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<!DOCTYPE concept
  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
<concept id="GUID-BDC03973-45B0-54BD-99D1-298F4F59DB95" xml:lang="en"><title>How
to execute SQL incrementally</title><shortdesc>Describes how SQL statements are executed.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
<p>DDL and DML statements can be executed incrementally.</p>
<section id="GUID-98969CFF-05CB-44AC-B104-55BAB017FF95"><title>Incremental execution of a DDL statement</title> <p>The following
code fragment illustrates the incremental execution of a DDL statement. In
practice, this is no better than direct execution but shows the 'end conditions'
for running <codeph>RDbIncremental</codeph>.</p> <codeblock id="GUID-BC862C15-ACC4-5D29-A814-358C88116B6F" xml:space="preserve">_LIT(KTxt,"DROP TABLE Suppliers");
...
RDbIncremental op;
TInt step;
TInt r=op.Execute(database,KTxt,step);
while (step&gt;0 &amp;&amp; r==KErrNone)
    {
    r=op.Next(step);
    }
op.Close();
...
// r has the error code from the operation</codeblock> </section>
<section id="GUID-49F5A5A9-34FB-4493-BD1E-A6DA8AFC23F9"><title>Incremental execution of a DML statement</title> <p>The following
code fragment is an example of driving the incremental execution of a DML
statement to completion.</p> <codeblock id="GUID-F25A1017-B103-530C-B426-54098A696014" xml:space="preserve">_LIT(KTxt,"DELETE FROM Suppliers");
...
RDbUpdate update;
TInt r=update.Execute(database,KTxt);
while (r&gt;0)
    {
    r=op.Next();
    }
op.Close();
...
// r has the error code from the operation
// update.RowCount() returns the number of rows deleted, if successful</codeblock> </section>
</conbody></concept>