How to use php to manipulate mysqli database-PHP Tutorial-php.cn

This article mainly introduces the method of manipulating the mysqli database in PHP. Interested friends can refer to it. I hope it will be helpful to everyone.

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

i means improved functions, high efficiency and stability

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

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Due to copyright issues, starting from php5.3, php will use mysqlnd instead of libmysql.dll
mysqlnd is a mysql database driver developed by zend company. Compared with the original, it has improved in all aspects

#Compile using mysqlnd

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

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mysqli process , object mode all support the three classes provided by

mysqli:

1, mysqli and connection related
2 , MySQLi_Result processing result set
3, mysqli_stmt preprocessing class

#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(&#39;127.0.0.1&#39;, &#39;root&#39;, &#39;&#39;, &#39;test&#39;);

//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(&#39;127.0.0.1&#39;, &#39;root&#39;, &#39;&#39;, &#39;test&#39;);

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query: returns false on failure, select returns the result set object successfully, and other returns true if 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(&#39;127.0.0.1&#39;, &#39;root&#39;, &#39;&#39;, &#39;test&#39;);

$sql = "insert into limove(`name`, `order`) values(&#39;aa&#39;, 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);

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There is a result set

$mysqli = mysqli_init();
$mysqli->options(MYSQLI_OPT_CONNECT_TIMEOUT, 2);//设置超时时间
$mysqli->real_connect(&#39;127.0.0.1&#39;, &#39;root&#39;, &#39;&#39;, &#39;test&#39;);

$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();

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Execute multiple statements multiquery at one time (not recommended)

No result set, at this time affected_rows can only get the number of the last affected rows

$mysqli = mysqli_init();
$mysqli->options(MYSQLI_OPT_CONNECT_TIMEOUT, 2);//设置超时时间
$mysqli->real_connect(&#39;127.0.0.1&#39;, &#39;root&#39;, &#39;&#39;, &#39;test&#39;);


$sql_arr = array(
  &#39;insert into limove(id,`name`, `order`) values(null, 1, 2)&#39;,    
  &#39;insert into limove(id,`name`, `order`) values(null, 1, 222)&#39;,    
  &#39;delete from limove where `order` = 2&#39;,    
);

$sql = implode(&#39;;&#39;, $sql_arr);

$result = $mysqli->multi_query($sql);
if($result === false)
{
  ee($mysqli->errno);
  ee($mysqli->error);
}

$mysqli->close();

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There is a result set

$mysqli = mysqli_init();
$mysqli->options(MYSQLI_OPT_CONNECT_TIMEOUT, 2);//设置超时时间
$mysqli->real_connect(&#39;127.0.0.1&#39;, &#39;root&#39;, &#39;&#39;, &#39;test&#39;);

$sql_arr = array(
  &#39;show tables&#39;,    
  &#39;desc select * from limove&#39;,    
  &#39;show create table limove&#39;,    
);

$sql = implode(&#39;;&#39;, $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();

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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=&#39;zhangsan&#39;";
  
  $result=$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=&#39;lisi1&#39;";

  $result=$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();

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mysqli_stmt: mysqli preprocessing class (recommended): represents a prepared statement, the server only compiles 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 sql can be prevented Injection generation

mysqli_stmt example: non-select statement

require &#39;fns.php&#39;;

//创建mysqli对象方式 
$mysqli = @new mysqli(&#39;127.0.0.1&#39;, &#39;root&#39;, &#39;&#39;, &#39;test&#39;);

//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(&#39;utf8&#39;);

$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(&#39;iss&#39;, $id, $name, $order);

for($i=0;$i<5;$i++){
  $id = 0;
  $name = &#39;name&#39;;
  $order = mt_rand(1, 1000);
  $stmt->execute();

}

//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);

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mysqli_stmt example: select statement 1

require &#39;fns.php&#39;;

//创建mysqli对象方式 
$mysqli = @new mysqli(&#39;127.0.0.1&#39;, &#39;root&#39;, &#39;&#39;, &#39;test&#39;);

//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(&#39;utf8&#39;);

$sql = "select * from limove where id

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Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study.

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