一个更为详细的MyBatis(3.2.3)示例
2014-07-31 17:00
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1. 数据库中有如下三张表：
2. 实体类：
学生实体：
3. 在数据表teachers中tel字段是varcha类型，在实体Teacher中tel属性是自定义的JavaBean，需要自定义类型处理器处理：
4. 映射器：
StudentMapper：
5. 映射器SQLMapper配置文件：
StudentMapper.xml：
6. 数据库连接属性配置jdbc.properties：
7. 配置文件mybatis-config.xml：
8. 工具类MyBatisUtil：
9. 业务逻辑层接口：
StudentServ：
10. 业务逻辑层实现：
StudentServImpl：
11. log4j.properties配置：
12. 单元测试：
StudentServImplTest：
CREATE TABLE students ( stud_no INTEGER NOT NULL AUTO_INCREMENT, stud_name VARCHAR(50) NOT NULL, birthday DATE NOT NULL, email VARCHAR(128), PRIMARY KEY (stud_no) ) ;
CREATE TABLE teachers ( tch_id INTEGER NOT NULL, tch_name VARCHAR(50) NOT NULL, birthday DATE, tel VARCHAR(20), PRIMARY KEY (tch_id) ) ;
CREATE TABLE courses ( crs_id INTEGER NOT NULL AUTO_INCREMENT, crs_name VARCHAR(50) NOT NULL, description VARCHAR(100), crs_year YEAR, crs_season VARCHAR(10), tch_id INTEGER, PRIMARY KEY (crs_id), KEY (tch_id) ) ; ALTER TABLE courses ADD CONSTRAINT FK_courses_teachers FOREIGN KEY (tch_id) REFERENCES teachers (tch_id);
2. 实体类：
学生实体：
package com.huey.mybatis.entity;
import java.util.Date;
/**
* 学生实体
* @author huey2672
* @version 1.0
* @created 2014-7-25
*/
public class Student {
private Integer no;
private String name;
private Date birthday;
private String email;
public Integer getNo() {
return no;
}
public void setNo(Integer no) {
this.no = no;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public Student() {
super();
}
public Student(Integer no, String name, Date birthday, String email) {
super();
this.no = no;
this.name = name;
this.birthday = birthday;
this.email = email;
}
@Override
public String toString() {
return "Student [no=" + no + ", name=" + name + ", birthday="
+ birthday + ", email=" + email + "]";
}
}教师实体：package com.huey.mybatis.entity;
import java.util.Date;
import java.util.List;
/**
* 教师实体
* @author huey2672
* @version 1.0
* @created 2014-7-26
*/
public class Teacher {
private Integer id;
private String name;
private Date birthday;
private Tel tel;
private List<Course> courses;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public Tel getTel() {
return tel;
}
public void setTel(Tel tel) {
this.tel = tel;
}
public List<Course> getCourses() {
return courses;
}
public void setCourses(List<Course> courses) {
this.courses = courses;
}
public Teacher() {
super();
}
public Teacher(Integer id, String name, Date birthday, Tel tel) {
super();
this.id = id;
this.name = name;
this.birthday = birthday;
this.tel = tel;
}
@Override
public String toString() {
return "Teacher [id=" + id + ", name=" + name + ", birthday="
+ birthday + ", tel=" + tel + "]";
}
}教师实体的Tel属性：package com.huey.mybatis.entity;
/**
* 电话号码，由区号和号码组成
* @author huey2672
* @version 1.0
* @created 2014-7-26
*/
public class Tel {
private String cityCode;
private String number;
public String getCityCode() {
return cityCode;
}
public void setCityCode(String cityCode) {
this.cityCode = cityCode;
}
public String getNumber() {
return number;
}
public void setNumber(String number) {
this.number = number;
}
public Tel() {
super();
}
public Tel(String cityCode, String number) {
super();
this.cityCode = cityCode;
this.number = number;
}
/**
* 用完整的电话号码字符串构造
* @param fullNumber
*/
public Tel(String fullNumber) {
if (fullNumber != null) {
String[] parts = fullNumber.split("-");
if (parts.length > 0) {
cityCode = parts[0];
}
if (parts.length > 1) {
number = parts[1];
}
}
}
public String getFullNumber() {
return cityCode + "-" + number;
}
@Override
public String toString() {
return getFullNumber();
}
}课程实体：package com.huey.mybatis.entity;
/**
* 课程实体
* @author huey2672
* @version 1.0
* @created 2014-7-28
*/
public class Course {
private Integer id;
private String name;
private String description;
private int year;
private Season season;
private Teacher teacher;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public int getYear() {
return year;
}
public void setYear(int year) {
this.year = year;
}
public Season getSeason() {
return season;
}
public void setSeason(Season season) {
this.season = season;
}
public Teacher getTeacher() {
return teacher;
}
public void setTeacher(Teacher teacher) {
this.teacher = teacher;
}
public Course() {
super();
}
public Course(Integer id, String name, String description, int year,
Season season, Teacher teacher) {
super();
this.id = id;
this.name = name;
this.description = description;
this.year = year;
this.season = season;
this.teacher = teacher;
}
@Override
public String toString() {
return "Course [id=" + id + ", name=" + name + ", description="
+ description + ", year=" + year + ", season=" + season
