Php/docs/function.pg-escape-literal

• PHP Manual
• PostgreSQL 函数
• Escape a literal for insertion into a text field

pg_escape_literal

(PHP 5 >= 5.4.4, PHP 7)

pg_escape_literal — Escape a literal for insertion into a text field

说明

pg_escape_literal ([ resource $connection ], string $data ) : string

pg_escape_literal() escapes a literal for querying the PostgreSQL database. It returns an escaped literal in the PostgreSQL format. pg_escape_literal() adds quotes before and after data. Users should not add quotes. Use of this function is recommended instead of pg_escape_string(). If the type of the column is bytea, pg_escape_bytea() must be used instead. For escaping identifiers (e.g. table, field names), pg_escape_identifier() must be used.

Note:

This function has internal escape code and can also be used with PostgreSQL 8.4 or less.

参数

connection

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(). When there is no default connection, it raises E_WARNING and returns false.

data

A string containing text to be escaped.

返回值

A string containing the escaped data.

范例

Example #1 pg_escape_literal() example

<?php   // Connect to the database  $dbconn = pg_connect('dbname=foo');    // Read in a text file (containing apostrophes and backslashes)  $data = file_get_contents('letter.txt');    // Escape the text data  $escaped = pg_escape_literal($data);    // Insert it into the database. Note that no quotes around {$escaped}  pg_query("INSERT INTO correspondence (name, data) VALUES ('My letter', {$escaped})");?>

参见

• pg_escape_identifier() - Escape a identifier for insertion into a text field
• pg_escape_bytea() - 转义 bytea 类型的二进制数据
• pg_escape_string() - 转义 text/char 类型的字符串