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diff --git a/www/c3ref/exec.html b/www/c3ref/exec.html new file mode 100644 index 0000000..f892dab --- /dev/null +++ b/www/c3ref/exec.html @@ -0,0 +1,194 @@ +<!DOCTYPE html> +<html><head> +<meta name="viewport" content="width=device-width, initial-scale=1.0"> +<meta http-equiv="content-type" content="text/html; charset=UTF-8"> +<link href="../sqlite.css" rel="stylesheet"> +<title>One-Step Query Execution Interface</title> +<!-- path=../ --> +</head> +<body> +<div class=nosearch> +<a href="../index.html"> +<img class="logo" src="../images/sqlite370_banner.gif" alt="SQLite" border="0"> +</a> +<div><!-- IE hack to prevent disappearing logo --></div> +<div class="tagline desktoponly"> +Small. Fast. 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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. +</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> + |