iBATIS - Update Operation

Advertisements


Last chapter has shown how to perform READ operation on a table using iBATIS. This chapter would show you how you can update records in a table using iBATIS.

We have 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)
);

This table is having only one record as follows:

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

Employee POJO Class:

To perform udpate operation you would need to modify Employee.java file as follows:

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

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

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

 } /* End of Employee */

Employee.xml File:

To define SQL mapping statement using iBATIS, we would add <update> tag in Employee.xml file and inside this tag definition we would define an "id" which will be used in IbatisUpdate.java file for executing SQL UPDATE query on database.

<?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">
<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>

<select id="getAll" resultClass="Employee">
   SELECT * FROM EMPLOYEE
</select>

<update id="update" parameterClass="Employee">
   UPDATE EMPLOYEE
   SET    first_name = #first_name#
   WHERE  id = #id#
</update>
</sqlMap>

IbatisUpdate.java File:

This file would have application level logic to update records into the Employee table:

import com.ibatis.common.resources.Resources;
import com.ibatis.sqlmap.client.SqlMapClient;
import com.ibatis.sqlmap.client.SqlMapClientBuilder;
import java.io.*;
import java.sql.SQLException;
import java.util.*;

public class IbatisUpdate{
  public static void main(String[] args)
   throws IOException,SQLException{
   Reader rd = Resources.getResourceAsReader("SqlMapConfig.xml");
   SqlMapClient smc = SqlMapClientBuilder.buildSqlMapClient(rd);

   /* This would update one record in Employee table. */
   System.out.println("Going to update record.....");
   Employee rec = new Employee();
   rec.setId(1);
   rec.setFirstName( "Roma");
   smc.update("Employee.update", rec );
   System.out.println("Record updated Successfully ");

   System.out.println("Going to read records.....");
   List <Employee> ems = (List<Employee>)
                  smc.queryForList("Employee.getAll", null);
   Employee em = null;
   for (Employee e : ems) {
      System.out.print("  " + e.getId());
      System.out.print("  " + e.getFirstName());
      System.out.print("  " + e.getLastName());
      System.out.print("  " + e.getSalary());
      em = e; 
      System.out.println("");
   }    

   System.out.println("Records Read 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 the compilation and execution.

  • Create Employee.xml as shown above.

  • Create Employee.java as shown above and compile it.

  • Create IbatisUpdate.java as shown above and compile it.

  • Execute IbatisUpdate binary to run the program.

You would get following result, and a record would be updated in EMPLOYEE table and later same record would be read from the EMPLOYEE table.

Going to update record.....
Record updated Successfully
Going to read records.....
  1  Roma  Ali  5000
Records Read Successfully


Advertisements
Advertisements