PHP database operations--data preprocessing, update, delete

Statement preprocessing: Generally speaking, it is a query and multiple executions. It will be often used in our later projects.

Creation:

//Creation preprocessing

$createinto=$connent->prepare("insert into zh(name,age,email) values (?,?,?)");

sql statement, the parameters use? instead of reserved

//绑定 $createinto->bind_param("sis",$name,$age,$email);

The binding parameter s is String type i is int type

$name="zhanghao1"; $age=1; $email="1234123123@qq.com"; $createinto->execute(); $name="zhanghao2"; $age=2; $email="1234123123@qq.com"; $createinto->execute();

Execute the statement; finally the data is inserted successfully. (The premise is to connect to the database and use)

Delete the specified entry:

mysqli_query($connent,"delete from zh where name='zhanghao1'");

Delete the entire table data without adding where conditions

Update the specified entry:

mysqli_query($connent,"update zh set age=3 where name='zhanghao2'");

Modify zhanghao2’s age to 3

Close the database after all database operations are completed.

----Complete code-------

       connect_error){ die("连接失败: " . $connent->connect_error); }else{ echo "成功"; } //创建预处理 $createinto=$connent->prepare("insert into zh(name,age,email) values (?,?,?)"); //绑定 $createinto->bind_param("sis",$name,$age,$email); //多次执行 $name="zhanghao1"; $age=1; $email="1234123123@qq.com"; $createinto->execute(); $name="zhanghao2"; $age=2; $email="1234123123@qq.com"; $createinto->execute(); echo "插入成功"; //删除数据 删除表中 name为zhanghao1的数据 mysqli_query($connent,"delete from zh where name='zhanghao1'"); mysqli_query($connent,"update zh set age=3 where name='zhanghao2'"); $connent->close(); ?>

We can find that where is the basis for judging conditions. According to it, we can conditionally query, Condition deletion and condition modification.