp(v, OP_Insert, base, pik_flags);
- if( !pParse->nested ){
- sqlite3VdbeChangeP3(v, -1, pTab->zName, P3_STATIC);
- }
-
- if( isUpdate && rowidChng ){
- sqlite3VdbeAddOp(v, OP_Pop, 1, 0);
- }
-}
-
-/*
-** Generate code that will open cursors for a table and for all
-** indices of that table. The "base" parameter is the cursor number used
-** for the table. Indices are opened on subsequent cursors.
-*/
-void sqlite3OpenTableAndIndices(
- Parse *pParse, /* Parsing context */
- Table *pTab, /* Table to be opened */
- int base, /* Cursor number assigned to the table */
- int op /* OP_OpenRead or OP_OpenWrite */
-){
- int i;
- int iDb;
- Index *pIdx;
- Vdbe *v;
-
- if( IsVirtual(pTab) ) return;
- iDb = sqlite3SchemaToIndex(pParse->db, pTab->pSchema);
- v = sqlite3GetVdbe(pParse);
- assert( v!=0 );
- sqlite3OpenTable(pParse, base, iDb, pTab, op);
- for(i=1, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, i++){
- KeyInfo *pKey = sqlite3IndexKeyinfo(pParse, pIdx);
- assert( pIdx->pSchema==pTab->pSchema );
- sqlite3VdbeAddOp(v, OP_Integer, iDb, 0);
- VdbeComment((v, "# %s", pIdx->zName));
- sqlite3VdbeOp3(v, op, i+base, pIdx->tnum, (char*)pKey, P3_KEYINFO_HANDOFF);
- }
- if( pParse->nTab<=base+i ){
- pParse->nTab = base+i;
- }
-}
-
-
-#ifdef SQLITE_TEST
-/*
-** The following global variable is incremented whenever the
-** transfer optimization is used. This is used for testing
-** purposes only - to make sure the transfer optimization really
-** is happening when it is suppose to.
-*/
-int sqlite3_xferopt_count;
-#endif /* SQLITE_TEST */
-
-
-#ifndef SQLITE_OMIT_XFER_OPT
-/*
-** Check to collation names to see if they are compatible.
-*/
-static int xferCompatibleCollation(const char *z1, const char *z2){
- if( z1==0 ){
- return z2==0;
- }
- if( z2==0 ){
- return 0;
- }
- return sqlite3StrICmp(z1, z2)==0;
-}
-
-
-/*
-** Check to see if index pSrc is compatible as a source of data
-** for index pDest in an insert transfer optimization. The rules
-** for a compatible index:
-**
-** * The index is over the same set of columns
-** * The same DESC and ASC markings occurs on all columns
-** * The same onError processing (OE_Abort, OE_Ignore, etc)
-** * The same collating sequence on each column
-*/
-static int xferCompatibleIndex(Index *pDest, Index *pSrc){
- int i;
- assert( pDest && pSrc );
- assert( pDest->pTable!=pSrc->pTable );
- if( pDest->nColumn!=pSrc->nColumn ){
- return 0; /* Different number of columns */
- }
- if( pDest->onError!=pSrc->onError ){
- return 0; /* Different conflict resolution strategies */
- }
- for(i=0; i<pSrc->nColumn; i++){
- if( pSrc->aiColumn[i]!=pDest->aiColumn[i] ){
- return 0; /* Different columns indexed */
- }
- if( pSrc->aSortOrder[i]!=pDest->aSortOrder[i] ){
- return 0; /* Different sort orders */
- }
- if( pSrc->azColl[i]!=pDest->azColl[i] ){
- return 0; /* Different sort orders */
- }
- }
-
- /* If no test above fails then the indices must be compatible */
- return 1;
-}
-
-/*
-** Attempt the transfer optimization on INSERTs of the form
-**
-** INSERT INTO tab1 SELECT * FROM tab2;
-**
-** This optimization is only attempted if
-**
-** (1) tab1 and tab2 have identical schemas including all the
-** same indices and constraints
-**
-** (2) tab1 and tab2 are different tables
-**
-** (3) There must be no triggers on tab1
-**
-** (4) The result set of the SELECT statement is "*"
-**
-** (5) The SELECT statement has no WHERE, HAVING, ORDER BY, GROUP BY,
-** or LIMIT clause.
