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Set user-defined variable with table name in MySQL prepare statement?
Let us first create a table −
mysql> create table DemoTable ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentName varchar(20) ); Query OK, 0 rows affected (0.71 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable(StudentName) values('Chris');
Query OK, 1 row affected (0.21 sec)
mysql> insert into DemoTable(StudentName) values('David');
Query OK, 1 row affected (0.06 sec)
mysql> insert into DemoTable(StudentName) values('Sam');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable(StudentName) values('Mike');
Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −
mysql> select * from DemoTable;
This will produce the following output −
+-----------+-------------+ | StudentId | StudentName | +-----------+-------------+ | 1 | Chris | | 2 | David | | 3 | Sam | | 4 | Mike | +-----------+-------------+ 4 rows in set (0.00 sec)
Here is the how you can use a user-defined variable to set a table name and work with MySQL prepare statement −
mysql> set @tableName = 'DemoTable';
Query OK, 0 rows affected (0.04 sec)
mysql> set @queryToSelectStudentName := concat('select StudentName from ',@tableName);
Query OK, 0 rows affected (0.28 sec)
mysql> prepare executeQuery from @queryToSelectStudentName;
Query OK, 0 rows affected (0.04 sec)
Statement prepared
mysql> execute executeQuery;This will produce the following output −
+-------------+ | StudentName | +-------------+ | Chris | | David | | Sam | | Mike | +-------------+ 4 rows in set (0.00 sec)
Updated on: 05-Jan-2021
2K+ Views
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