PHP:pg_prepare()的用法_PostgreSQL函数

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pg_prepare

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(PHP 5 >= 5.1.0)

pg_prepare — Submits a request to create a prepared statement with the given parameters, and waits for completion.

说明 resource pg_prepare ([ resource $connection ], string $stmtname , string $query )

pg_prepare() creates a prepared statement for later execution with pg_execute() or pg_send_execute(). This feature allows commands that will be used repeatedly to be parsed and planned just once, rather than each time they are executed. pg_prepare() is supported only against PostgreSQL 7.4 or higher connections; it will fail when using earlier versions.

The function creates a prepared statement named stmtname from the query string, which must contain a single SQL command. stmtname may be "" to create an unnamed statement, in which case any pre-existing unnamed statement is automatically replaced; otherwise it is an error if the statement name is already defined in the current session. If any parameters are used, they are referred to in the query as $1, $2, etc.

Prepared statements for use with pg_prepare() can also be created by executing SQL PREPARE statements. (But pg_prepare() is more flexible since it does not require parameter types to be pre-specified.) Also, although there is no PHP function for deleting a prepared statement, the SQL DEALLOCATE statement can be used for that purpose.

参数

connection PHP:pg_prepare()的用法_PostgreSQL函数

PostgreSQL database connection resource. When connection is not present, the default connection is used. The default connection is the last connection made by pg_connect() or pg_pconnect().

stmtname

The name to give the prepared statement. Must be unique per-connection. If "" is specified, then an unnamed statement is created, overwriting any previously defined unnamed statement.

query

The parameterized SQL statement. Must contain only a single statement. (multiple statements separated by semi-colons are not allowed.) If any parameters are used, they are referred to as $1, $2, etc.

返回值

A query result resource on success 或者在失败时返回 FALSE.

范例

Example #1 Using pg_prepare()

<?php//Connecttoadatabasenamed"mary"$dbconn=pg_connect("dbname=mary");//Prepareaqueryforexecution$result=pg_prepare($dbconn,"my_query",'SELECT*FROMshopsWHEREname=$1');//Executethepreparedquery.Notethatitisnotnecessarytoescape//thestring"Joe'sWidgets"inanyway$result=pg_execute($dbconn,"my_query",array("Joe'sWidgets"));//Executethesamepreparedquery,thistimewithadifferentparameter$result=pg_execute($dbconn,"my_query",array("ClothesClothesClothes"));?>

参见

pg_execute() - Sends a request to execute a prepared statement with given parameters, and waits for the result. pg_send_execute() - Sends a request to execute a prepared statement with given parameters, without waiting for the result(s).

PHP:pg_port()的用法_PostgreSQL函数 pg_port(PHP4,PHP5)pg_port返回该连接的端口号说明intpg_port(resource$connection)pg_port()返回给定的PostgreSQLconnection资源所连接的端口号。

PHP:pg_pconnect()的用法_PostgreSQL函数 pg_pconnect(PHP4,PHP5)pg_pconnect打开一个持久的PostgreSQL连接说明resourcepg_pconnect(string$connection_string[,int$connect_type])pg_pconnect()打开一个到PostgreSQL数据库的持久连

PHP:pg_ping()的用法_PostgreSQL函数 pg_ping(PHP4=4.3.0,PHP5)pg_pingPing数据库连接说明boolpg_ping(resource$connection)pg_ping()ping数据库连接，如果中断则尝试重新连接。如果连接在活动状态返回TRUE，否

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