-**
-** (6) The SELECT statement is a simple (not a compound) select that
-** contains only tab2 in its FROM clause
-**
-** This method for implementing the INSERT transfers raw records from
-** tab2 over to tab1. The columns are not decoded. Raw records from
-** the indices of tab2 are transfered to tab1 as well. In so doing,
-** the resulting tab1 has much less fragmentation.
-**
-** This routine returns TRUE if the optimization is attempted. If any
-** of the conditions above fail so that the optimization should not
-** be attempted, then this routine returns FALSE.
-*/
-static int xferOptimization(
- Parse *pParse, /* Parser context */
- Table *pDest, /* The table we are inserting into */
- Select *pSelect, /* A SELECT statement to use as the data source */
- int onError, /* How to handle constraint errors */
- int iDbDest /* The database of pDest */
-){
- ExprList *pEList; /* The result set of the SELECT */
- Table *pSrc; /* The table in the FROM clause of SELECT */
- Index *pSrcIdx, *pDestIdx; /* Source and destination indices */
- SrcList::SrcList_item *pItem; /* An element of pSelect->pSrc */
- int i; /* Loop counter */
- int iDbSrc; /* The database of pSrc */
- int iSrc, iDest; /* Cursors from source and destination */
- int addr1, addr2; /* Loop addresses */
- int emptyDestTest; /* Address of test for empty pDest */
- int emptySrcTest; /* Address of test for empty pSrc */
- Vdbe *v; /* The VDBE we are building */
- KeyInfo *pKey; /* Key information for an index */
- int counterMem; /* Memory register used by AUTOINC */
- int destHasUniqueIdx = 0; /* True if pDest has a UNIQUE index */
-
- if( pSelect==0 ){
- return 0; /* Must be of the form INSERT INTO ... SELECT ... */
- }
- if( pDest->pTrigger ){
- return 0; /* tab1 must not have triggers */
- }
-#ifndef SQLITE_OMIT_VIRTUALTABLE
- if( pDest->isVirtual ){
- return 0; /* tab1 must not be a virtual table */
- }
-#endif
- if( onError==OE_Default ){
- onError = OE_Abort;
- }
- if( onError!=OE_Abort && onError!=OE_Rollback ){
- return 0; /* Cannot do OR REPLACE or OR IGNORE or OR FAIL */
- }
- assert(pSelect->pSrc); /* allocated even if there is no FROM clause */
- if( pSelect->pSrc->nSrc!=1 ){
- return 0; /* FROM clause must have exactly one term */
- }
- if( pSelect->pSrc->a[0].pSelect ){
- return 0; /* FROM clause cannot contain a subquery */
- }
- if( pSelect->pWhere ){
- return 0; /* SELECT may not have a WHERE clause */
- }
- if( pSelect->pOrderBy ){
- return 0; /* SELECT may not have an ORDER BY clause */
- }
- /* Do not need to test for a HAVING clause. If HAVING is present but
- ** there is no ORDER BY, we will get an error. */
- if( pSelect->pGroupBy ){
- return 0; /* SELECT may not have a GROUP BY clause */
- }
- if( pSelect->pLimit ){
- return 0; /* SELECT may not have a LIMIT clause */
- }
- assert( pSelect->pOffset==0 ); /* Must be so if pLimit==0 */
- if( pSelect->pPrior ){
- return 0; /* SELECT may not be a compound query */
- }
- if( pSelect->isDistinct ){
- return 0; /* SELECT may not be DISTINCT */
- }
- pEList = pSelect->pEList;
- assert( pEList!=0 );
- if( pEList->nExpr!=1 ){
- return 0; /* The result set must have exactly one column */
- }
- assert( pEList->a[0].pExpr );
- if( pEList->a[0].pExpr->op!=TK_ALL ){
- return 0; /* The result set must be the special operator "*" */
- }
-
- /* At this point we have established that the statement is of the
- ** correct syntactic form to participate in this optimization. Now
- ** we have to check the semantics.
