mysqli
PHP Manual

mysqli::prepare

mysqli_prepare

(PHP 5)

mysqli::prepare -- mysqli_preparePrepare an SQL statement for execution

Opis

Styl obiektowy

mysqli_stmt mysqli::prepare ( string $query )

Styl proceduralny

mysqli_stmt mysqli_prepare ( mysqli $link , string $query )

Prepares the SQL query, and returns a statement handle to be used for further operations on the statement. The query must consist of a single SQL statement.

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

Parametry

połączenie

Tylko styl proceduralny: Identyfikator połączenia zwrócony przez mysqli_connect() lub mysqli_init()

query

The query, as a string.

Informacja:

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

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

Informacja:

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. It's not allowed to compare marker with NULL by ? IS NULL too. In general, parameters are legal only in Data Manipulation Language (DML) statements, and not in Data Definition Language (DDL) statements.

Zwracane wartości

mysqli_prepare() returns a statement object or FALSE if an error occurred.

Przykłady

Przykład #1 mysqli::prepare() example

Styl obiektowy

<?php
$mysqli 
= new mysqli("localhost""my_user""my_password""world");

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

$city "Amersfoort";

/* create a prepared statement */
if ($stmt $mysqli->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);

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

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

Styl proceduralny

<?php
$link 
mysqli_connect("localhost""my_user""my_password""world");

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

$city "Amersfoort";

/* create a prepared statement */
if ($stmt mysqli_prepare($link"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);

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

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

Powyższe przykłady wyświetlą:

Amersfoort is in district Utrecht

Zobacz też:


mysqli
PHP Manual