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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)
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