MyBatis 教程02
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<!-- \src\com\java1234\mappers\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"> <mapper namespace="com.java1234.mappers.StudentMapper"> <!-- 1,size:表示缓存cache中能容纳的最大元素数。默认是1024; 2,flushInterval:定义缓存刷新周期,以毫秒计; 3,eviction:定义缓存的移除机制;默认是LRU(least recently userd,最近最少使用),还有FIFO(first in first out,先进先出) 4,readOnly:默认值是false,假如是true的话,缓存只能读。 --> <cache size="1024" flushInterval="60000" eviction="LRU" readOnly="false"/> <resultMap type="Student" id="StudentResult"> <id property="id" column="id"/> <result property="name" column="name"/> <result property="age" column="age"/> </resultMap> <select id="findStudents" resultMap="StudentResult" flushCache="false" useCache="true"> select * from t_student </select> <select id="findStudents2" parameterType="Map" resultMap="StudentResult"> select * from t_student <if test="start!=null and size!=null"> limit #{start},#{size} </if> </select> <insert id="insertStudent" parameterType="Student" flushCache="true"> insert into t_student values(null,#{name},#{age},#{pic},#{remark}); </insert> <select id="getStudentById" parameterType="Integer" resultType="Student"> select * from t_student where id=#{id} </select> <select id="searchStudents6" resultMap="StudentResult"> select * from t_student where name like #{param1} and age=#{param2} </select> <select id="searchStudents" parameterType="Map" resultMap="StudentResult"> select * from t_student where gradeId=#{gradeId} <if test="name!=null"> and name like #{name} </if> <if test="age!=nulll"> and age=#{age} </if> </select> <select id="searchStudents2" parameterType="Map" resultMap="StudentResult"> select * from t_student <choose> <when test="searchBy==‘gradeId‘"> where gradeId=#{gradeId} </when> <when test="searchBy==‘name‘"> where name like #{name} </when> <otherwise> where age=#{age} </otherwise> </choose> </select> <select id="searchStudents3" parameterType="Map" resultMap="StudentResult"> select * from t_student <where> <if test="gradeId!=null"> gradeId=#{gradeId} </if> <if test="name!=null"> and name like #{name} </if> <if test="age!=nulll"> and age=#{age} </if> </where> </select> <select id="searchStudents4" parameterType="Map" resultMap="StudentResult"> select * from t_student <trim prefix="where" prefixOverrides="and|or"> <if test="gradeId!=null"> gradeId=#{gradeId} </if> <if test="name!=null"> and name like #{name} </if> <if test="age!=nulll"> and age=#{age} </if> </trim> </select> <select id="searchStudents5" parameterType="Map" resultMap="StudentResult"> select * from t_student <if test="gradeIds!=null"> <where> gradeId in <foreach item="gradeId" collection="gradeIds" open="(" separator="," close=")"> #{gradeId} </foreach> </where> </if> </select> <update id="updateStudent" parameterType="Student"> update t_student <set> <if test="name!=null"> name=#{name}, </if> <if test="age!=null"> age=#{age}, </if> </set> where id=#{id} </update> </mapper> <!-- \src\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 resource="jdbc.properties"/> <typeAliases> <package name="com.java1234.model"/> </typeAliases> <environments default="development"> <environment id="development"> <transactionManager type="JDBC" /> <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> <environment id="test"> <transactionManager type="JDBC" /> <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> <mappers> <package name="com.java1234.mappers"/> </mappers> </configuration>
# \src\jdbc.properties jdbc.driverClassName=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/db_mybatis jdbc.username=root jdbc.password=123456 # \src\log4j.properties log4j.rootLogger=info,appender1,appender2 log4j.appender.appender1=org.apache.log4j.ConsoleAppender log4j.appender.appender2=org.apache.log4j.FileAppender log4j.appender.appender2.File=C:/logFile.txt log4j.appender.appender1.layout=org.apache.log4j.TTCCLayout log4j.appender.appender2.layout=org.apache.log4j.TTCCLayout
// \src\com\java1234\mappers\StudentMapper.java package com.java1234.mappers; import java.util.List; import java.util.Map; import org.apache.ibatis.session.RowBounds; import com.java1234.model.Student; public interface StudentMapper { public List<Student> searchStudents(Map<String,Object> map); public