一.整体步骤
1.读取全局配置文件“SqlMapConfig.xml”
2.用SqlSessionFactoryBuilder来创建一个SqlSessionFactory
3.用创建好的SqlSessionFactory创建一个SqlSession
4.用创建好的SqlSession来读取对应的映射配置文件“Mapper1.xml”，并传入参数
5.返回结果
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二.具体步骤
1.新建maven项目
eclipse菜单找到“File”->"new"->"Project",选择Maven Project
2.在配置文件pom.xml下的denpencies添加denpency
mybatis的jar包和mysql的jdbc驱动
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.6</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.35</version>
</dependency>
3.在src/main下新建资源文件夹"resources",并添加SqlMapConfig.xml、具体映射配置文件Mapper.xml和数据库参数文件db.properties
SqlMapConfig.xml源码:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<properties resource="db.properties"></properties>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="${driver}"/>
<property name="url" value="${url}"/>
<property name="username" value="${username}"/>
<property name="password" value="${password}"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="StudentMapper.xml"/>
</mappers>
</configuration>
db.properties的源码：
driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8
username=root
password=123456
Mapper.xml的源码
<?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="test">
<select id="selectPerson" parameterType="int" resultType="com.mavenTest.mybatis_test.Person">
select * from Persons_table where id = #{id}
</select>
</mapper>
#{}：是经过处理的相当于JDBC的PreparedStatement，简单类型时“{}”里可以写任意名字（甚至是中文）
${}：是原样输出相当于JDBC的Statement，简单类型时“{}”里必须写“value”
4.在main/java下的任意jar包中创建一个pojo，这里例如是Person.class（注意对应好上面的resultType的路径）
public class Person{
private int id;
private String name;
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;
}
}
5.在java/main的任意jar包创建一个任意类
public class pratise {
public static void main(String[] args) throws IOException{
// 读取全局配置文件
InputStream is = Resources.getResourceAsStream("SqlMapConfig.xml");
// 用SqlSessionFactoryBuilder来创建SqlSessionFactory实例
SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(is);
// 用SqlSessionFactory实例来创建SqlSession实例
SqlSession ss = ssf.openSession();
// 通过SqlSession实例来查询映射配置文件，然后传入参数，执行sql语句
Student s = ss.selectOne("selectStudent", 827);
// 关闭SqlSession实例
ss.close();
System.out.println(s.getName());
}
}
这样就已经可以实现数据库语句的调用了