+ (teacher != null ? ", teacher=" + teacher.getName() : "") + "]";
}
}课程实体的季度属性是枚举类型：package com.huey.mybatis.entity;
/**
* 季度枚举
* @author huey2672
* @version 1.0
* @created 2014-7-28
*/
public enum Season {
SPRING,
SUMMER,
AUTUMN,
WINTER;
}3. 在数据表teachers中tel字段是varcha类型，在实体Teacher中tel属性是自定义的JavaBean，需要自定义类型处理器处理：
package com.huey.mybatis.typehandlers;
import java.sql.CallableStatement;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.apache.ibatis.type.BaseTypeHandler;
import org.apache.ibatis.type.JdbcType;
import com.huey.mybatis.entity.Tel;
/**
* 类型处理器TelTypeHandlers，继承BaseTypeHandler<T>
* 当mybatis进行JDBC操作时，将自定义类型Tel转换成数据库中相应的列属性
* 当从SQL结果集构建 JavaBean时，也有类似的过程
* @author huey2672
* @version 1.0
* @created 2014-7-26
*/
public class TelTypeHandler extends BaseTypeHandler<Tel> {
@Override
public Tel getNullableResult(ResultSet rs, String columnName)
throws SQLException {
// 使用rs.getString是tel字段是VARCHER类型
return new Tel(rs.getString(columnName));
}
@Override
public Tel getNullableResult(ResultSet rs, int columnIndex)
throws SQLException {
return new Tel(rs.getString(columnIndex));
}
@Override
public Tel getNullableResult(CallableStatement cs, int columnIndex)
throws SQLException {
return new Tel(cs.getString(columnIndex));
}
@Override
public void setNonNullParameter(PreparedStatement ps, int i,
Tel param, JdbcType jdbcType) throws SQLException {
ps.setString(i, param.getFullNumber());
}
}4. 映射器：
StudentMapper：
package com.huey.mybatis.mapper;
import java.util.List;
import org.apache.ibatis.session.RowBounds;
import com.huey.mybatis.entity.Student;
/**
* 映射器StudentMapper
* 定义了对学生实体的一些基本操作
* @author huey2672
* @version 1.0
* @created 2014-7-25
*/
public interface StudentMapper {
/**
* 添加学生记录
* @param student
* @return 数据库中受影响的行数
*/
public int addStudent(Student student);
/**
* 删除学生记录
* @param studNo
* @return 数据库中受影响的行数
*/
public int deleteStudent(Integer studNo);
/**
* 更新学生记录
* @param student
* @return 数据库中受影响的行数
*/
public int updateStudent(Student student);
/**
* 根据学生学号查询学生记录
* @param studNo
* @return
*/
public Student getStudent(Integer studNo);
/**
* 查询所有学生记录
* @return
*/
public List<Student> getAllStudents();
/**
* 分页查询学生记录
* @param rowBounds
* @return
*/
public List<Student> getAllStudents(RowBounds rowBounds);
}TeacherMapper：package com.huey.mybatis.mapper;
import java.util.List;
import com.huey.mybatis.entity.Teacher;
/**
* 映射器TeacherMapper
* 定义了对教师实体的一些基本操作
* @author huey2672
* @version 1.0
* @created 2014-7-26
*/
public interface TeacherMapper {
/**
* 添加教师记录
* @param teacher
* @return 数据库中受影响的行数
*/
public int addTeacher(Teacher teacher);
/**
* 删除教师记录
* @param tchId
* @return 数据库中受影响的行数
*/
public int deleteTeacher(Integer tchId);
/**
* 更新教师记录
* @param teacher
* @return 数据库中受影响的行数
*/
public int updateTeacher(Teacher teacher);
/**
* 根据教师编号查询教师记录
* @param tchId
* @return
*/
public Teacher getTeacher(Integer tchId);
/**
* 根据教师编号查询教师记录，记录包含该教师的授课信息
* @param tchId
* @return
*/
public Teacher getTeacherWithCourses(Integer tchId);
/**
* 查询所有的教师记录
* @return
*/
public List<Teacher> getAllTeachers();
}CourseMapper：package com.huey.mybatis.mapper;
import java.util.List;
import java.util.Map;
import com.huey.mybatis.entity.Course;
import com.huey.mybatis.entity.Season;
/**
* 映射器CourseMapper
* 定义了对课程实体的一些基本操作
* @author huey2672
* @version 1.0
* @created 2014-7-28
*/
public interface CourseMapper {
/**
* 添加课程记录
* @param course
* @return 数据库中受影响的行数
*/
public int addCourse(Course course);
/**
* 删除课程记录
* @param crsId 要删除课程记录的ID
* @return 数据库中受影响的行数
*/
public int deleteCourse(Integer crsId);
/**
* 更新课程记录
* @param course
* @return 数据库中受影响的行数
*/
public int updateCourse(Course course);
/**
* 根据课程编号查询课程记录
* @param crsId
* @return
*/
public Course getCourse(Integer crsId);
/**
* 查询所有课程记录
* @return
*/
public List<Course> getAllCourses();
/**
* 根据授课教师编号查询课程记录
* @return
*/
public List<Course> queryCoursesByTchId(Integer tchId);
/**
* 根据开课年度和季度查询课程记录
* @param year
* @param season
* @return
*/
public List<Course> queryCoursesByYearAndSeason(int year, Season season);
/**
* 多条件查询课程记录
* @param params
* @return
*/
public List<Course> queryCourses(Map<String, Object> params);
}5. 映射器SQLMapper配置文件：
StudentMapper.xml：
<?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">
<!--注意：此处的命名空间是StudentMapper的全限定类名-->
<mapper namespace="com.huey.mybatis.mapper.StudentMapper">
<!-- cache元素添加全局二级缓存 -->
<!--
eviction定义缓存的移除机制，默认值是LRU(Least Recently Used)
可选值还有FIFO(First In First Out)、SOFT(soft reference)、WEAK(weak reference)
-->
<!--
flushInterval定义缓存刷新间隔，以毫秒计。
默认情况下不设置。所以不使用刷新间隔，缓存cache只有调用语句的时候刷新。
-->
<!-- size定义缓存cache中能容纳的最大元素数。默认值是 1024，可以设置成任意的正整数。 -->
<!--