- */
- pItem = pSelect->pSrc->a;
- pSrc = sqlite3LocateTable(pParse, pItem->zName, pItem->zDatabase);
- if( pSrc==0 ){
- return 0; /* FROM clause does not contain a real table */
- }
- if( pSrc==pDest ){
- return 0; /* tab1 and tab2 may not be the same table */
- }
-#ifndef SQLITE_OMIT_VIRTUALTABLE
- if( pSrc->isVirtual ){
- return 0; /* tab2 must not be a virtual table */
- }
-#endif
- if( pSrc->pSelect ){
- return 0; /* tab2 may not be a view */
- }
- if( pDest->nCol!=pSrc->nCol ){
- return 0; /* Number of columns must be the same in tab1 and tab2 */
- }
- if( pDest->iPKey!=pSrc->iPKey ){
- return 0; /* Both tables must have the same INTEGER PRIMARY KEY */
- }
- for(i=0; i<pDest->nCol; i++){
- if( pDest->aCol[i].affinity!=pSrc->aCol[i].affinity ){
- return 0; /* Affinity must be the same on all columns */
- }
- if( !xferCompatibleCollation(pDest->aCol[i].zColl, pSrc->aCol[i].zColl) ){
- return 0; /* Collating sequence must be the same on all columns */
- }
- if( pDest->aCol[i].notNull && !pSrc->aCol[i].notNull ){
- return 0; /* tab2 must be NOT NULL if tab1 is */
- }
- }
- for(pDestIdx=pDest->pIndex; pDestIdx; pDestIdx=pDestIdx->pNext){
- if( pDestIdx->onError!=OE_None ){
- destHasUniqueIdx = 1;
- }
- for(pSrcIdx=pSrc->pIndex; pSrcIdx; pSrcIdx=pSrcIdx->pNext){
- if( xferCompatibleIndex(pDestIdx, pSrcIdx) ) break;
- }
- if( pSrcIdx==0 ){
- return 0; /* pDestIdx has no corresponding index in pSrc */
- }
- }
-#ifndef SQLITE_OMIT_CHECK
- if( pDest->pCheck && !sqlite3ExprCompare(pSrc->pCheck, pDest->pCheck) ){
- return 0; /* Tables have different CHECK constraints. Ticket #2252 */
- }
-#endif
-
- /* If we get this far, it means either:
- **
- ** * We can always do the transfer if the table contains an
- ** an integer primary key
- **
- ** * We can conditionally do the transfer if the destination
- ** table is empty.
- */
-#ifdef SQLITE_TEST
- sqlite3_xferopt_count++;
-#endif
- iDbSrc = sqlite3SchemaToIndex(pParse->db, pSrc->pSchema);
- v = sqlite3GetVdbe(pParse);
- sqlite3CodeVerifySchema(pParse, iDbSrc);
- iSrc = pParse->nTab++;
- iDest = pParse->nTab++;
- counterMem = autoIncBegin(pParse, iDbDest, pDest);
- sqlite3OpenTable(pParse, iDest, iDbDest, pDest, OP_OpenWrite);
- if( (pDest->iPKey<0 && pDest->pIndex!=0) || destHasUniqueIdx ){
- /* If tables do not have an INTEGER PRIMARY KEY and there
- ** are indices to be copied and the destination is not empty,
- ** we have to disallow the transfer optimization because the
- ** the rowids might change which will mess up indexing.
- **
- ** Or if the destination has a UNIQUE index and is not empty,
- ** we also disallow the transfer optimization because we cannot
- ** insure that all entries in the union of DEST and SRC will be
- ** unique.
