int mysql_stmt_prepare(MYSQL_STMT *stmt, const char
*stmt_str, unsigned long length)
Given the statement handle returned by
mysql_stmt_init(), prepares the
SQL statement pointed to by the string
stmt_str and returns a status value. The
string length should be given by the
argument. The string must consist of a single SQL statement. You
should not add a terminating semicolon
to the statement.
The application can include one or more parameter markers in the
SQL statement by embedding question mark (
characters into the SQL string at the appropriate positions.
The markers are legal only in certain places in SQL statements.
For example, they are permitted in the
VALUES() list of an
INSERT statement (to specify
column values for a row), or in a comparison with a column in a
WHERE clause to specify a comparison value.
However, they are not permitted for identifiers (such as table
or column names), or to specify both operands of a binary
operator such as the
= equal sign. The latter
restriction is necessary because it would be impossible to
determine the parameter type. In general, parameters are legal
only in Data Manipulation Language (DML) statements, and not in
Data Definition Language (DDL) statements.
The parameter markers must be bound to application variables
before executing the statement.
Metadata changes to tables or views referred to by prepared statements are detected and cause automatic repreparation of the statement when it is next executed. For more information, see Section 8.10.4, “Caching of Prepared Statements and Stored Programs”.
Zero for success. Nonzero if an error occurred.
See the Example in Section 220.127.116.11, “mysql_stmt_execute()”.