readOnly定义使用只读缓存还是读/写缓存。默认情况下设置为 false，即使用读/写缓存。
一个只读缓存 ache会对所有的调用者返回被缓存对象的同一个实例（实际返回的是被返回对象的一份引用）。
一个读/写缓存cache将会返回被返回对象的一分拷贝（通过序列化）。
-->
<cache eviction="FIFO" flushInterval="60000" size="512" readOnly="true"/>
<!-- ResultMaps被用来将 SQL SELECT语句的结果集映射到JavaBeans的属性中 -->
<resultMap type="Student" id="studentMap">
<!-- 映射主键 -->
<id property="no" column="stud_no" />
<!-- 映射普通字段 -->
<result property="name" column="stud_name"/>
<result property="birthday" column="birthday"/>
<result property="email" column="email"/>
</resultMap>
<!-- 添加学生记录 -->
<!-- id名称需要与StudentMapper中的方法签名一致 -->
<!-- Student这一别名在mybatis-config.xml中配置 -->
<insert id="addStudent" parameterType="Student">
insert into students(stud_no, stud_name, birthday, email)
values(#{no}, #{name}, #{birthday}, #{email})
</insert>
<!-- 删除学生记录 -->
<delete id="deleteStudent" parameterType="int">
delete from students where stud_no=#{studNo}
</delete>
<!-- 更新学生记录 -->
<update id="updateStudent" parameterType="Student">
update students
set stud_name=#{name}, birthday=#{birthday}, email=#{email}
where stud_no=#{no}
</update>
<!-- 根据学生学号查询学生记录 -->
<!--
MyBatis自动对JavaBean中和列名匹配的属性进行填充。
如果使用resultType="Student"，那么no和name属性无法被填充，
这是因为JavaBean中的属性名与数据库中的列名不匹配。
也可以选择在select语句中为列名去与JavaBean属性名一致的别名。
-->
<select id="getStudent" parameterType="int" resultMap="studentMap" >
select * from students where stud_no=#{studNo}
</select>
<!-- 查询所有学生记录 -->
<select id="getAllStudents" resultMap="studentMap">
select * from students
</select>
</mapper>TeacherMapper.xml：<?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">
<!--注意：此处的命名空间是TeacherMapper的全限定类名-->
<mapper namespace="com.huey.mybatis.mapper.TeacherMapper">
<resultMap type="Course" id="courseMap">
<id property="id" column="crs_id" />
<result property="name" column="crs_name"/>
<result property="description" column="description"/>
<result property="year" column="crs_year" />
<result property="season" column="crs_season" />
</resultMap>
<!-- ResultMaps被用来将 SQL SELECT语句的结果集映射到JavaBeans的属性中 -->
<resultMap type="Teacher" id="teacherMap">
<!-- 映射主键 -->
<id property="id" column="tch_id" />
<!-- 映射普通字段 -->
<result property="name" column="tch_name"/>
<result property="birthday" column="birthday"/>
<result property="tel" column="tel"/>
<!-- collection引用了同在一个xml文件中的courseMap，导入了one-to-many类型的关联 -->
<collection property="courses" resultMap="courseMap" />
</resultMap>
<!-- 添加教师记录 -->
<!-- id名称需要与TeacherMapper中的方法签名一致 -->
<!-- Student这一别名在mybatis-config.xml中配置 -->
<insert id="addTeacher" parameterType="Teacher">
insert into teachers(tch_id, tch_name, birthday, tel)
values(#{id}, #{name}, #{birthday}, #{tel})
</insert>
<!-- 删除教师记录 -->
<delete id="deleteTeacher" parameterType="int">
delete from teachers where tch_id=#{tchId}
</delete>
<!-- 更新教师记录 -->
<update id="updateTeacher" parameterType="Teacher">
update teachers
set tch_name=#{name}, birthday=#{birthday}, tel=#{tel}
where tch_id=#{id}
</update>
<!-- 根据教师编号查询教师记录 -->
<select id="getTeacher" parameterType="int" resultMap="teacherMap">
select * from teachers where tch_id=#{id}
</select>
<!-- 根据教师编号查询教师记录，记录包含该教师的授课信息 -->
<select id="getTeacherWithCourses" parameterType="int" resultMap="teacherMap">
select t.tch_id, tch_name, birthday, tel, crs_id, crs_name, description, crs_year, crs_season
from teachers t, courses c
where t.tch_id = c.tch_id
and t.tch_id = #{id}
</select>
<!-- 查询所有教师记录 -->
<select id="getAllTeachers" resultMap="teacherMap">
select * from teachers
</select>
</mapper>CourseMapper.xml：<?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="com.huey.mybatis.mapper.CourseMapper">
<resultMap type="Teacher" id="teacherMap">
<id property="id" column="tch_id" />
<result property="name" column="tch_name"/>
<result property="birthday" column="birthday"/>
<result property="tel" column="tel"/>
</resultMap>
<resultMap type="Course" id="courseMap">
<id property="id" column="crs_id" />
<result property="name" column="crs_name"/>
<result property="description" column="description"/>
<result property="year" column="crs_year" />
<!--
默认情况下， MyBatis使用 EnumTypeHandler来处理enum类型的Java属性，并且将其存储为enum值的名称。
不需要为此做任何额外的配置。
-->
<result property="season" column="crs_season" />
<!-- association引用了同在一个xml文件中的teacherMap，导入了has-one类型的关联 -->
<association property="teacher" resultMap="teacherMap" />
</resultMap>
<!-- 定义可重用的 SQL代码段，可以包含在其他语句中 -->
<sql id="courseColumnsWithTeacher">
crs_id, crs_name, description, crs_year, crs_season, t.tch_id, tch_name, birthday, tel
</sql>
<!-- 添加课程记录 -->
<insert id="addCourse" parameterType="Course">
insert into courses(crs_id, crs_name, description, crs_year, crs_season, tch_id)
values(#{id}, #{name}, #{description}, #{year}, #{season}, #{teacher.id})