- */
- addr1 = sqlite3VdbeAddOp(v, OP_Rewind, iDest, 0);
- emptyDestTest = sqlite3VdbeAddOp(v, OP_Goto, 0, 0);
- sqlite3VdbeJumpHere(v, addr1);
- }else{
- emptyDestTest = 0;
- }
- sqlite3OpenTable(pParse, iSrc, iDbSrc, pSrc, OP_OpenRead);
- emptySrcTest = sqlite3VdbeAddOp(v, OP_Rewind, iSrc, 0);
- if( pDest->iPKey>=0 ){
- addr1 = sqlite3VdbeAddOp(v, OP_Rowid, iSrc, 0);
- sqlite3VdbeAddOp(v, OP_Dup, 0, 0);
- addr2 = sqlite3VdbeAddOp(v, OP_NotExists, iDest, 0);
- sqlite3VdbeOp3(v, OP_Halt, SQLITE_CONSTRAINT, onError,
- "PRIMARY KEY must be unique", P3_STATIC);
- sqlite3VdbeJumpHere(v, addr2);
- autoIncStep(pParse, counterMem);
- }else if( pDest->pIndex==0 ){
- addr1 = sqlite3VdbeAddOp(v, OP_NewRowid, iDest, 0);
- }else{
- addr1 = sqlite3VdbeAddOp(v, OP_Rowid, iSrc, 0);
- assert( pDest->autoInc==0 );
- }
- sqlite3VdbeAddOp(v, OP_RowData, iSrc, 0);
- sqlite3VdbeOp3(v, OP_Insert, iDest,
- OPFLAG_NCHANGE|OPFLAG_LASTROWID|OPFLAG_APPEND,
- pDest->zName, 0);
- sqlite3VdbeAddOp(v, OP_Next, iSrc, addr1);
- autoIncEnd(pParse, iDbDest, pDest, counterMem);
- for(pDestIdx=pDest->pIndex; pDestIdx; pDestIdx=pDestIdx->pNext){
- for(pSrcIdx=pSrc->pIndex; pSrcIdx; pSrcIdx=pSrcIdx->pNext){
- if( xferCompatibleIndex(pDestIdx, pSrcIdx) ) break;
- }
- assert( pSrcIdx );
- sqlite3VdbeAddOp(v, OP_Close, iSrc, 0);
- sqlite3VdbeAddOp(v, OP_Close, iDest, 0);
- sqlite3VdbeAddOp(v, OP_Integer, iDbSrc, 0);
- pKey = sqlite3IndexKeyinfo(pParse, pSrcIdx);
- VdbeComment((v, "# %s", pSrcIdx->zName));
- sqlite3VdbeOp3(v, OP_OpenRead, iSrc, pSrcIdx->tnum,
- (char*)pKey, P3_KEYINFO_HANDOFF);
- sqlite3VdbeAddOp(v, OP_Integer, iDbDest, 0);
- pKey = sqlite3IndexKeyinfo(pParse, pDestIdx);
- VdbeComment((v, "# %s", pDestIdx->zName));
- sqlite3VdbeOp3(v, OP_OpenWrite, iDest, pDestIdx->tnum,
- (char*)pKey, P3_KEYINFO_HANDOFF);
- addr1 = sqlite3VdbeAddOp(v, OP_Rewind, iSrc, 0);
- sqlite3VdbeAddOp(v, OP_RowKey, iSrc, 0);
- sqlite3VdbeAddOp(v, OP_IdxInsert, iDest, 1);
- sqlite3VdbeAddOp(v, OP_Next, iSrc, addr1+1);
- sqlite3VdbeJumpHere(v, addr1);
- }
- sqlite3VdbeJumpHere(v, emptySrcTest);
- sqlite3VdbeAddOp(v, OP_Close, iSrc, 0);
- sqlite3VdbeAddOp(v, OP_Close, iDest, 0);
- if( emptyDestTest ){
- sqlite3VdbeAddOp(v, OP_Halt, SQLITE_OK, 0);
- sqlite3VdbeJumpHere(v, emptyDestTest);
- sqlite3VdbeAddOp(v, OP_Close, iDest, 0);
- return 0;
- }else{
- return 1;
- }
-}
-#endif /* SQLITE_OMIT_XFER_OPT */