iBatis 简介：

 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 @Override40 public String toString() {41 return "id=" + id + "\tname=" + name + "\tmajor=" + birth + "\tscore="42 + score + "\n";43 }44 }

1 driver=com.mysql.jdbc.Driver2 url=jdbc:mysql://localhost:3306/ibatis3 username=root4 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 * from11 tbl_student12 </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 like22 ‘%$name$%‘23 </select>24 <insert id="addStudent" parameterClass="Student">25 insert into26 tbl_student(name,birth,score) values27 (#name#,#birth#,#score#);28 <selectKey resultClass="int" keyProperty="id">29 select @@identity as inserted30 <!-- 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 set45 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="http://www.mamicode.com/${driver}" />12 <property name="JDBC.ConnectionURL" value="http://www.mamicode.com/${url}" />13 <property name="JDBC.Username" value="http://www.mamicode.com/${username}" />14 <property name="JDBC.Password" value="http://www.mamicode.com/${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.com10 *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 }