</insert>
<!-- 删除课程记录 -->
<delete id="deleteCourse" parameterType="int">
delete from courses where crs_id=#{crsId}
</delete>
<!-- 更新课程记录 -->
<update id="updateCourse" parameterType="Course">
update courses
set crs_name=#{name}, description=#{description}, tch_id=#{teacher.id}
where crs_id=#{id}
</update>
<!-- 根据课程编号查询课程记录 -->
<select id="getCourse" parameterType="int" resultMap="courseMap" >
<!-- 引用sql代码段 -->
select <include refid="courseColumnsWithTeacher"/>
from courses c, teachers t
where c.tch_id = t.tch_id
and crs_id=#{crsId}
</select>
<!-- 查询所有课程记录 -->
<select id="getAllCourses" resultMap="courseMap">
select <include refid="courseColumnsWithTeacher"/>
from courses c, teachers t
where c.tch_id = t.tch_id
</select>
<!-- 根据授课教师编号查询课程记录 -->
<select id="queryCoursesByTchId" parameterType="int" resultMap="courseMap">
select crs_id, crs_name, description, crs_year, crs_season, t.tch_id, tch_name, birthday, tel
from courses c, teachers t
where c.tch_id = t.tch_id
and t.tch_id = #{tchId}
</select>
<!-- 根据开课年度和季度查询课程记录 -->
<!-- MyBatis支持将多个输入参数传递给映射语句，并以#{param}的语法形式引用它们 -->
<select id="queryCoursesByYearAndSeason" resultMap="courseMap">
select <include refid="courseColumnsWithTeacher"/>
from courses c, teachers t
where c.tch_id = t.tch_id
and crs_year = #{param1}
and crs_season = #{param2}
</select>
<!-- 多条件查询课程记录 -->
<!-- 动态SQL -->
<select id="queryCourses" parameterType="map" resultMap="courseMap">
select <include refid="courseColumnsWithTeacher"/>
from courses c, teachers t
where c.tch_id = t.tch_id
<if test="crsName!=null">
and crs_name like #{crsName}
</if>
<if test="year!=null">
and crs_year = #{year}
</if>
<if test="season!=null">
and crs_season = #{season}
</if>
</select>
</mapper>6. 数据库连接属性配置jdbc.properties：
jdbc.driverClassName=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/mybatis jdbc.username=root jdbc.password=root
7. 配置文件mybatis-config.xml：
<?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元素可以将配置值具体化到一个属性文件中，并且使用属性文件的key名作为占位符 -->
<properties resource="jdbc.properties">
</properties>
<!-- 设置别名 -->
<typeAliases>
<typeAlias type="com.huey.mybatis.entity.Student" alias="Student" />
<typeAlias type="com.huey.mybatis.entity.Teacher" alias="Teacher" />
<typeAlias type="com.huey.mybatis.entity.Course" alias="Course" />
</typeAliases>
<!-- 注册自定义类型处理器 -->
<typeHandlers>
<typeHandler handler="com.huey.mybatis.typehandlers.TelTypeHandler" />
</typeHandlers>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC" />
<!-- 配置数据源 -->
<dataSource type="POOLED">
<property name="driver" value="${jdbc.driverClassName}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
</dataSource>
</environment>
</environments>
<!-- mapper对应的xml配置文件 -->
<mappers>
<mapper resource="com/huey/mybatis/mapper/StudentMapper.xml" />
<mapper resource="com/huey/mybatis/mapper/TeacherMapper.xml" />
<mapper resource="com/huey/mybatis/mapper/CourseMapper.xml" />
</mappers>
</configuration>8. 工具类MyBatisUtil：
package com.huey.mybatis.utils;
import java.io.InputStream;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
/**
* Mybatis工具类，主要负责创建、获取SqlSessionFactory实例
* @author huey2672
* @version 1.0
* @created 2014-7-25
*/
public class MybatisUtil {
private static SqlSessionFactory sessionFactory;
private static InputStream inputStream;
/**
* 加载mybatis-config.xml，创建SqlSessionFactory实例
*/
static {
try {
inputStream = Resources.getResourceAsStream("mybatis-config.xml");
sessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 每个数据库环境应该就只有一个SqlSessionFactory对象实例
* 所以使用单例模式只创建一个SqlSessionFactory实例
* @return
*/
public static SqlSessionFactory getSqlSessionFactory() {
return sessionFactory;
}
}9. 业务逻辑层接口：
StudentServ：
package com.huey.mybatis.serv;
import java.util.List;
import com.huey.mybatis.entity.Student;
/**
* 业务逻辑层接口StudentServ
* @author huey2672
* @version 1.0
* @created 2014-7-25
*/
public interface StudentServ {
/**
* 添加学生记录
* @param student
* @return 实际添加学生记录的数量
*/
public int addStudent(Student student);
/**
* 删除学生记录
* @param studNo
* @return 实际删除学生记录的数量
*/
public int deleteStudent(Integer studNo);
/**
* 更新学生记录
* @param student
* @return 实际更新学生记录的数量
*/
public int updateStudent(Student student);
/**
* 根据学生学号查询学生记录
* @param studNo
* @return
*/
public Student getStudent(Integer studNo);
/**
* 查询所有学生记录
* @return
*/
public List<Student> getAllStudents();
/**
* 分页查询学生记录
* @param pageIndex 页码，第一页的页码为1
* @param pageSize 每页记录数
* @return
*/
public List<Student> pagingQueryStudents(int pageIndex, int pageSize);
}TeacherServ：package com.huey.mybatis.serv;
import java.util.List;
import com.huey.mybatis.entity.Teacher;
/**
* 业务逻辑层接口TeacherServ
* @author huey2672
