What is STORED PROCEDURE?
A stored procedure is a pre-compiled SQL subroutine used to perform multiple procedural operations.
MySQL store procedure
Here’s a MySQL store procedure, which accept a stock code parameter and return the related stock data.
DELIMITER $$
CREATE PROCEDURE `GetStocks`(int_stockcode VARCHAR(20))
BEGIN
SELECT * FROM stock WHERE stock_code = int_stockcode;
END $$
DELIMITER ;
In MySQL, you can simple call it with a call keyword :
CALL GetStocks('7277');
How to call MSSQL and MYSQL stored procedure in Hibernate?
In Hibernate, there are two approaches to call a database store procedure.
1. Native SQL – createSQLQuery
You can use createSQLQuery() to call a store procedure directly.
Query query = session.createSQLQuery(
"CALL GetStocks(:stockCode)")
.addEntity(Stock.class)
.setParameter("stockCode", "7277");
List result = query.list();
for(int i=0; i<result.size(); i++){
Stock stock = (Stock)result.get(i);
System.out.println(stock.getStockCode());
}
2. NamedNativeQuery in annotation
Declare your store procedure inside the @NamedNativeQueries annotation.
//Stock.java
...
@NamedNativeQueries({
@NamedNativeQuery(
name = "callStockStoreProcedure",
query = "CALL GetStocks(:stockCode)",
resultClass = Stock.class
)
})
@Entity
@Table(name = "stock")
public class Stock implements java.io.Serializable {
...
Call it with getNamedQuery().
Query query = session.getNamedQuery("callStockStoreProcedure")
.setParameter("stockCode", "7277");
List result = query.list();
for(int i=0; i<result.size(); i++){
Stock stock = (Stock)result.get(i);
System.out.println(stock.getStockCode());
}
The above approaches are doing the same thing, call a store procedure in database. There are not much big different between the three approaches, which method you choose is depend on your personal prefer.
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