PHP failed to write to mysql database

When writing a web page, under certain circumstances, mysql_connect may connect to the database, and mysql_select_db selects the correct table, but mysql_query cannot be used to insert data into the database.

There are many situations when you encounter this situation. First, you have to check whether your sql statement can run normally in the Mysql command line and whether it can complete the function. If it can run normally, it means that your sql statement is correct. Then use

  $res = mysql_query($sql, $con);
   if($res){
       echo "插入成功";
   }
    else{
     echo mysql_error();
    }

to solve the problem based on the error message. If mysql_error() cannot be displayed; it may be a coding error. Add mysql_query( "set names GBK"); it can be solved by adding your own mysql encoding method after the names.

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