engine/sqlite/src/table.cpp
author skip
Thu, 25 Feb 2010 14:29:19 +0000
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/*
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** 2001 September 15
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**
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** The author disclaims copyright to this source code.  In place of
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** a legal notice, here is a blessing:
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**
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**    May you do good and not evil.
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**    May you find forgiveness for yourself and forgive others.
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**    May you share freely, never taking more than you give.
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**
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*************************************************************************
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** This file contains the sqlite3_get_table() and sqlite3_free_table()
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** interface routines.  These are just wrappers around the main
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** interface routine of sqlite3_exec().
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**
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** These routines are in a separate files so that they will not be linked
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** if they are not used.
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*/
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#include "sqliteInt.h"
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#include <stdlib.h>
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#include <string.h>
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#ifndef SQLITE_OMIT_GET_TABLE
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/*
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** This structure is used to pass data from sqlite3_get_table() through
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** to the callback function is uses to build the result.
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*/
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typedef struct TabResult {
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  char **azResult;
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  char *zErrMsg;
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  int nResult;
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  int nAlloc;
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  int nRow;
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  int nColumn;
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  int nData;
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  int rc;
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} TabResult;
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/*
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** This routine is called once for each row in the result table.  Its job
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** is to fill in the TabResult structure appropriately, allocating new
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** memory as necessary.
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*/
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static int sqlite3_get_table_cb(void *pArg, int nCol, char **argv, char **colv){
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  TabResult *p = (TabResult*)pArg;
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  int need;
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  int i;
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  char *z;
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  /* Make sure there is enough space in p->azResult to hold everything
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  ** we need to remember from this invocation of the callback.
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  */
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  if( p->nRow==0 && argv!=0 ){
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    need = nCol*2;
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  }else{
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    need = nCol;
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  }
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  if( p->nData + need >= p->nAlloc ){
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    char **azNew;
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    p->nAlloc = p->nAlloc*2 + need + 1;
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    azNew = (char**)sqlite3_realloc( p->azResult, sizeof(char*)*p->nAlloc );
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    if( azNew==0 ) goto malloc_failed;
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    p->azResult = azNew;
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  }
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  /* If this is the first row, then generate an extra row containing
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  ** the names of all columns.
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  */
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  if( p->nRow==0 ){
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    p->nColumn = nCol;
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    for(i=0; i<nCol; i++){
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      if( colv[i]==0 ){
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        z = sqlite3_mprintf("");
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      }else{
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        z = sqlite3_mprintf("%s", colv[i]);
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      }
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      p->azResult[p->nData++] = z;
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    }
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  }else if( p->nColumn!=nCol ){
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    sqlite3SetString(&p->zErrMsg,
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       "sqlite3_get_table() called with two or more incompatible queries",
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       (char*)0);
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    p->rc = SQLITE_ERROR;
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    return 1;
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  }
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  /* Copy over the row data
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  */
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  if( argv!=0 ){
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    for(i=0; i<nCol; i++){
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      if( argv[i]==0 ){
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        z = 0;
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      }else{
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        int n = strlen(argv[i])+1;
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        z = (char*)sqlite3_malloc( n );
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        if( z==0 ) goto malloc_failed;
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        memcpy(z, argv[i], n);
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      }
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      p->azResult[p->nData++] = z;
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    }
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    p->nRow++;
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  }
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  return 0;
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malloc_failed:
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  p->rc = SQLITE_NOMEM;
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  return 1;
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}
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/*
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** Query the database.  But instead of invoking a callback for each row,
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** malloc() for space to hold the result and return the entire results
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** at the conclusion of the call.
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**
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** The result that is written to ***pazResult is held in memory obtained
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** from malloc().  But the caller cannot free this memory directly.  
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** Instead, the entire table should be passed to sqlite3_free_table() when
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** the calling procedure is finished using it.
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*/
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EXPORT_C int sqlite3_get_table(
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  sqlite3 *db,                /* The database on which the SQL executes */
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  const char *zSql,           /* The SQL to be executed */
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  char ***pazResult,          /* Write the result table here */
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  int *pnRow,                 /* Write the number of rows in the result here */
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  int *pnColumn,              /* Write the number of columns of result here */
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  char **pzErrMsg             /* Write error messages here */
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){
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  int rc;
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  TabResult res;
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  if( pazResult==0 ){ return SQLITE_ERROR; }
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  *pazResult = 0;
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  if( pnColumn ) *pnColumn = 0;
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  if( pnRow ) *pnRow = 0;
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  res.zErrMsg = 0;
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  res.nResult = 0;
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  res.nRow = 0;
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  res.nColumn = 0;
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  res.nData = 1;
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  res.nAlloc = 20;
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  res.rc = SQLITE_OK;
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  res.azResult = (char**)sqlite3_malloc( sizeof(char*)*res.nAlloc );
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  if( res.azResult==0 ) return SQLITE_NOMEM;
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  res.azResult[0] = 0;
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  rc = sqlite3_exec(db, zSql, sqlite3_get_table_cb, &res, pzErrMsg);
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#ifndef NDEBUG
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  sqlite3_mutex_enter(db->mutex);
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  assert((rc&db->errMask)==rc && (res.rc&db->errMask)==res.rc);
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  sqlite3_mutex_leave(db->mutex);
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#endif
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  if( res.azResult ){
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    assert( sizeof(res.azResult[0])>= sizeof(res.nData) );
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    res.azResult[0] = (char*)res.nData;
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  }
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  if( (rc&0xff)==SQLITE_ABORT ){
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    sqlite3_free_table(&res.azResult[1]);
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    if( res.zErrMsg ){
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      if( pzErrMsg ){
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        sqlite3_free(*pzErrMsg);
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        *pzErrMsg = sqlite3_mprintf("%s",res.zErrMsg);
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      }
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      sqlite3_free(res.zErrMsg);
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    }
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    sqlite3_mutex_enter(db->mutex);
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    db->errCode = res.rc;
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    sqlite3_mutex_leave(db->mutex);
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    return res.rc;
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  }
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  sqlite3_free(res.zErrMsg);
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  if( rc!=SQLITE_OK ){
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    sqlite3_free_table(&res.azResult[1]);
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    return rc;
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  }
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  if( res.nAlloc>res.nData ){
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    char **azNew;
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    azNew = (char**)sqlite3_realloc( res.azResult, sizeof(char*)*(res.nData+1) );
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    if( azNew==0 ){
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      sqlite3_free_table(&res.azResult[1]);
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      return SQLITE_NOMEM;
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    }
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    res.nAlloc = res.nData+1;
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    res.azResult = azNew;
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  }
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  *pazResult = &res.azResult[1];
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  if( pnColumn ) *pnColumn = res.nColumn;
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  if( pnRow ) *pnRow = res.nRow;
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  return rc;
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}
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/*
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** This routine frees the space the sqlite3_get_table() malloced.
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*/
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EXPORT_C void sqlite3_free_table(
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  char **azResult            /* Result returned from from sqlite3_get_table() */
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){
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  if( azResult ){
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    int i, n;
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    azResult--;
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    if( azResult==0 ) return;
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    n = (int)azResult[0];
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    for(i=1; i<n; i++){ if( azResult[i] ) sqlite3_free(azResult[i]); }
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    sqlite3_free(azResult);
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  }
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}
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#endif /* SQLITE_OMIT_GET_TABLE */