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<concept xml:lang="en" id="GUID-BDC03973-45B0-54BD-99D1-298F4F59DB95"><title>How to execute SQL incrementally</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>DDL and DML statements can be executed incrementally.</p> <section><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>0 && r==KErrNone)

    {

    r=op.Next(step);

    }

op.Close();

...

// r has the error code from the operation</codeblock> </section> <section><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>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>