Mysql Php连接mysql总结

 

1、连接Mysql

$con = mysql_connect("localhost","root","");
if (!$con){
    echo 'Could not connect: ' . mysql_error();
}

$con = mysql_connect("localhost","root","");
if (!$con){
	echo 'Could not connect: ' . mysql_error();
}

2、选择数据库

mysql_select_db("test", $con);

mysql_select_db("test", $con);

3、数据库查询

$sql = "INSERT INTO table_name (id, name, status) VALUES('123456','me',1)";

$sql = "UPDATE table_name SET `status` = 0 WHERE `id` = '123456'";

$sql = "DELETE FROM table_name WHERE `id` = '123456'";

$sql = "SELECT * FROM table_name WHERE `status` = 1";

$result = mysql_query($sql);

$sql = "INSERT INTO table_name (id, name, status) VALUES('123456','me',1)";

$sql = "UPDATE table_name SET `status` = 0 WHERE `id` = '123456'";

$sql = "DELETE FROM table_name WHERE `id` = '123456'";

$sql = "SELECT * FROM table_name WHERE `status` = 1";

$result = mysql_query($sql);

4、判断查询是否成功

select的时候

if(mysql_num_rows($result)>=0){
    //query success
}else{
    //query failed
}

if(mysql_num_rows($result)>=0){
	//query success
}else{
	//query failed
}

insert、delete、update的时候

if(mysql_affected_rows($con)>0){
    //query success
}else{
    //query failed
}

if(mysql_affected_rows($con)>0){
	//query success
}else{
	//query failed
}

5、处理select返回的数据

if((mysql_num_rows($result)>0)){
    while($row = mysql_fetch_assoc($result))
    {
        $tmp_array[] = $row;
    }
}

if((mysql_num_rows($result)>0)){
	while($row = mysql_fetch_assoc($result))
	{
		$tmp_array[] = $row;
	}
}

$temp_array中就是以数组的形式保存着返回的数据

6、关闭连接

mysql_close($con);