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Implement Dynamic SQL query inside a MySQL stored procedure?
For dynamic SQL query in a stored procedure, use the concept of PREPARE STATEMENT. Let us first create a table −
mysql> create table DemoTable2033 -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(20) -> ); Query OK, 0 rows affected (1.61 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable2033(Name) values('Chris');
Query OK, 1 row affected (0.85 sec)
mysql> insert into DemoTable2033(Name) values('Bob');
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable2033(Name) values('David');
Query OK, 1 row affected (0.24 sec)
mysql> insert into DemoTable2033(Name) values('Mike');
Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −
mysql> select *from DemoTable2033;
This will produce the following output −
+----+-------+ | Id | Name | +----+-------+ | 1 | Chris | | 2 | Bob | | 3 | David | | 4 | Mike | +----+-------+ 4 rows in set (0.00 sec)
Following is the query to create a stored procedure and implement dynamic SQL −
mysql> delimiter //
mysql> create procedure dynamic_query()
-> begin
-> set @query=concat("select *from DemoTable2033 where Id=3");
-> prepare st from @query;
-> execute st;
-> end
-> //
Query OK, 0 rows affected (0.13 sec)
mysql> delimiter ;Call the stored procedure −
mysql> call dynamic_query();
This will produce the following output −
+----+-------+ | Id | Name | +----+-------+ | 3 | David | +----+-------+ 1 row in set (0.04 sec) Query OK, 0 rows affected (0.05 sec)
Updated on: 07-Apr-2020
3K+ Views
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