php manipulates mysqli database

Mysql(i) support has been added since php5.0, and the new functions are added in the form of objects

i means improved functions, high efficiency, and stability

Recommended related mysql video tutorials: "mysql Tutorial 》

Compile time parameters:

./configure --with-mysql=/usr/bin/mysql_config \ #使用 Mysql ClientLibrary（libmysql）构建
--with-mysqli=mysqlnd \ #使用 Mysql Native Dirver 即mysqlnd
--with-pdo-mysql=mysqlnd #使用 Mysql Native Dirver 即mysqlnd

Due to copyright issues, starting from php5.3, php started to use mysqlnd instead of libmysql.dll

mysqlnd is a mysql database driver developed by zend company, which is better than the original in all aspects Improve

#Use mysqlnd to compile

./configure --with-mysql=mysqlnd --with-mysqli=mysqlnd --with-pdo-mysql=mysqlnd 加上你的参数

mysqli. The process and object methods support the three classes provided by

mysqli:

   1、mysqli 和连接相关的
   2、MySQLi_Result 处理结果集
   3、mysqli_stmt 预处理类

#Set character set
set_charset

#Get character set
character_set_name

Get the database object

//创建mysqli对象方式 1
//屏蔽连接产生的错误$mysqli = new mysqli('127.0.0.1', 'root', '', 'test');//只能用函数来判断是否连接成功if(mysqli_connect_errno())
{    echo mysqli_connect_error();
}//创建mysqli对象方式 2 可以设置一些参数$mysqli = mysqli_init();$mysqli->options(MYSQLI_OPT_CONNECT_TIMEOUT, 2);//设置超时时间$mysqli->real_connect('127.0.0.1', 'root', '', 'test');

query: Failure returns false, select successfully returns the result set object, others return true and not false, which means that the SQL execution is successful

No result set example

$mysqli = mysqli_init();$mysqli->options(MYSQLI_OPT_CONNECT_TIMEOUT, 2);//设置超时时间$mysqli->real_connect('127.0.0.1', 'root', '', 'test');$sql = "insert into limove(`name`, `order`) values('aa', 11)";$rst = $mysqli->query($sql);$sql = "delete from limove where id = 221";$rst = $mysqli->query($sql);if($rst === false)
{
    ee($mysqli->errno);
    ee($mysqli->error);
}#影响条数
ee($mysqli->affected_rows);#插入的id
ee($mysqli->insert_id);

ee($mysqli);

With result set

$mysqli = mysqli_init();$mysqli->options(MYSQLI_OPT_CONNECT_TIMEOUT, 2);//设置超时时间$mysqli->real_connect('127.0.0.1', 'root', '', 'test');$sql = "select * from limove as limove_as";$result = $mysqli->query($sql);if($result === false)
{
    ee($mysqli->errno);
    ee($mysqli->error);
}#行数
ee($result->num_rows);#列数
ee($result->field_count);#字段个数
ee($result->field_count);#获取所有字段的信息$field_arr = $result->fetch_fields();#移动字段的指针
// $result->field_seek(1);#依次获取字段的信息while($field = $result->fetch_field())
{
    ee($field);
}#移动记录指针$result->data_seek(1);#一次获取所有数据$data = $result->fetch_all(MYSQLI_ASSOC);#关联数组方式获取结果集$data = array();$result->data_seek(0); #重置指针到起始while($row = $result->fetch_assoc())
{    $data[] = $row;
}

ee($data);$result->free();$mysqli->close();

Execute multiple statements at one time multiquery ( Not recommended)

　There is no result set, at this time affected_rows can only get the number of the last affected row

$mysqli = mysqli_init();$mysqli->options(MYSQLI_OPT_CONNECT_TIMEOUT, 2);//设置超时时间$mysqli->real_connect('127.0.0.1', 'root', '', 'test');$sql_arr = array(
    'insert into limove(id,`name`, `order`) values(null, 1, 2)',        
    'insert into limove(id,`name`, `order`) values(null, 1, 222)',        
    'delete from limove where `order` = 2',        );$sql = implode(';', $sql_arr);$result = $mysqli->multi_query($sql);if($result === false)
{
    ee($mysqli->errno);
    ee($mysqli->error);
}$mysqli->close();

There is a result set

$mysqli = mysqli_init();$mysqli->options(MYSQLI_OPT_CONNECT_TIMEOUT, 2);//设置超时时间$mysqli->real_connect('127.0.0.1', 'root', '', 'test');$sql_arr = array(
    'show tables',        
    'desc select * from limove',        
    'show create table limove',        );$sql = implode(';', $sql_arr);$rst = $mysqli->multi_query($sql);if($rst === false)
{
    ee($mysqli->errno);
    ee($mysqli->error);
}do{    $result = $mysqli->store_result();#获取当前光标所在的结果集    
    $data = $result->fetch_all();
    
    ee($data);
    
}while($mysqli->next_result());#光标移动到下一个结果集$mysqli->close();

Transaction processing:

$mysqli=new mysqli("localhost", "root", "123456", "xsphpdb");    //事务处理    $mysqli->autocommit(0);    $error=true;    $price=50;    $sql="update zh set ye=ye-{$price} where name='zhangsan'";    
    $result=$mysqli->query($sql);    if(!$result){        $error=false;        echo "从张三转出失败
";
    }else{        if($mysqli->affected_rows==0){            $error=false;            echo "张三的钱没有变化";    
        }else{            echo "从张三账号中转出成功!
";
        }
    }    $sql="update zh set ye=ye+{$price} where name='lisi1'";    $result=$mysqli->query($sql);    if(!$result){        $error=false;        echo "从李四转入失败
";
    }else{        if($mysqli->affected_rows==0){            $error=false;            echo "李四的钱没有变化";    
        }else{            echo "向李四账号中转入成功!
";
        }
    }    if($error){        echo "转账成功!";        $mysqli->commit();
    }else{        echo "转账失败!";        $mysqli->rollback();
    }    $mysqli->autocommit(1);    $mysqli->close();

mysqli_stmt:mysqli preprocessing class (recommended): Represents a prepared statement. The server only compiles the sql once

The same function can be achieved with mysqli and mysqli_result

Advantages: High efficiency, suitable for situations where the statements are the same but the data is different, and can prevent the occurrence of sql injection

mysqli_stmt example: non-select statement

require  'fns.php';//创建mysqli对象方式 
$mysqli = @new mysqli('127.0.0.1', 'root', '', 'test');//只能用函数来判断是否连接成功if(mysqli_connect_errno())
{    echo mysqli_connect_error();    die;
}$mysqli->set_charset('utf8');$sql = "insert into limove values(?, ?, ?)"; //语句一样值不相同情况//mysqli中有直接的方法可用$stmt = $mysqli->prepare($sql);//绑定参数$stmt->bind_param('iss', $id, $name, $order);for($i=0;$iexecute();

}//最后id
ee($stmt->insert_id);//影响的行数 注:最后一条执行的
ee($stmt->affected_rows);//错误号
ee($stmt->errno);//错误信息
ee($stmt->error);//stmt对象中可以看到更多的信息
ee($stmt);

eee($mysqli);

mysqli_stmt example: select statement 1

require  'fns.php';//创建mysqli对象方式 
$mysqli = @new mysqli('127.0.0.1', 'root', '', 'test');//只能用函数来判断是否连接成功if(mysqli_connect_errno())
{    echo mysqli_connect_error();    die;
}$mysqli->set_charset('utf8');$sql = "select * from limove where id