* @version 1.0
* @created 2014-7-26
*/
public interface TeacherServ {
/**
* 添加教师记录
* @param teacher
* @return 实际添加教师记录的数量
*/
public int addTeacher(Teacher teacher);
/**
* 删除教师记录
* @param tchId
* @return 实际删除教师记录的数量
*/
public int deleteTeacher(Integer tchId);
/**
* 更新教师记录
* @param teacher
* @return 实际更新教师记录的数量
*/
public int updateTeacher(Teacher teacher);
/**
* 根据教师编号查询教师记录
* @param tchId
* @return
*/
public Teacher getTeacher(Integer tchId);
/**
* 根据教师编号查询教师记录，记录包含该教师的授课信息
* @param tchId
* @return
*/
public Teacher getTeacherWithCourses(Integer tchId);
/**
* 查询所有的教师记录
* @return
*/
public List<Teacher> getAllTeachers();
}CourseServ：package com.huey.mybatis.serv;
import java.util.List;
import com.huey.mybatis.entity.Course;
import com.huey.mybatis.entity.Season;
/**
* 业务逻辑层接口CourseServ
* @author huey2672
* @version 1.0
* @created 2014-7-28
*/
public interface CourseServ {
/**
* 添加课程记录
* @param course
* @return 数据库中受影响的行数
*/
public int addCourse(Course course);
/**
* 删除课程记录
* @param crsId 要删除课程记录的ID
* @return 数据库中受影响的行数
*/
public int deleteCourse(Integer crsId);
/**
* 更新课程记录
* @param course
* @return 数据库中受影响的行数
*/
public int updateCourse(Course course);
/**
* 根据课程ID查询课程记录
* @param crsId
* @return
*/
public Course getCourse(Integer crsId);
/**
* 查询所有课程记录
* @return
*/
public List<Course> getAllCourses();
/**
* 根据授课教师编号查询课程记录
* @return
*/
public List<Course> queryCoursesByTchId(Integer tchId);
/**
* 根据开课年度和季度查询课程记录
* @param year
* @param season
* @return
*/
public List<Course> queryCoursesByYearAndSeason(int year, Season season);
/**
* 多条件查询课程记录
* @param crsName
* @param year
* @param season
* @return
*/
public List<Course> queryCourses(String crsName, int year, Season season);
}10. 业务逻辑层实现：
StudentServImpl：
package com.huey.mybatis.serv.impl;
import java.util.ArrayList;
import java.util.List;
import org.apache.ibatis.session.RowBounds;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import com.huey.mybatis.entity.Student;
import com.huey.mybatis.mapper.StudentMapper;
import com.huey.mybatis.serv.StudentServ;
import com.huey.mybatis.utils.MybatisUtil;
/**
* 业务逻辑层实现StudentServImpl
* @author huey2672
* @version 1.0
* @created 2014-7-25
*/
public class StudentServImpl implements StudentServ {
private SqlSessionFactory sessionFactory = MybatisUtil.getSqlSessionFactory();
@Override
public int addStudent(Student student) {
/**
* 每一个线程应该有它自己的SqlSession实例。
* SqlSession对象实例不是线程安全的，并且不被共享。
* 所以SqlSession的作用域最好就是其所在方法的作用域。
* 从Web应用程序角度上看，SqlSession应该存在于request级别作用域上。
*/
SqlSession session = sessionFactory.openSession();
int count = 0;
try {
// 获取mapper
StudentMapper studentMapper = session.getMapper(StudentMapper.class);
//
count = studentMapper.addStudent(student);
// 提交事务
session.commit();
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭资源
session.close();
}
return count;
}
@Override
public int deleteStudent(Integer studNo) {
SqlSession session = sessionFactory.openSession();
int count = 0;
try {
StudentMapper studentMapper = session.getMapper(StudentMapper.class);
count = studentMapper.deleteStudent(studNo);
session.commit();
} catch (Exception e) {
e.printStackTrace();
} finally {
session.close();
}
return count;
}
@Override
public int updateStudent(Student student) {
SqlSession session = sessionFactory.openSession();
int count = 0;
try {
StudentMapper studentMapper = session.getMapper(StudentMapper.class);
count = studentMapper.updateStudent(student);
session.commit();
} catch (Exception e) {
e.printStackTrace();
} finally {
session.close();
}
return count;
}
@Override
public Student getStudent(Integer studNo) {
SqlSession session = sessionFactory.openSession();
Student student = null;
try {
StudentMapper studentMapper = session.getMapper(StudentMapper.class);
student = studentMapper.getStudent(studNo);
} catch (Exception e) {
e.printStackTrace();
} finally {
session.close();
}
return student;
}
@Override
public List<Student> getAllStudents() {
SqlSession session = sessionFactory.openSession();
List<Student> students = new ArrayList<Student>();
try {
StudentMapper studentMapper = session.getMapper(StudentMapper.class);
students = studentMapper.getAllStudents();
} catch (Exception e) {
e.printStackTrace();
} finally {
session.close();
}
return students;
}
@Override
public List<Student> pagingQueryStudents(int pageIndex, int pageSize) {
SqlSession session = sessionFactory.openSession();
List<Student> students = new ArrayList<Student>();
try {
StudentMapper studentMapper = session.getMapper(StudentMapper.class);
// offset表示开始位置
int offset = (pageIndex - 1) * pageSize;
// limit表示要取的记录的数目
int limit = pageSize;
students = studentMapper.getAllStudents(new RowBounds(offset, limit));
