How to use php to manipulate mysqli database
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
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
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('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: 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('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);
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 = "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 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('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 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 '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;$i<5;$i++){ $id = 0; $name = 'name'; $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);
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
Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study.
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