List<Student> searchStudents2(Map<String,Object> map); public List<Student> searchStudents3(Map<String,Object> map); public List<Student> searchStudents4(Map<String,Object> map); public List<Student> searchStudents5(Map<String,Object> map); public List<Student> searchStudents6(String name,int age); public int updateStudent(Student student); public int insertStudent(Student student); public Student getStudentById(Integer id); public List<Student> findStudents(RowBounds rowBounds); public List<Student> findStudents2(Map<String,Object> map); } // \src\com\java1234\model\Student.java package com.java1234.model; public class Student { private Integer id; private String name; private Integer age; private byte[] pic; private String remark; public Student() { super(); // TODO Auto-generated constructor stub } public Student(Integer id, String name, Integer age) { super(); this.id = id; this.name = name; this.age = age; } public Student(String name, Integer age) { super(); this.name = name; this.age = age; } 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 Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } public byte[] getPic() { return pic; } public void setPic(byte[] pic) { this.pic = pic; } public String getRemark() { return remark; } public void setRemark(String remark) { this.remark = remark; } @Override public String toString() { return "Student [id=" + id + ", name=" + name + ", age=" + age + ", remark=" + remark + "]"; } } // \src\com\java1234\service\StudentTest.java package com.java1234.service; 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.log4j.Logger; import org.junit.After; import org.junit.Before; import org.junit.Test; import com.java1234.mappers.StudentMapper; import com.java1234.model.Student; import com.java1234.util.SqlSessionFactoryUtil; public class StudentTest { private static Logger logger=Logger.getLogger(StudentTest.class); private SqlSession sqlSession=null; private StudentMapper studentMapper=null; /** * 测试方法前调用 * @throws Exception */ @Before public void setUp() throws Exception { sqlSession=SqlSessionFactoryUtil.openSession(); studentMapper=sqlSession.getMapper(StudentMapper.class); } /** * 测试方法后调用 * @throws Exception */ @After public void tearDown() throws Exception { sqlSession.close(); } @Test public void testSearchStudents() { logger.info("添加学生(带条件)"); Map<String,Object> map=new HashMap<String,Object>(); map.put("gradeId", 2); // map.put("name", "%李%"); // map.put("age", 11); List<Student> studentList=studentMapper.searchStudents(map); for(Student student:studentList){ System.out.println(student); } } @Test public void testSearchStudents2() { logger.info("添加学生(带条件)"); Map<String,Object> map=new HashMap<String,Object>(); map.put("searchBy", "age"); map.put("gradeId", 2); map.put("name", "%李%"); map.put("age", 11); List<Student> studentList=studentMapper.searchStudents2(map); for(Student student:studentList){ System.out.println(student); } } @Test public void testSearchStudents3() { logger.info("添加学生(带条件)"); Map<String,Object> map=new HashMap<String,Object>(); map.put("gradeId", 2); map.put("name", "%李%"); map.put("age", 11); List<Student> studentList=studentMapper.searchStudents3(map); for(Student student:studentList){ System.out.println(student); } } @Test public void testSearchStudents4() { logger.info("添加学生(带条件)"); Map<String,Object> map=new HashMap<String,Object>(); map.put("gradeId", 2); // map.put("name", "%李%"); // map.put("age", 11); List<Student> studentList=studentMapper.searchStudents4(map); for(Student student:studentList){ System.out.println(student); } } @Test public void testSearchStudents5() { logger.info("添加学生(带条件)"); Map<String,Object> map=new HashMap<String,Object>(); List<Integer> gradeIds=new ArrayList<Integer>(); // gradeIds.add(1); gradeIds.add(2); map.put("gradeIds", gradeIds); List<Student> studentList=studentMapper.searchStudents5(map); for(Student student:studentList){ System.out.println(student); } } @Test public void testUpdateStudent(){ logger.info("更新学生(带条件)"); Student student=new Student(); student.setId(1); student.setName("张三3"); student.setAge(13); studentMapper.updateStudent(student); sqlSession.commit(); } } // \src\com\java1234\service\StudentTest2.java package