maxdb_prepare

maxdb::prepare

(PECL maxdb >= 1.0)

maxdb_prepare -- maxdb::prepare — Prepare an SQL statement for execution

说明

过程化风格

maxdb_prepare ( resource $link , string $query ) : resource

面向对象风格

maxdb::prepare ( string $query ) : maxdb_stmt

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.

Note:
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.

Note:
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.

返回值

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

范例

Example #1 面向对象风格


<?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();
?>

Example #2 过程化风格


<?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);
?>

以上例程的输出类似于：

Rosemont is in district IL

参见

maxdb_stmt_execute() - Executes a prepared Query
maxdb_stmt_fetch() - Fetch results from a prepared statement into the bound variables
maxdb_stmt_bind_param() - Binds variables to a prepared statement as parameters
maxdb_stmt_bind_result() - Binds variables to a prepared statement for result storage
maxdb_stmt_close() - Closes a prepared statement

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官方地址：https://www.php.net/manual/en/function.maxdb-prepare.php

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maxdb_prepare

maxdb::prepare

说明

返回值

范例

参见

User Contributed Notes