iBatis简单入门教程

 1 package com.iflytek.entity;
 2 import java.sql.Date;
 3 /**
 4 * @author xudongwang 2011-12-31
 5 *
 6 * Email:xdwangiflytek@gmail.com
 7 *
 8 */
 9 public class Student {
10 // 注意这里需要保证有一个无参构造方法，因为包括Hibernate在内的映射都是使用反射的，如果没有无参构造可能会出现问题
11 private int id;
12 private String name;
13 private Date birth;
14 private float score;
15 public int getId() {
16 return id;
17 }
18 public void setId(int id) {
19 this.id = id;
20 }
21 public String getName() {
22 return name;
23 }
24 public void setName(String name) {
25 this.name = name;
26 }
27 public Date getBirth() {
28 return birth;
29 }
30 public void setBirth(Date birth) {
31 this.birth = birth;
32 }
33 public float getScore() {
34 return score;
35 }
36 public void setScore(float score) {
37 this.score = score;
38 }
39 @Override
40 public String toString() {
41 return "id=" + id + "\tname=" + name + "\tmajor=" + birth + "\tscore="
42 + score + "\n";
43 }
44 }

1 driver=com.mysql.jdbc.Driver
2 url=jdbc:mysql://localhost:3306/ibatis
3 username=root
4 password=123

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE sqlMap PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN"
 3 "http://ibatis.apache.org/dtd/sql-map-2.dtd">
 4 <sqlMap>
 5 <!-- 通过typeAlias使得我们在下面使用Student实体类的时候不需要写包名 -->
 6 <typeAlias alias="Student" type="com.iflytek.entity.Student" />
 7 <!-- 这样以后改了sql，就不需要去改java代码了 -->
 8 <!-- id表示select里的sql语句，resultClass表示返回结果的类型 -->
 9 <select id="selectAllStudent" resultClass="Student">
10 select * from
11 tbl_student
12 </select>
13 <!-- parameterClass表示参数的内容 -->
14 <!-- #表示这是一个外部调用的需要传进的参数，可以理解为占位符 -->
15 <select id="selectStudentById" parameterClass="int" resultClass="Student">
16 select * from tbl_student where id=#id#
17 </select>
18 <!-- 注意这里的resultClass类型，使用Student类型取决于queryForList还是queryForObject -->
19 <select id="selectStudentByName" parameterClass="String"
20 resultClass="Student">
21 select name,birth,score from tbl_student where name like
22 ‘%$name$%‘
23 </select>
24 <insert id="addStudent" parameterClass="Student">
25 insert into
26 tbl_student(name,birth,score) values
27 (#name#,#birth#,#score#);
28 <selectKey resultClass="int" keyProperty="id">
29 select @@identity as inserted
30 <!-- 这里需要说明一下不同的数据库主键的生成，对各自的数据库有不同的方式： -->
31 <!-- mysql:SELECT LAST_INSERT_ID() AS VALUE -->
32 <!-- mssql:select @@IDENTITY as value -->
33 <!-- oracle:SELECT STOCKIDSEQUENCE.NEXTVAL AS VALUE FROM DUAL -->
34 <!-- 还有一点需要注意的是不同的数据库生产商生成主键的方式不一样，有些是预先生成 (pre-generate)主键的，如Oracle和PostgreSQL。
35 有些是事后生成(post-generate)主键的，如MySQL和SQL Server 所以如果是Oracle数据库，则需要将selectKey写在insert之前 -->
36 </selectKey>
37 </insert>
38 <delete id="deleteStudentById" parameterClass="int">
39 <!-- #id#里的id可以随意取，但是上面的insert则会有影响，因为上面的name会从Student里的属性里去查找 -->
40 <!-- 我们也可以这样理解，如果有#占位符，则ibatis会调用parameterClass里的属性去赋值 -->
41 delete from tbl_student where id=#id#
42 </delete>
43 <update id="updateStudent" parameterClass="Student">
44 update tbl_student set
45 name=#name#,birth=#birth#,score=#score# where id=#id#
46 </update>
47 </sqlMap>

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE sqlMapConfig PUBLIC "-//ibatis.apache.org//DTD SQL Map Config 2.0//EN"
 3 "http://ibatis.apache.org/dtd/sql-map-config-2.dtd">
 4 <sqlMapConfig>
 5 <!-- 引用JDBC属性的配置文件 -->
 6 <properties resource="com/iflytek/entity/SqlMap.properties" />
 7 <!-- 使用JDBC的事务管理 -->
 8 <transactionManager type="JDBC">
 9 <!-- 数据源 -->
10 <dataSource type="SIMPLE">
11 <property name="JDBC.Driver" value="${driver}" />
12 <property name="JDBC.ConnectionURL" value="${url}" />
13 <property name="JDBC.Username" value="${username}" />
14 <property name="JDBC.Password" value="${password}" />
15 </dataSource>
16 </transactionManager>
17 <!-- 这里可以写多个实体的映射文件 -->
18 <sqlMap resource="com/iflytek/entity/Student.xml" />
19 </sqlMapConfig>

package com.iflytek.dao;
import java.util.List;
import com.iflytek.entity.Student;
/**
* @author xudongwang 2011-12-31
*
* Email:xdwangiflytek@gmail.com
*
*/
public interface StudentDao {
/**
* 添加学生信息
*
* @param student
* 学生实体
* @return 返回是否添加成功
*/
public boolean addStudent(Student student);
/**
* 根据学生id删除学生信息
*
* @param id
* 学生id
* @return 删除是否成功
*/
public boolean deleteStudentById(int id);
/**
* 更新学生信息
*
* @param student
* 学生实体
* @return 更新是否成功
*/
public boolean updateStudent(Student student);
/**
* 查询全部学生信息
*
* @return 返回学生列表
*/
public List<Student> selectAllStudent();
/**
* 根据学生姓名模糊查询学生信息
*
* @param name
* 学生姓名
* @return 学生信息列表
*/
public List<Student> selectStudentByName(String name);
/**
* 根据学生id查询学生信息
*
* @param id
* 学生id
* @return 学生对象
*/
public Student selectStudentById(int id);
}

