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MyBatis demo application chapter1.
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‎mybatisdemo-parent/chapter01/README.txt‎

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This module demonstrate the basic usage of MyBatis persistence framework.

‎mybatisdemo-parent/chapter01/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
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http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>com.mybatisdemo</groupId>
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<artifactId>mybatisdemo-parent</artifactId>
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<version>0.0.1</version>
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</parent>
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<artifactId>chapter01</artifactId>
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<packaging>jar</packaging>
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<name>chapter01</name>
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<url>http://sivalabs.blogspot.in</url>
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<description>MyBatis Book Chapter 01</description>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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<build>
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<finalName>${project.artifactId}</finalName>
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</build>
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<dependencies>
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</dependencies>
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</project>

‎mybatisdemo-parent/chapter01/src/main/java/chapter01/JdbcStudentService.java‎

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package chapter01;
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import java.sql.Connection;
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import java.sql.DriverManager;
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import java.sql.PreparedStatement;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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/**
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* @author Siva
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*
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*/
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public class JdbcStudentService
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{
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public static void main(String[] args)
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{
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JdbcStudentService service = new JdbcStudentService();
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Student student = service.findStudentById(1);
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System.out.println(student);
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//student.setId(2);
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//service.createStudent(student);
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student.setId(2);
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student.setEmail("student2@gmail.com");
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service.updateStudent(student);
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}
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public Student findStudentById(int studId)
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{
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Student student = null;
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Connection conn = null;
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try
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{
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conn = getDatabaseConnection();
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String sql = "select * from students where stud_id=?";
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PreparedStatement pstmt = conn.prepareStatement(sql);
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pstmt.setInt(1, studId);
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ResultSet rs = pstmt.executeQuery();
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if(rs.next())
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{
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student = new Student();
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student.setId(rs.getInt("stud_id"));
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student.setName(rs.getString("name"));
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student.setEmail(rs.getString("email"));
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student.setDob(rs.getDate("dob"));
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}
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} catch (SQLException e)
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{
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throw new RuntimeException(e);
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}
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finally
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{
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if(conn!= null){
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try {
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conn.close();
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} catch (SQLException e){ }
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}
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}
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return student;
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}
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public void createStudent(Student student)
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{
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Connection conn = null;
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try
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{
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conn = getDatabaseConnection();
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String sql = "INSERT INTO STUDENTS(STUD_ID,NAME,EMAIL,DOB) VALUES(?,?,?,?)";
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PreparedStatement pstmt = conn.prepareStatement(sql);
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pstmt.setInt(1, student.getId());
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pstmt.setString(2, student.getName());
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pstmt.setString(3, student.getEmail());
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pstmt.setDate(4, new java.sql.Date(student.getDob().getTime()));
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pstmt.executeUpdate();
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} catch (SQLException e)
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{
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throw new RuntimeException(e);
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}
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finally
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{
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if(conn!= null){
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try {
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conn.close();
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} catch (SQLException e){ }
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}
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}
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}
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public void updateStudent(Student student)
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{
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Connection conn = null;
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try
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{
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conn = getDatabaseConnection();
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conn = getDatabaseConnection();
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String sql = "UPDATE STUDENTS SET NAME=?,EMAIL=?,DOB=? WHERE STUD_ID=?";
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PreparedStatement pstmt = conn.prepareStatement(sql);
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pstmt.setString(1, student.getName());
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pstmt.setString(2, student.getEmail());
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pstmt.setDate(3, new java.sql.Date(student.getDob().getTime()));
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pstmt.setInt(4, student.getId());
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pstmt.executeUpdate();
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} catch (SQLException e)
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{
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throw new RuntimeException(e.getCause());
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}
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finally
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{
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if(conn!= null){
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try {
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conn.close();
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} catch (SQLException e){ }
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}
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}
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}
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protected Connection getDatabaseConnection() throws SQLException
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{
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try
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{
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Class.forName("com.mysql.jdbc.Driver");
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return DriverManager.getConnection("jdbc:mysql://localhost:3306/mybatisdemo",
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"root", "admin");
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} catch (SQLException e)
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{
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throw e;
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} catch (Exception e)
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{
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throw new RuntimeException(e.getCause());
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}
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}
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}

‎mybatisdemo-parent/chapter01/src/main/java/chapter01/MyBatisUtil.java‎

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package chapter01;
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import java.io.IOException;
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import java.io.InputStream;
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import org.apache.ibatis.io.Resources;
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import org.apache.ibatis.session.SqlSessionFactory;
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import org.apache.ibatis.session.SqlSessionFactoryBuilder;
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/**
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* @author Siva
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*
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*/
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public class MyBatisUtil
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{
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private static SqlSessionFactory sqlSessionFactory;
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public static SqlSessionFactory getSqlSessionFactory()
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{
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if(sqlSessionFactory==null)
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{
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InputStream inputStream;
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try
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{
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inputStream = Resources.getResourceAsStream("mybatis-config.xml");
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sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
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}catch (IOException e)
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{
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throw new RuntimeException(e.getCause());
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}
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}
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return sqlSessionFactory;
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}
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}

