Mysql Php连接mysql总结

 

1、连接Mysql

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$con = mysql_connect("localhost","root","");  
if (!$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

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mysql_select_db("test", $con);  

mysql_select_db("test", $con);

3、数据库查询

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$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

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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

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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

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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

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mysql_close($con);