1，导入MyBatis的依赖
<dependencies>
<dependency>
<groupId>org.mybatisgroupId>
<artifactId>mybatisartifactId>
<version>3.4.6version>
dependency>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
<version>5.1.46version>
<scope>runtimescope>
dependency>
<dependency>
<groupId>junitgroupId>
<artifactId>junitartifactId>
<version>4.12version>
<scope>testscope>
dependency>
dependencies>
2，需要映射的实体类，User.class
public class User {
private int id;
private String username;
private String password;
private String email;
private String gender;
private int flag;
private int role;
private String code;
private List<Order> orders;
public List<Order> getOrders() {
return orders;
}
public void setOrders(List<Order> orders) {
this.orders = orders;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
public int getFlag() {
return flag;
}
public void setFlag(int flag) {
this.flag = flag;
}
public int getRole() {
return role;
}
public void setRole(int role) {
this.role = role;
}
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", password='" + password + '\'' +
", email='" + email + '\'' +
", gender='" + gender + '\'' +
", flag=" + flag +
", role=" + role +
", code='" + code + '\'' +
", orders=" + orders +
'}';
}
}
3，MyBatis的接口mapper类UserMapper.class这里使用了注解而非xml方式
public interface UserMapper {
@Select("select * from tb_user where username =#{username} and password =#{password}")
User findUserByNameAndPassword(@Param("username") String username, @Param("password") String password);
@Select("select id uid ,username, password from tb_user where username =#{username} and password =#{password}")
@ResultMap("basemap")
User findUserByNameAndPassword1(@Param("username") String username, @Param("password") String password);
@Select("select id uid ,username name , password pwd from tb_user where username =#{username} and password =#{password}")
@Results({
@Result(id = true,column = "uid",property = "id"),
@Result(column = "name",property = "username"),
@Result(column = "pwd" ,property = "password")})
User findUserByNameAndPassword2(@Param("username") String username, @Param("password") String password);
@SelectProvider(type = SqlUtil.class,method = "findUserByUserNameAndEmailSql")
List<User> findUserByNameAndPassword3(@Param("username") String username, @Param("email") String email);
4，sql的查询工具类
public class SqlUtil {
public String findUserByUserNameAndEmailSql(Map<String,Object> params){
String username = (String) params.get("username");
String email = (String) params.get("email");
BEGIN();
SELECT("id ,username, password");
FROM("tb_user");
if (username != null) {
WHERE("username =#{username}");
}
if (email != null) {
WHERE("email =#{email}");
}
return SQL();
}
}
5，MyBatis的配置类SqlMapConfig.xml
<configuration>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING" />
settings>
<environments default="abc">
<environment id="abc">
<transactionManager type="JDBC">transactionManager>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql:///db_shopping?useUnicode=true&characterEncoding=UTF8"/>
<property name="username" value="root"/>
<property name="password" value="qishimeiyoumima"/>
dataSource>
environment>
environments>
<mappers>
<package name="person.david.mybatis.mapper"/>
mappers>
configuration>
6，测试类TestMain.class
public class TestMain {
private SqlSessionFactory sqlSessionFactory;
@Before
public void before() throws IOException {
InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);
}
@Test
public void test12() {
SqlSession sqlSession = sqlSessionFactory.openSession();
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
User u = mapper.findUserByNameAndPassword1("admin", "e10adc3949ba59abbe56e057f20f883e");
System.out.println(u);
}
@Test
public void test13() {
SqlSession sqlSession = sqlSessionFactory.openSession();
UserMapper1 mapper = sqlSession.getMapper(UserMapper1.class);
User u = mapper.findUserByNameAndPassword("lee", "e10adc3949ba59abbe56e057f20f883e");
sqlSession.close();
System.out.println(u);
}
@Test
public void test14() {
SqlSession sqlSession = sqlSessionFactory.openSession();
UserMapper1 mapper = sqlSession.getMapper(UserMapper1.class);
User u = mapper.findUserByNameAndPassword2("lee", "e10adc3949ba59abbe56e057f20f883e");
sqlSession.close();
System.out.println(u);
}
@Test
public void test15() {
SqlSession sqlSession = sqlSessionFactory.openSession();
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
User u = mapper.findUserById(10);
sqlSession.close();
SqlSession sqlSession1 = sqlSessionFactory.openSession();
UserMapper mapper1 = sqlSession1.getMapper(UserMapper.class);
User u1 = mapper1.findUserById(10);
sqlSession1.close();
System.out.println(u);
System.out.println(u1);
}
