How do I create an SqlSessionFactory object in MyBatis?

The example below shows you how to create MyBatis SqlSessionFactory object using an XML configuration. The steps required is to create the configuration file. This file basically contains the connection information to the database and MyBatis configuration such as typeAliases and the mappers.

The next steps is to read the configuration file using a org.apache.ibatis.io.Resources class. This information then passes as the argument to the build() method of the SqlSessionFactoryBuilder class. The build() method return an SqlSessionFactory object.

package org.kodejava.mybatis;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.kodejava.mybatis.support.Record;

import java.io.IOException;
import java.io.Reader;

public class SqlSessionFactoryDemo {

    public static void main(String[] args) throws IOException {
        // A resource file for MyBatis configuration.
        Reader reader = Resources.getResourceAsReader("configuration.xml");

        // Creates an SqlSessionFactoryBuilder. This builder need only 
        // create one time during the application lifetime.
        SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();

        // Creates an instance of SqlSessionFactory. This object can be 
        // used to initiate an SqlSession for querying information from 
        // the mapped query.
        SqlSessionFactory factory = builder.build(reader);
        System.out.println("factory = " + factory);

        try (SqlSession session = factory.openSession()) {
            RecordMapper mapper = session.getMapper(RecordMapper.class);
            Record record = mapper.getRecord(1L);
            System.out.println("Record = " + record);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Below is an example of MyBatis configuration file:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "https://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <typeAliases>
        <typeAlias alias="record" type="org.kodejava.mybatis.support.Record" />
    </typeAliases>
    <environments default="dev">
        <environment id="dev">
            <transactionManager type="JDBC" />
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.cj.jdbc.Driver" />
                <property name="url" value="jdbc:mysql://localhost/musicdb" />
                <property name="username" value="music" />
                <property name="password" value="s3cr*t" />
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="org/kodejava/mybatis/mapper/RecordMapper.xml" />
    </mappers>
</configuration>

Below are the other supporting files and classes for the code above, RecordMapper.xml, RecordMapper and Record.

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "https://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="org.kodejava.mybatis.RecordMapper">

    <resultMap id="recordResultMap" type="record">
        <result column="id" property="id"/>
        <result column="title" property="title"/>
        <result column="release_date" property="releaseDate"/>
        <result column="artist_id" property="artistId"/>
        <result column="label_id" property="labelId"/>
    </resultMap>

    <select id="getRecord" parameterType="java.lang.Long" resultMap="recordResultMap">
        SELECT id,
            title,
            release_date,
            artist_id,
            label_id
        FROM record
        WHERE id = #{id}
    </select>
</mapper>

package org.kodejava.mybatis;

import org.kodejava.mybatis.support.Record;

public interface RecordMapper {
    /**
     * Get a single record from the database based on the record
     * identifier.
     *
     * @param id record identifier.
     * @return a record object.
     */
    Record getRecord(Long id);
}

package org.kodejava.mybatis.support;

import java.io.Serializable;
import java.util.Date;

public class Record implements Serializable {
    private Long id;
    private String title;
    private Date releaseDate;
    private Long artistId;
    private Long labelId;

    // Getters & Setters

    @Override
    public String toString() {
        return "Record{" +
                "id=" + id +
                ", title='" + title + '\'' +
                ", releaseDate=" + releaseDate +
                ", artistId=" + artistId +
                ", labelId=" + labelId +
                '}';
    }
}

Maven Dependencies

<dependencies>
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.13</version>
    </dependency>
    <dependency>
        <groupId>com.mysql</groupId>
        <artifactId>mysql-connector-j</artifactId>
        <version>8.1.0</version>
    </dependency>
</dependencies>

Author
Recent Posts

Wayan

Founder at Kode Java

A programmer, runner and recreational diver, lives on the island of Bali, Indonesia. Programming in Java, Spring Framework, Hibernate / JPA, MySQL. To support me working on this project, buy me a cup of coffee, every little bit helps. Thank you.

Leave a ReplyCancel reply