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(PHP 5, PHP 7, PHP 8)
mysqli_stmt::prepare -- mysqli_stmt_prepare — Prepares an SQL statement for execution
面向对象风格
$query): bool
过程化风格
Prepares a statement for execution. The query must consist of a single SQL statement.
The statement template can contain zero or more question mark
(?) parameter markers—also called placeholders.
The parameter markers must be bound to application variables using
mysqli_stmt_bind_param() before executing the statement.
注意:
In the case where a statement is passed to mysqli_stmt_prepare() that is longer than
max_allowed_packetof the server, the returned error codes are different depending on whether you are using MySQL Native Driver (mysqlnd) or MySQL Client Library (libmysqlclient). The behavior is as follows:
mysqlndon Linux returns an error code of 1153. The error message meansgot a packet bigger than.max_allowed_packetbytes
mysqlndon Windows returns an error code 2006. This error message meansserver has gone away.
libmysqlclienton all platforms returns an error code 2006. This error message meansserver has gone away.
statement
仅以过程化样式：由 mysqli_stmt_init() 返回的 mysqli_stmt 对象。
query
The query, as a string. It must consist of a single SQL statement.
The SQL statement may contain zero or more parameter markers
represented by question mark (?) characters
at the appropriate positions.
注意:
The markers are legal only in certain places in SQL statements. For example, they are permitted in the
VALUES()list of anINSERTstatement (to specify column values for a row), or in a comparison with a column in aWHEREclause to specify a comparison value. However, they are not permitted for identifiers (such as table or column names).
成功时返回 true， 或者在失败时返回 false。
示例 #1 mysqli_stmt::prepare() example
面向对象风格
<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
$city = "Amersfoort";
/* create a prepared statement */
$stmt = $mysqli->stmt_init();
$stmt->prepare("SELECT District FROM City WHERE Name=?");
/* bind parameters for markers */
$stmt->bind_param("s", $city);
/* execute query */
$stmt->execute();
/* bind result variables */
$stmt->bind_result($district);
/* fetch value */
$stmt->fetch();
printf("%s is in district %s\n", $city, $district);
过程化风格
<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
$city = "Amersfoort";
/* create a prepared statement */
$stmt = mysqli_stmt_init($link);
mysqli_stmt_prepare($stmt, "SELECT District FROM City WHERE Name=?");
/* bind parameters for markers */
mysqli_stmt_bind_param($stmt, "s", $city);
/* execute query */
mysqli_stmt_execute($stmt);
/* bind result variables */
mysqli_stmt_bind_result($stmt, $district);
/* fetch value */
mysqli_stmt_fetch($stmt);
printf("%s is in district %s\n", $city, $district);
以上例程会输出：
Amersfoort is in district Utrecht
