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<a href="../c3ref/intro.html"><h2>SQLite C Interface</h2></a>
<h2>One-Step Query Execution Interface</h2>
</div>
<blockquote><pre>
int sqlite3_exec(
sqlite3*, /* An open database */
const char *sql, /* SQL to be evaluated */
int (*callback)(void*,int,char**,char**), /* Callback function */
void *, /* 1st argument to callback */
char **errmsg /* Error msg written here */
);
</pre></blockquote>
<p>
The sqlite3_exec() interface is a convenience wrapper around
<a href="../c3ref/prepare.html">sqlite3_prepare_v2()</a>, <a href="../c3ref/step.html">sqlite3_step()</a>, and <a href="../c3ref/finalize.html">sqlite3_finalize()</a>,
that allows an application to run multiple statements of SQL
without having to use a lot of C code.</p>
<p>The sqlite3_exec() interface runs zero or more UTF-8 encoded,
semicolon-separate SQL statements passed into its 2nd argument,
in the context of the <a href="../c3ref/sqlite3.html">database connection</a> passed in as its 1st
argument. If the callback function of the 3rd argument to
sqlite3_exec() is not NULL, then it is invoked for each result row
coming out of the evaluated SQL statements. The 4th argument to
sqlite3_exec() is relayed through to the 1st argument of each
callback invocation. If the callback pointer to sqlite3_exec()
is NULL, then no callback is ever invoked and result rows are
ignored.</p>
<p>If an error occurs while evaluating the SQL statements passed into
sqlite3_exec(), then execution of the current statement stops and
subsequent statements are skipped. If the 5th parameter to sqlite3_exec()
is not NULL then any error message is written into memory obtained
from <a href="../c3ref/free.html">sqlite3_malloc()</a> and passed back through the 5th parameter.
To avoid memory leaks, the application should invoke <a href="../c3ref/free.html">sqlite3_free()</a>
on error message strings returned through the 5th parameter of
sqlite3_exec() after the error message string is no longer needed.
If the 5th parameter to sqlite3_exec() is not NULL and no errors
occur, then sqlite3_exec() sets the pointer in its 5th parameter to
NULL before returning.</p>
<p>If an sqlite3_exec() callback returns non-zero, the sqlite3_exec()
routine returns SQLITE_ABORT without invoking the callback again and
without running any subsequent SQL statements.</p>
<p>The 2nd argument to the sqlite3_exec() callback function is the
number of columns in the result. The 3rd argument to the sqlite3_exec()
callback is an array of pointers to strings obtained as if from
<a href="../c3ref/column_blob.html">sqlite3_column_text()</a>, one for each column. If an element of a
result row is NULL then the corresponding string pointer for the
sqlite3_exec() callback is a NULL pointer. The 4th argument to the
sqlite3_exec() callback is an array of pointers to strings where each
entry represents the name of corresponding result column as obtained
from <a href="../c3ref/column_name.html">sqlite3_column_name()</a>.</p>
<p>If the 2nd parameter to sqlite3_exec() is a NULL pointer, a pointer
to an empty string, or a pointer that contains only whitespace and/or
SQL comments, then no SQL statements are evaluated and the database
is not changed.</p>
<p>Restrictions:</p>
<p><ul>
<li> The application must ensure that the 1st parameter to sqlite3_exec()
is a valid and open <a href="../c3ref/sqlite3.html">database connection</a>.
<li> The application must not close the <a href="../c3ref/sqlite3.html">database connection</a> specified by
the 1st parameter to sqlite3_exec() while sqlite3_exec() is running.
<li> The application must not modify the SQL statement text passed into
the 2nd parameter of sqlite3_exec() while sqlite3_exec() is running.
<li> The application must not dereference the arrays or string pointers
passed as the 3rd and 4th callback parameters after it returns.
</ul>
</p><p>See also lists of
<a href="../c3ref/objlist.html">Objects</a>,
<a href="../c3ref/constlist.html">Constants</a>, and
<a href="../c3ref/funclist.html">Functions</a>.</p>
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