Table of Contents
定义和用法
语法
说明
返回值

PHP mysql

Jun 06, 2016 pm 07:46 PM
mysql php query function usage

定义和用法 mysql_query() 函数执行一条 MySQL 查询。 语法 mysql_query(query,connection) 参数 描述 query 必需。规定要发送的 SQL 查询。注释:查询字符串不应以分号结束。 connection 可

定义和用法

mysql_query() 函数执行一条 MySQL 查询。

语法

mysql_query(query,connection)
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参数 描述
query 必需。规定要发送的 SQL 查询。注释:查询字符串不应以分号结束。
connection 可选。规定 SQL 连接标识符。如果未规定,则使用上一个打开的连接。

说明

如果没有打开的连接,本函数会尝试无参数调用 mysql_connect() 函数来建立一个连接并使用之。

返回值

mysql_query() 仅对 SELECT,SHOW,EXPLAIN 或 DESCRIBE 语句返回一个资源标识符,如果查询执行不正确则返回 FALSE。

对于其它类型的 SQL 语句,mysql_query() 在执行成功时返回 TRUE,出错时返回 FALSE。

非 FALSE 的返回值意味着查询是合法的并能够被服务器执行。这并不说明任何有关影响到的或返回的行数。很有可能一条查询执行成功了但并未影响到或并未返回任何行。

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