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Mybatis - UPDATE OPERATION

We discussed, in the last chapter, how to perform READ operation on a table using MyBatis. This chapter explains how you can update records in a table using it.

We have the following STUDENT table in MySQL:

CREATE TABLE details.student(
ID int(10) NOT NULL AUTO_INCREMENT,
NAME varchar(100) NOT NULL,
BRANCH varchar(255) NOT NULL,
PERCENTAGE int(3) NOT NULL,
PHONE int(11) NOT NULL,
EMAIL varchar(255) NOT NULL,
PRIMARY KEY (`ID`)
);

Assume this table has two record as follows:

mysql> select * from STUDENT;
+----+----------+--------+------------+-----------+--------------------+
| ID | NAME | BRANCH | PERCENTAGE | PHONE | EMAIL |
+----+----------+--------+------------+-----------+--------------------+
| 1 | Mohammad | It | 80 | 984803322 | Mohammad@gmail.com |
| 2 | shyam | It | 75 | 984800000 | shyam@gmail.com |
+----+----------+--------+------------+-----------+--------------------+

Student POJO Class

To perform update operation, you would need to modify Student.java file as:

public class Student {
private int id;
private String name;
private String branch;
private int percentage;
private int phone;
private String email;
public Student(int id, String name, String branch, int percentage, int phone, String email) {
super();
this.id = id;
this.name = name;
this.setBranch(branch);
this.setPercentage(percentage);
this.phone = phone;
this.email = email;

} public Student() {}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getPhone() {
return phone;
}
public void setPhone(int phone) {
this.phone = phone;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getBranch() {
return branch;
}
public void setBranch(String branch) {
this.branch = branch;
}
public int getPercentage() {
return percentage;
}
public void setPercentage(int percentage) {
this.percentage = percentage;
}
public String toString(){
StringBuilder sb = new StringBuilder();
sb.append("Id = ").append(id).append(" - ");
sb.append("Name = ").append(name).append(" - ");
sb.append("Branch = ").append(branch).append(" - ");
sb.append("Percentage = ").append(percentage).append(" - ");
sb.append("Phone = ").append(phone).append(" - ");
sb.append("Email = ").append(email);
return sb.toString();
}
}

Student.xml File

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

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="Student">
<resultMap id="result" type="Student">
<result property="id" column="ID"/>
<result property="name" column="NAME"/>
<result property="branch" column="BRANCH"/>
<result property="percentage" column="PERCENTAGE"/>
<result property="phone" column="PHONE"/>
<result property="email" column="EMAIL"/>
</resultMap>
<select id="getById" parameterType="int" resultMap="result">
SELECT * FROM STUDENT WHERE ID = #{id};
</select>
<update id="update" parameterType="Student">
UPDATE STUDENT SET NAME = #{name},
BRANCH = #{branch},
PERCENTAGE = #{percentage},
PHONE = #{phone},
EMAIL = #{email}
WHERE ID = #{id};
</update>
</mapper>

mybatisUpdate.java File

This file has application level logic to update records into the Student table:

import java.io.IOException;
import java.io.Reader;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
public class mybatisUpdate {
public static void main(String args[]) throws IOException{
Reader reader = Resources.getResourceAsReader("SqlMapConfig.xml");
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
SqlSession session = sqlSessionFactory.openSession();
//select a particular student using id
Student student = (Student) session.selectOne("Student.getById", 1);
System.out.println("Current details of the student are" );
System.out.println(student.toString());
//Set new values to the mail and phone number of the student
student.setEmail("mohamad123@yahoo.com");
student.setPhone(90000000);
//Update the student record
session.update("Student.update",student);
System.out.println("Record updated successfully");
session.commit();
session.close();
//verifying the record
Student std = (Student) session.selectOne("Student.getById", 1);
System.out.println("Details of the student after update operation" );
System.out.println(std.toString());
session.commit();
session.close();
}
}

Compilation and Run

Here are the steps to compile and run mybatisUpdate.java. Make sure, you have set PATH and CLASSPATH appropriately before proceeding for compilation and execution.

Create Student.xml as shown above.
Create SqlMapConfig.xml as shown in the MYBATIS - Configuration XML chapter of this tutorial.
Create Student.java as shown above and compile it.
Create mybatisUpdate.java as shown above and compile it.
Execute mybatisUpdate binary to run the program.

You would get following result. You can see the details of a particular record initially, and that record would be updated in STUDENT table and later, you can also see the updated record.

Current details of the student are
Id = 1 - Name = Mohammad - Branch = It - Percentage = 80 - Phone = 984802233 - Email = mohammad@gmail.com
Record updated successfully
Details of the student after update operation
Id = 1 - Name = Mohammad - Branch = It - Percentage = 80 - Phone = 90000000 - Email = mohamad123@yahoo.com

If you check the STUDENT table, it should display the following result:

mysql> select * from student;
+----+----------+--------+------------+-----------+----------------------+
| ID | NAME | BRANCH | PERCENTAGE | PHONE | EMAIL |
+----+----------+--------+------------+-----------+----------------------+
| 1 | Mohammad | It | 80 | 90000000 | mohamad123@yahoo.com |
| 2 | shyam | It | 75 | 984800000 | shyam@gmail.com |
+----+----------+--------+------------+-----------+----------------------+
2 rows in set (0.00 sec)

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Mybatis - UPDATE OPERATION