} catch (Exception e) {
e.printStackTrace();
} finally {
session.close();
}
return students;
}
}TeacherServImpl：package com.huey.mybatis.serv.impl;
import java.util.ArrayList;
import java.util.List;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import com.huey.mybatis.entity.Teacher;
import com.huey.mybatis.mapper.TeacherMapper;
import com.huey.mybatis.serv.TeacherServ;
import com.huey.mybatis.utils.MybatisUtil;
/**
* 业务逻辑层实现TeacherServImpl
* @author huey2672
* @version 1.0
* @created 2014-7-26
*/
public class TeacherServImpl implements TeacherServ {
private SqlSessionFactory sessionFactory = MybatisUtil.getSqlSessionFactory();
@Override
public int addTeacher(Teacher teacher) {
SqlSession session = sessionFactory.openSession();
int count = 0;
try {
// 获取mapper
TeacherMapper teacherMapper = session.getMapper(TeacherMapper.class);
//
count = teacherMapper.addTeacher(teacher);
// 提交事务
session.commit();
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭资源
session.close();
}
return count;
}
@Override
public int deleteTeacher(Integer tchId) {
SqlSession session = sessionFactory.openSession();
int count = 0;
try {
TeacherMapper teacherMapper = session.getMapper(TeacherMapper.class);
count = teacherMapper.deleteTeacher(tchId);
session.commit();
} catch (Exception e) {
e.printStackTrace();
} finally {
session.close();
}
return count;
}
@Override
public int updateTeacher(Teacher teacher) {
SqlSession session = sessionFactory.openSession();
int count = 0;
try {
TeacherMapper teacherMapper = session.getMapper(TeacherMapper.class);
count = teacherMapper.updateTeacher(teacher);
session.commit();
} catch (Exception e) {
e.printStackTrace();
} finally {
session.close();
}
return count;
}
@Override
public Teacher getTeacher(Integer tchId) {
SqlSession session = sessionFactory.openSession();
Teacher teacher = null;
try {
TeacherMapper teacherMapper = session.getMapper(TeacherMapper.class);
teacher = teacherMapper.getTeacher(tchId);
} catch (Exception e) {
e.printStackTrace();
} finally {
session.close();
}
return teacher;
}
@Override
public Teacher getTeacherWithCourses(Integer tchId) {
SqlSession session = sessionFactory.openSession();
Teacher teacher = null;
try {
TeacherMapper teacherMapper = session.getMapper(TeacherMapper.class);
teacher = teacherMapper.getTeacherWithCourses(tchId);
} catch (Exception e) {
e.printStackTrace();
} finally {
session.close();
}
return teacher;
}
@Override
public List<Teacher> getAllTeachers() {
SqlSession session = sessionFactory.openSession();
List<Teacher> teachers = new ArrayList<Teacher>();
try {
TeacherMapper teacherMapper = session.getMapper(TeacherMapper.class);
teachers = teacherMapper.getAllTeachers();
} catch (Exception e) {
e.printStackTrace();
} finally {
session.close();
}
return teachers;
}
}CourseServImpl：package com.huey.mybatis.serv.impl;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import com.huey.mybatis.entity.Course;
import com.huey.mybatis.entity.Season;
import com.huey.mybatis.mapper.CourseMapper;
import com.huey.mybatis.serv.CourseServ;
import com.huey.mybatis.utils.MybatisUtil;
/**
* 业务逻辑层实现CourseServImpl
* @author huey2672
* @version 1.0
* @created 2014-7-28
*/
public class CourseServImpl implements CourseServ {
private SqlSessionFactory sessionFactory = MybatisUtil.getSqlSessionFactory();
@Override
public int addCourse(Course course) {
SqlSession session = sessionFactory.openSession();
int count = 0;
try {
CourseMapper courseMapper = session.getMapper(CourseMapper.class);
count = courseMapper.addCourse(course);
session.commit();
} catch (Exception e) {
e.printStackTrace();
} finally {
session.close();
}
return count;
}
@Override
public int deleteCourse(Integer crsId) {
SqlSession session = sessionFactory.openSession();
int count = 0;
try {
CourseMapper courseMapper = session.getMapper(CourseMapper.class);
count = courseMapper.deleteCourse(crsId);
session.commit();
} catch (Exception e) {
e.printStackTrace();
} finally {
session.close();
}
return count;
}
@Override
public int updateCourse(Course course) {
SqlSession session = sessionFactory.openSession();
int count = 0;
try {
CourseMapper courseMapper = session.getMapper(CourseMapper.class);
count = courseMapper.updateCourse(course);
session.commit();
} catch (Exception e) {
e.printStackTrace();
} finally {
session.close();
}
return count;
}
@Override
public Course getCourse(Integer crsId) {
SqlSession session = sessionFactory.openSession();
Course course = null;
try {
CourseMapper courseMapper = session.getMapper(CourseMapper.class);
course = courseMapper.getCourse(crsId);
} catch (Exception e) {