  1 package com.iflytek.daoimpl;
  2 import java.io.IOException;
  3 import java.io.Reader;
  4 import java.sql.SQLException;
  5 import java.util.List;
  6 import com.ibatis.common.resources.Resources;
  7 import com.ibatis.sqlmap.client.SqlMapClient;
  8 import com.ibatis.sqlmap.client.SqlMapClientBuilder;
  9 import com.iflytek.dao.StudentDao;
 10 import com.iflytek.entity.Student;
 11 /**
 12 * @author xudongwang 2011-12-31
 13 *
 14 * Email:xdwangiflytek@gmail.com
 15 *
 16 */
 17 public class StudentDaoImpl implements StudentDao {
 18 private static SqlMapClient sqlMapClient = null;
 19 // 读取配置文件
 20 static {
 21 try {
 22 Reader reader = Resources
 23 .getResourceAsReader("com/iflytek/entity/SqlMapConfig.xml");
 24 sqlMapClient = SqlMapClientBuilder.buildSqlMapClient(reader);
 25 reader.close();
 26 } catch (IOException e) {
 27 e.printStackTrace();
 28 }
 29 }
 30 public boolean addStudent(Student student) {
 31 Object object = null;
 32 boolean flag = false;
 33 try {
 34 object = sqlMapClient.insert("addStudent", student);
 35 System.out.println("添加学生信息的返回值：" + object);
 36 } catch (SQLException e) {
 37 e.printStackTrace();
 38 }
 39 if (object != null) {
 40 flag = true;
 41 }
 42 return flag;
 43 }
 44 public boolean deleteStudentById(int id) {
 45 boolean flag = false;
 46 Object object = null;
 47 try {
 48 object = sqlMapClient.delete("deleteStudentById", id);
 49 System.out.println("删除学生信息的返回值：" + object + "，这里返回的是影响的行数");
 50 } catch (SQLException e) {
 51 e.printStackTrace();
 52 }
 53 if (object != null) {
 54 flag = true;
 55 }
 56 return flag;
 57 }
 58 public boolean updateStudent(Student student) {
 59 boolean flag = false;
 60 Object object = false;
 61 try {
 62 object = sqlMapClient.update("updateStudent", student);
 63 System.out.println("更新学生信息的返回值：" + object + "，返回影响的行数");
 64 } catch (SQLException e) {
 65 e.printStackTrace();
 66 }
 67 if (object != null) {
 68 flag = true;
 69 }
 70 return flag;
 71 }
 72 public List<Student> selectAllStudent() {
 73 List<Student> students = null;
 74 try {
 75 students = sqlMapClient.queryForList("selectAllStudent");
 76 } catch (SQLException e) {
 77 e.printStackTrace();
 78 }
 79 return students;
 80 }
 81 public List<Student> selectStudentByName(String name) {
 82 List<Student> students = null;
 83 try {
 84 students = sqlMapClient.queryForList("selectStudentByName",name);
 85 } catch (SQLException e) {
 86 e.printStackTrace();
 87 }
 88 return students;
 89 }
 90 public Student selectStudentById(int id) {
 91 Student student = null;
 92 try {
 93 student = (Student) sqlMapClient.queryForObject(
 94 "selectStudentById", id);
 95 } catch (SQLException e) {
 96 e.printStackTrace();
 97 }
 98 return student;
 99 }
100 }

 1 package com.iflytek.test;
 2 import java.sql.Date;
 3 import java.util.List;
 4 import com.iflytek.daoimpl.StudentDaoImpl;
 5 import com.iflytek.entity.Student;
 6 /**
 7 * @author xudongwang 2011-12-31
 8 *
 9 * Email:xdwangiflytek@gmail.com
10 *
11 */
12 public class TestIbatis {
13 public static void main(String[] args) {
14 StudentDaoImpl studentDaoImpl = new StudentDaoImpl();
15 System.out.println("测试插入");
16 Student addStudent = new Student();
17 addStudent.setName("李四");
18 addStudent.setBirth(Date.valueOf("2011-09-02"));
19 addStudent.setScore(88);
20 System.out.println(studentDaoImpl.addStudent(addStudent));
21 System.out.println("测试根据id查询");
22 System.out.println(studentDaoImpl.selectStudentById(1));
23 System.out.println("测试模糊查询");
24 List<Student> mohuLists = studentDaoImpl.selectStudentByName("李");
25 for (Student student : mohuLists) {
26 System.out.println(student);
27 }
28 System.out.println("测试查询所有");
29 List<Student> students = studentDaoImpl.selectAllStudent();
30 for (Student student : students) {
31 System.out.println(student);
32 }
33 System.out.println("根据id删除学生信息");
34 System.out.println(studentDaoImpl.deleteStudentById(1));
35 System.out.println("测试更新学生信息");
36 Student updateStudent = new Student();
37 updateStudent.setId(1);
38 updateStudent.setName("李四1");
39 updateStudent.setBirth(Date.valueOf("2011-08-07"));
40 updateStudent.setScore(21);
41 System.out.println(studentDaoImpl.updateStudent(updateStudent));
42 }
43 }