(mysql.info.gz) C API Prepared statements
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22.2.4 C API Prepared Statements
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As of MySQL 4.1, the client/server protocol provides for the use of
prepared statements. This capability uses the `MYSQL_STMT' statement
handler data structure returned by the `mysql_stmt_init()'
initialization function. Prepared execution is an efficient way to
execute a statement more than once. The statement is first parsed to
prepare it for execution. Then it is executed one or more times at a
later time, using the statement handle returned by the initialization
function.
Prepared execution is faster than direct execution for statements
executed more than once, primarily because the query is parsed only
once. In the case of direct execution, the query is parsed every time
it is executed. Prepared execution also can provide a reduction of
network traffic because for each execution of the prepared statement,
it is necessary only to send the data for the parameters.
Another advantage of prepared statements is that it uses a binary
protocol that makes data transfer between client and server more
efficient.
The following statements can be used as prepared statements: `CREATE
TABLE', `DELETE', `DO', `INSERT', `REPLACE', `SELECT', `SET', `UPDATE',
and most `SHOW', statements. Other statements are not yet supported.
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(mysql.info.gz) C API Prepared statement datatypes
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