‎mybatisdemo-parent/chapter01/src/main/java/chapter01/Student.java‎

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package chapter01;
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import java.util.Date;
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/**
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* @author Siva
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*
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*/
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public class Student
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{
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private Integer id;
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private String name;
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private String email;
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private Date dob;
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@Override
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public String toString()
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{
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return "Student [id=" + id + ", name=" + name + ", email=" + email
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+ ", dob=" + dob + "]";
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}
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public Student()
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{
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}
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public Student(Integer id)
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{
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this.id = id;
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}
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public Integer getId()
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{
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return id;
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}
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public void setId(Integer id)
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{
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this.id = id;
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}
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public String getName()
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{
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return name;
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}
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public void setName(String name)
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{
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this.name = name;
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}
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public String getEmail()
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{
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return email;
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}
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public void setEmail(String email)
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{
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this.email = email;
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}
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public Date getDob()
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{
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return dob;
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}
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public void setDob(Date dob)
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{
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this.dob = dob;
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}
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}

‎mybatisdemo-parent/chapter01/src/main/java/chapter01/StudentMapper.java‎

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package chapter01;
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import java.util.List;
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/**
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* @author Siva
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*
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*/
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public interface StudentMapper
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{
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List<Student> findAllStudents();
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Student findStudentById(Integer id);
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void insertStudent(Student student);
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void updateStudent(Student student);
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}

‎mybatisdemo-parent/chapter01/src/main/java/chapter01/StudentService.java‎

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package chapter01;
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import java.util.List;
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import org.apache.ibatis.session.SqlSession;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class StudentService
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{
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private Logger logger = LoggerFactory.getLogger(getClass());
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public List<Student> findAllStudents()
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{
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SqlSession sqlSession = MyBatisUtil.getSqlSessionFactory().openSession();
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try {
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StudentMapper studentMapper = sqlSession.getMapper(StudentMapper.class);
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return studentMapper.findAllStudents();
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} finally {
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sqlSession.close();
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}
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}
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public Student findStudentById(Integer studId)
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{
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logger.debug("Select Student By ID :{}", studId);
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SqlSession sqlSession = MyBatisUtil.getSqlSessionFactory().openSession();
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try {
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StudentMapper studentMapper = sqlSession.getMapper(StudentMapper.class);
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return studentMapper.findStudentById(studId);
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//return sqlSession.selectOne("chapter01.StudentMapper.findStudentById", studId);
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} finally {
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sqlSession.close();
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}
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}
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public void createStudent(Student student)
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{
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SqlSession sqlSession = MyBatisUtil.getSqlSessionFactory().openSession();
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try {
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StudentMapper studentMapper = sqlSession.getMapper(StudentMapper.class);
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studentMapper.insertStudent(student);
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sqlSession.commit();
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} finally {
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sqlSession.close();
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}
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}
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public void updateStudent(Student student)
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{
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SqlSession sqlSession = MyBatisUtil.getSqlSessionFactory().openSession();
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try {
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StudentMapper studentMapper = sqlSession.getMapper(StudentMapper.class);
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studentMapper.updateStudent(student);
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sqlSession.commit();
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} finally {
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sqlSession.close();
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}
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}
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}

‎mybatisdemo-parent/chapter01/src/main/resources/application.properties‎

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################### DataSource Configuration ##########################
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jdbc.driverClassName=com.mysql.jdbc.Driver
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jdbc.url=jdbc:mysql://localhost:3306/mybatisdemo
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jdbc.username=root
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jdbc.password=admin

‎mybatisdemo-parent/chapter01/src/main/resources/chapter01/StudentMapper.xml‎

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<?xml version="1.0" encoding="UTF-8" ?>
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<!DOCTYPE mapper
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PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
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"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
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<mapper namespace="chapter01.StudentMapper">
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<resultMap type="Student" id="StudentResult">
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<id property="id" column="student_id"/>
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<result property="name" column="name"/>
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<result property="email" column="email"/>
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<result property="dob" column="dob"/>
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</resultMap>
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<select id="findAllStudents" resultMap="StudentResult">
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select * from Students
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</select>
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<select id="findStudentById" parameterType="int" resultType="Student">
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select stud_id as id, name, email, dob from Students where stud_id=#{Id}
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</select>
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<insert id="insertStudent" parameterType="Student">
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INSERT INTO STUDENTS(STUD_ID,NAME,EMAIL,DOB) VALUES(#{id},#{name},#{email},#{dob})
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</insert>
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<update id="updateStudent" parameterType="Student">
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UPDATE STUDENTS SET NAME=#{name}, EMAIL=#{email}, DOB=#{dob} WHERE STUD_ID=#{id}
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</update>
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</mapper>

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