maxdb_stmt_prepare

Руководство по PHP
Пред.		След.

Description

Procedure style:

bool maxdb_stmt_prepare ( resource stmt, string query )

Object oriented style (method)

class stmt {

mixed prepare ( string query )

}

maxdb_stmt_prepare() prepares the SQL query pointed to by the null-terminated string query. The statement resource has to be allocated by maxdb_stmt_init(). The query must consist of a single SQL statement.

Замечание: You should not add a terminating semicolon or \g to the statement.

The parameter query can include one or more parameter markers in the SQL statement by embedding question mark (?) characters at the appropriate positions.

Замечание: The markers are legal only in certain places in SQL statements. For example, they are allowed 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 allowed for identifiers (such as table or column names), in the select list that names the columns to be returned by a SELECT statement), 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 Languange (DML) statements, and not in Data Defination Language (DDL) statements.

The parameter markers must be bound to application variables using maxdb_stmt_bind_param() and/or maxdb_stmt_bind_result() before executing the statement or fetching rows.

Возвращаемые значения

Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки.

Example

Пример 1. Object oriented style


<?php
$maxdb = new maxdb("localhost", "MONA", "RED", "DEMODB");

/* check connection */
if (maxdb_connect_errno()) {
   printf("Connect failed: %s\n", maxdb_connect_error());
   exit();
}

$city = "Portland";

/* create a prepared statement */
$stmt =  $maxdb->stmt_init();
if ($stmt->prepare("SELECT state FROM hotel.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);

   /* close statement */
   $stmt->close();
} 

/* close connection */
$maxdb->close();
?>

Пример 2. Procedural style


<?php
$link = maxdb_connect("localhost", "MONA", "RED", "DEMODB");

/* check connection */
if (maxdb_connect_errno()) {
   printf("Connect failed: %s\n", maxdb_connect_error());
   exit();
}

$city = "Portland";

/* create a prepared statement */
$stmt = maxdb_stmt_init($link);
if (maxdb_stmt_prepare($stmt, "SELECT state FROM hotel.city WHERE name=?")) {

   /* bind parameters for markers */
   maxdb_stmt_bind_param($stmt, "s", $city);

   /* execute query */
   maxdb_stmt_execute($stmt);

   /* bind result variables */
   maxdb_stmt_bind_result($stmt, $district);

   /* fetch value */
   maxdb_stmt_fetch($stmt);

   printf("%s is in district %s\n", $city, $district);

   /* close statement */
   maxdb_stmt_close($stmt);
} 

/* close connection */
maxdb_close($link);
?>

The above examples would produce the following output:

Portland is in district OR

Пред.	Начало	След.
maxdb_stmt_param_count	Уровень выше	maxdb_stmt_reset

maxdb_stmt_prepare

Description

Возвращаемые значения

Смотрите также

Example