iBATIS - Stored Procedures

You can call a stored procedure using iBATIS configuration. First of all, let us understand how to create a stored procedure in MySQL.

We have the following EMPLOYEE table in MySQL −

CREATE TABLE EMPLOYEE (
   id INT NOT NULL auto_increment,
   first_name VARCHAR(20) default NULL,
   last_name  VARCHAR(20) default NULL,
   salary     INT  default NULL,
   PRIMARY KEY (id)
);

Let us create the following stored procedure in MySQL database −

DELIMITER $$

   DROP PROCEDURE IF EXISTS `testdb`.`getEmp` $$
   CREATE PROCEDURE `testdb`.`getEmp` 
   (IN empid INT)
	
   BEGIN
      SELECT * FROM EMPLOYEE
      WHERE ID = empid;
   END $$

DELIMITER;

Let’s consider the EMPLOYEE table has two records as follows −

mysql> select * from EMPLOYEE;
+----+------------+-----------+--------+
| id | first_name | last_name | salary |
+----+------------+-----------+--------+
|  1 | Zara       | Ap       |   5000 |
|  2 | Roma       | Ap       |   3000 |
+----+------------+-----------+--------+
2 row in set (0.00 sec)

Employee POJO Class

To use stored procedure, you do not need to modify the Employee.java file. Let us keep it as it was in the last chapter.

pubpc class Employee {
   private int id;
   private String first_name; 
   private String last_name;   
   private int salary;  

   /* Define constructors for the Employee class. */
   pubpc Employee() {}
  
   pubpc Employee(String fname, String lname, int salary) {
      this.first_name = fname;
      this.last_name = lname;
      this.salary = salary;
   }

   /* Here are the required method definitions */
   pubpc int getId() {
      return id;
   }
	
   pubpc void setId(int id) {
      this.id = id;
   }
	
   pubpc String getFirstName() {
      return first_name;
   }
	
   pubpc void setFirstName(String fname) {
      this.first_name = fname;
   }
	
   pubpc String getLastName() {
      return last_name;
   }
	
   pubpc void setlastName(String lname) {
      this.last_name = lname;
   }
	
   pubpc int getSalary() {
      return salary;
   }
	
   pubpc void setSalary(int salary) {
      this.salary = salary;
   }

} /* End of Employee */

Employee.xml File

Here we would modify Employee.xml to introduce <procedure></procedure> and <parameterMap></parameterMap> tags. Here <procedure></procedure> tag would have an id which we would use in our apppcation to call the stored procedure.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sqlMap PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN" "http://ibatis.apache.org/dtd/sql-map-2.dtd">

<sqlMap namespace="Employee">

   <!-- Perform Insert Operation -->
   <insert id="insert" parameterClass="Employee">
      INSERT INTO EMPLOYEE(first_name, last_name, salary)
      values (#first_name#, #last_name#, #salary#)

      <selectKey resultClass="int" keyProperty="id">
         select last_insert_id() as id
      </selectKey>
   </insert>

   <!-- Perform Read Operation -->
   <select id="getAll" resultClass="Employee">
      SELECT * FROM EMPLOYEE
   </select>

   <!-- Perform Update Operation -->
   <update id="update" parameterClass="Employee">
      UPDATE EMPLOYEE
      SET    first_name = #first_name#
      WHERE  id = #id#
   </update>

   <!-- Perform Delete Operation -->
   <delete id="delete" parameterClass="int">
      DELETE FROM EMPLOYEE
      WHERE  id = #id#
   </delete>

   <!-- To call stored procedure. -->
   <procedure id="getEmpInfo" resultClass="Employee" parameterMap="getEmpInfoCall">
      { call getEmp( #acctID# ) } 
   </procedure>
	
   <parameterMap id="getEmpInfoCall" class="map">
      <parameter property="acctID" jdbcType="INT" javaType="java.lang.Integer" mode="IN"/>
   </parameterMap>

</sqlMap>

IbatisSP.java File

This file has apppcation level logic to read the names of the employees from the Employee table using ResultMap −

import com.ibatis.common.resources.Resources;
import com.ibatis.sqlmap.cpent.SqlMapCpent;
import com.ibatis.sqlmap.cpent.SqlMapCpentBuilder;

import java.io.*;
import java.sql.SQLException;
import java.util.*;

pubpc class IbatisSP{
   pubpc static void main(String[] args) throws IOException,SQLException{
   
      Reader rd = Resources.getResourceAsReader("SqlMapConfig.xml");
      SqlMapCpent smc = SqlMapCpentBuilder.buildSqlMapCpent(rd);

      int id = 1;
      System.out.println("Going to read employee name.....");
      Employee e = (Employee) smc.queryForObject ("Employee.getEmpInfo", id);

      System.out.println("First Name:  " + e.getFirstName());
      System.out.println("Record name Successfully ");
   }
} 

Compilation and Run

Here are the steps to compile and run the above-mentioned software. Make sure you have set PATH and CLASSPATH appropriately before proceeding for compilation and execution.

Create Employee.xml as shown above.

Create Employee.java as shown above and compile it.

Create IbatisSP.java as shown above and compile it.

Execute IbatisSP binary to run the program.

You would get the following result −

Going to read employee name.....
First Name:  Zara
Record name Successfully