e.printStackTrace();
} finally {
session.close();
}
return course;
}
@Override
public List<Course> getAllCourses() {
SqlSession session = sessionFactory.openSession();
List<Course> courses = new ArrayList<Course>();
try {
CourseMapper courseMapper = session.getMapper(CourseMapper.class);
courses = courseMapper.getAllCourses();
} catch (Exception e) {
e.printStackTrace();
} finally {
session.close();
}
return courses;
}
@Override
public List<Course> queryCoursesByTchId(Integer tchId) {
SqlSession session = sessionFactory.openSession();
List<Course> courses = new ArrayList<Course>();
try {
CourseMapper courseMapper = session.getMapper(CourseMapper.class);
courses = courseMapper.queryCoursesByTchId(tchId);
} catch (Exception e) {
e.printStackTrace();
} finally {
session.close();
}
return courses;
}
@Override
public List<Course> queryCoursesByYearAndSeason(int year, Season season) {
SqlSession session = sessionFactory.openSession();
List<Course> courses = new ArrayList<Course>();
try {
CourseMapper courseMapper = session.getMapper(CourseMapper.class);
courses = courseMapper.queryCoursesByYearAndSeason(year, season);
} catch (Exception e) {
e.printStackTrace();
} finally {
session.close();
}
return courses;
}
@Override
public List<Course> queryCourses(String crsName, int year, Season season) {
SqlSession session = sessionFactory.openSession();
List<Course> courses = new ArrayList<Course>();
try {
CourseMapper courseMapper = session.getMapper(CourseMapper.class);
Map<String, Object> params = new HashMap<String, Object>();
params.put("crsName", "%" + crsName + "%");
params.put("year", year);
params.put("season", season);
courses = courseMapper.queryCourses(params);
} catch (Exception e) {
e.printStackTrace();
} finally {
session.close();
}
return courses;
}
}11. log4j.properties配置：
log4j.rootLogger=debug, Console #Console log4j.appender.Console=org.apache.log4j.ConsoleAppender log4j.appender.Console.layout=org.apache.log4j.PatternLayout log4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n log4j.logger.java.sql.ResultSet=DEBUG log4j.logger.org.apache=DEBUG log4j.logger.java.sql.Connection=DEBUG log4j.logger.java.sql.Statement=DEBUG log4j.logger.java.sql.PreparedStatement=DEBUG
12. 单元测试：
StudentServImplTest：
package com.huey.mybatis.serv.impl;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import org.junit.Test;
import com.huey.mybatis.entity.Student;
import com.huey.mybatis.serv.StudentServ;
import com.huey.mybatis.serv.impl.StudentServImpl;
/**
* 单元测试类StudentServTest
* 用于测试StudentServImpl中的方法
* @author huey2672
* @version 1.0
* @created 2014-7-25
*/
public class StudentServImplTest {
StudentServ studentServ = new StudentServImpl();
/**
* 测试addStudent方法
* @throws Exception
*/
@Test
public void testAddStudent() throws Exception {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date birthday = sdf.parse("1900-01-01");
Student student = new Student(10007, "孙悟空", birthday, "monkey@gamil.com");
int result = studentServ.addStudent(student);
System.out.println("result = " + result);
}
/**
* 测试deleteStudent方法
* @throws Exception
*/
@Test
public void testDeleteStudent() throws Exception {
int studNo = 10001;
int result = studentServ.deleteStudent(studNo);
System.out.println("result = " + result);
}
/**
* 测试updateStudent方法
* @throws Exception
*/
@Test
public void testUpdateStudent() throws Exception {
int studNo = 10001;
Student student = studentServ.getStudent(studNo);
if (student != null) {
student.setEmail("zhangsan@gmail.com");
int result = studentServ.updateStudent(student);
System.out.println("result = " + result);
} else {
System.out.println("查询不到该学生记录");
}
}
/**
* 测试getStudent方法
* @throws Exception
*/
@Test
public void testGetStudent() throws Exception {
int studNo = 10001;
Student student = studentServ.getStudent(studNo);
System.out.println(student);
}
/**
* 测试getAllStudents方法
* @throws Exception
*/
@Test
public void testGetAllStudents() throws Exception {
List<Student> students = studentServ.getAllStudents();
for (Student student : students) {
System.out.println(student);
}
}
@Test
public void testPagingQueryStudents() throws Exception {
int pageIndex = 2;
int pageSize = 4;
List<Student> students = studentServ.pagingQueryStudents(pageIndex, pageSize);
for (Student student : students) {
System.out.println(student);
}
}
}TeacherServImplTest：package com.huey.mybatis.serv.impl;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import org.junit.Test;
import com.huey.mybatis.entity.Course;
import com.huey.mybatis.entity.Teacher;
import com.huey.mybatis.entity.Tel;
import com.huey.mybatis.serv.TeacherServ;
/**
* 单元测试类TeacherServImplTest
