Assign an SQL result to variable from prepared statement in MySQL?

For this, use stored procedure. Let us first create a table −

mysql> create table DemoTable(Id int, Name varchar(100)); Query OK, 0 rows affected (1.51 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values(10,'John'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(11,'Chris'); Query OK, 1 row affected (0.41 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+------+-------+ | Id | Name    | +------+-------+ | 10 | John    | | 11 | Chris | +------+-------+ 2 rows in set (0.00 sec)

Following is the query to assign SQL result to variable from prepared statement in MySQL −

mysql> DELIMITER // mysql> CREATE PROCEDURE Prepared_Statement_Demo( nameOfTable VARCHAR(20), IN nameOfColumn VARCHAR(20), IN idColumnName INT) BEGIN    SET @holdResult=CONCAT('SELECT ', nameOfColumn, ' INTO @value FROM ', nameOfTable, ' WHERE id = ', idColumnName);       PREPARE st FROM @holdResult;       EXECUTE st;       DEALLOCATE PREPARE st;    END // Query OK, 0 rows affected (0.20 sec) mysql> DELIMITER ;

Call the stored procedure using call command −

mysql> call Prepared_Statement_Demo('DemoTable','Name',10); Query OK, 0 rows affected, 2 warnings (0.00 sec)

Now check the value of variable @value −

mysql> select @value;

This will produce the following output −

+--------+ | @value | +--------+ | John | +--------+ 1 row in set (0.00 sec)