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