* 用于测试TeacherServImpl中的方法
* @author huey2672
* @version 1.0
* @created 2014-7-26
*/
public class TeacherServImplTest {
TeacherServ teacherServ = new TeacherServImpl();
/**
* 测试addTeacher方法
* @throws Exception
*/
@Test
public void testAddTeacher() throws Exception {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date birthday = sdf.parse("1977-07-07");
Teacher teacher = new Teacher(10003, "孔子", birthday, new Tel("021-12345"));
int result = teacherServ.addTeacher(teacher);
System.out.println("result = " + result);
}
/**
* 测试deleteTeacher方法
* @throws Exception
*/
@Test
public void testDeleteTeacher() throws Exception {
int tchId = 10001;
int result = teacherServ.deleteTeacher(tchId);
System.out.println("result = " + result);
}
/**
* 测试updateTeacher方法
* @throws Exception
*/
@Test
public void testUpdateTeacher() throws Exception {
int tchId = 10001;
Teacher teacher = teacherServ.getTeacher(tchId);
if (teacher != null) {
teacher.setTel(new Tel("010-55555"));
int result = teacherServ.updateTeacher(teacher);
System.out.println("result = " + result);
} else {
System.out.println("查询不到该教师记录");
}
}
/**
* 测试getTeacher方法
* @throws Exception
*/
@Test
public void testGetTeacher() throws Exception {
int tchId = 10001;
Teacher teacher = teacherServ.getTeacher(tchId);
System.out.println(teacher);
}
@Test
public void testGeTeacherWithCourses() throws Exception {
int tchId = 10001;
Teacher teacher = teacherServ.getTeacherWithCourses(tchId);
System.out.println(teacher);
for (Course course : teacher.getCourses()) {
System.out.println(course);
}
}
/**
* 测试getAllTeachers方法
* @throws Exception
*/
@Test
public void testGetAllTeachers() throws Exception {
List<Teacher> teachers = teacherServ.getAllTeachers();
for (Teacher teacher : teachers) {
System.out.println(teacher);
}
}
}CourseServImplTest：package com.huey.mybatis.serv.impl;
import java.util.List;
import org.junit.Test;
import com.huey.mybatis.entity.Course;
import com.huey.mybatis.entity.Season;
import com.huey.mybatis.entity.Teacher;
import com.huey.mybatis.serv.CourseServ;
import com.huey.mybatis.serv.TeacherServ;
/**
* 单元测试类CourseServImplTest
* 用于测试CourseServImpl中的方法
* @author huey2672
* @version 1.0
* @created 2014-7-28
*/
public class CourseServImplTest {
CourseServ courseServ = new CourseServImpl();
TeacherServ teacherServ = new TeacherServImpl();
/**
* 测试addCourse方法
* @throws Exception
*/
@Test
public void testAddCourse() throws Exception {
Integer tchId = 10003;
Teacher teacher = teacherServ.getTeacher(tchId);
Course course = new Course(10005, "AJAX", "Asynchronous Javascript + XML",
2014, Season.SPRING, teacher);
int result = courseServ.addCourse(course);
System.out.println("result = " + result);
}
/**
* 测试deleteCourse方法
* @throws Exception
*/
@Test
public void testDeleteCourse() throws Exception {
int crsId = 10001;
int result = courseServ.deleteCourse(crsId);
System.out.println("result = " + result);
}
/**
* 测试updateCourse方法
* @throws Exception
*/
@Test
public void testUpdateCourse() throws Exception {
int crsId = 10001;
Course course = courseServ.getCourse(crsId);
if (course != null) {
course.setName("SQL");
course.setDescription("Structured Query Language");
int result = courseServ.updateCourse(course);
System.out.println("result = " + result);
} else {
System.out.println("查询不到该课程记录");
}
}
/**
* 测试getCourse方法
* @throws Exception
*/
@Test
public void testGetCourse() throws Exception {
int crsId = 10004;
Course course = courseServ.getCourse(crsId);
System.out.println(course);
}
/**
* 测试getAllCourses方法
* @throws Exception
*/
@Test
public void testGetAllCourses() throws Exception {
List<Course> courses = courseServ.getAllCourses();
for (Course course : courses) {
System.out.println(course);
}
}
/**
* 测试queryCoursesByTchId方法
* @throws Exception
*/
@Test
public void testQueryCoursesByTchId() throws Exception {
int tchId = 10002;
List<Course> courses = courseServ.queryCoursesByTchId(tchId);
for (Course course : courses) {
System.out.println(course);
}
}
/**
* 测试queryCoursesByYearAndSeason方法
* @throws Exception
*/
@Test
public void testQueryCoursesByYearAndSeason() throws Exception {
int year = 2014;
Season season = Season.SPRING;
List<Course> courses = courseServ.queryCoursesByYearAndSeason(year, season);
for (Course course : courses) {
System.out.println(course);
}
}
/**
* 测试queryCourses方法
* @throws Exception
*/
@Test
public void testQueryCourses() throws Exception {
String crsName = "Java";
int year = 2013;
Season season = null;
List<Course> courses = courseServ.queryCourses(crsName, year, season);
for (Course course : courses) {
System.out.println(course);
}
}
}
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