maxdb_prepare

maxdb::prepare

Prepare an SQL statement for execution

Beschreibung

Prozeduraler Stil

resource maxdb_prepare ( resource $link , string $query )

Objektorientierter Stil

maxdb_stmt maxdb::prepare ( string $query )

maxdb_prepare prepares the SQL query pointed to by the null-terminated string query, and returns a statement handle to be used for further operations on the statement. The query must consist of a single SQL statement.

Hinweis:
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.

Hinweis:
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.

Rückgabewerte

maxdb_prepare returns a statement resource or FALSE if an error occurred.

Beispiele

Beispiel #1 Objektorientierter Stil


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

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

$city = "Rosemont";

/* create a prepared statement */
if ($stmt = $maxdb->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();
?>

Beispiel #2 Prozeduraler Stil


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

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

$city = "Rosemont";

/* create a prepared statement */
if ($stmt = maxdb_prepare($link, "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);
?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

Rosemont is in district IL

Siehe auch

maxdb_stmt_execute
maxdb_stmt_fetch
maxdb_stmt_bind_param
maxdb_stmt_bind_result
maxdb_stmt_close