com.java1234.service; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.InputStream; import java.io.OutputStream; import java.util.HashMap; import java.util.List; import java.util.Map; import org.apache.ibatis.session.SqlSession; import org.apache.log4j.Logger; import org.junit.After; import org.junit.Before; import org.junit.Test; import com.java1234.mappers.StudentMapper; import com.java1234.model.Student; import com.java1234.util.SqlSessionFactoryUtil; public class StudentTest2 { private static Logger logger=Logger.getLogger(StudentTest2.class); private SqlSession sqlSession=null; private StudentMapper studentMapper=null; /** * 测试方法前调用 * @throws Exception */ @Before public void setUp() throws Exception { sqlSession=SqlSessionFactoryUtil.openSession(); studentMapper=sqlSession.getMapper(StudentMapper.class); } /** * 测试方法后调用 * @throws Exception */ @After public void tearDown() throws Exception { sqlSession.close(); } @Test public void testInsertStudent(){ logger.info("添加学生"); Student student=new Student(); student.setName("张三4"); student.setAge(14); student.setRemark("很长的本文..."); byte []pic=null; try{ File file=new File("c://boy.jpg"); InputStream inputStream=new FileInputStream(file); pic=new byte[inputStream.available()]; inputStream.read(pic); inputStream.close(); }catch(Exception e){ e.printStackTrace(); } student.setPic(pic); studentMapper.insertStudent(student); sqlSession.commit(); } @Test public void testGetStudentById(){ logger.info("通过ID查找学生"); Student student=studentMapper.getStudentById(4); System.out.println(student); byte []pic=student.getPic(); try{ File file=new File("d://boy2.jpg"); OutputStream outputStream=new FileOutputStream(file); outputStream.write(pic); outputStream.close(); }catch(Exception e){ e.printStackTrace(); } } @Test public void testSearchStudents6() { logger.info("添加学生(带条件)"); List<Student> studentList=studentMapper.searchStudents6("%3%",12); for(Student student:studentList){ System.out.println(student); } } } // \src\com\java1234\service\StudentTest3.java package com.java1234.service; import java.util.HashMap; import java.util.List; import java.util.Map; import org.apache.ibatis.session.RowBounds; import org.apache.ibatis.session.SqlSession; import org.apache.log4j.Logger; import org.junit.After; import org.junit.Before; import org.junit.Test; import com.java1234.mappers.StudentMapper; import com.java1234.model.Student; import com.java1234.util.SqlSessionFactoryUtil; public class StudentTest3 { private static Logger logger=Logger.getLogger(StudentTest3.class); private SqlSession sqlSession=null; private StudentMapper studentMapper=null; /** * 测试方法前调用 * @throws Exception */ @Before public void setUp() throws Exception { sqlSession=SqlSessionFactoryUtil.openSession(); studentMapper=sqlSession.getMapper(StudentMapper.class); } /** * 测试方法后调用 * @throws Exception */ @After public void tearDown() throws Exception { sqlSession.close(); } @Test public void testFindStudent(){ logger.info("查询学生"); int offset=0,limit=3; RowBounds rowBounds=new RowBounds(offset,limit); List<Student> studentList=studentMapper.findStudents(rowBounds); for(Student student:studentList){ System.out.println(student); } } @Test public void testFindStudent2(){ logger.info("查询学生"); Map<String,Object> map=new HashMap<String,Object>(); map.put("start", 3); map.put("size", 3); List<Student> studentList=studentMapper.findStudents2(map); for(Student student:studentList){ System.out.println(student); } } } // \src\com\java1234\util\SqlSessionFactoryUtil.java package com.java1234.util; import java.io.InputStream; import org.apache.ibatis.io.Resources; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.session.SqlSessionFactoryBuilder; public class SqlSessionFactoryUtil { private static SqlSessionFactory sqlSessionFactory; public static SqlSessionFactory getSqlSessionFactory(){ if(sqlSessionFactory==null){ InputStream inputStream=null; try{ inputStream=Resources.getResourceAsStream("mybatis-config.xml"); sqlSessionFactory=new SqlSessionFactoryBuilder().build(inputStream); }catch(Exception e){ e.printStackTrace(); } } return sqlSessionFactory; } public static SqlSession openSession(){ return getSqlSessionFactory().openSession(); } }
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