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ibatis入门教程一
这几天研究ibatis玩，参考一篇贴子进行安装配置：蓝雪森林
选择这个帖子来跟随配置是因为这个帖子看着比较干净，但是我仍旧在配置得过程中出现了好几个问题，所以我决定在这个帖子的基础上将更多细节加上，做一个傻瓜教程。
一、前期准备
虽然ibatis能处理多种数据库，不过初学者还是比较适应mysql，因此我选择mysql作为我的数据载体。另外我准备建的是一个普通的java 工程，并采用maven命令行来建立这个工程。所以在这之前，电脑上需要安装maven和mysql。
二、工程建立
①使用maven建立java工程框架
②编辑pom.xml文件引入ibatis和mysql的依赖包
1: <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
2: xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
3: <modelVersion>4.0.0</modelVersion>
4: 5: <groupId>com.lipan.ibatis</groupId>
6: <artifactId>TestIbatis</artifactId>
7: <version>1.0-SNAPSHOT</version>
8: <packaging>jar</packaging>
9: 10: <name>TestIbatis</name>
11: <url>http://maven.apache.org</url>
12: 13: <properties>
14: <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
15: </properties>
16: 17: <dependencies>
18: <dependency>
19: <groupId>junit</groupId>
20: <artifactId>junit</artifactId>
21: <version>3.8.1</version>
22: <scope>test</scope>
23: </dependency>
24: <dependency>
25: <groupId>org.apache.ibatis</groupId>
26: <artifactId>ibatis-sqlmap</artifactId>
27: <version>2.3.4.726</version>
28: </dependency>
29: <dependency>
30: <groupId>mysql</groupId>
31: <artifactId>mysql-connector-java</artifactId>
32: <version>5.0.5</version>
33: </dependency>
34: 35: </dependencies>
36: </project>
③下载依赖包并将maven工程转换为eclipse工程
④建立好的工程目录如下：
其中resource是后面新建的。
三、创建数据库表
可以选择命令行创建，也可以选择用可视化工具（比如Navicat Mysql来创建），我选择的是用Navicat来创建，最终创建的表的样子如下图所示。
其中，本地数据库localhost:3036中我建立了一个tbl_student的表，该表的主键是id，且有自增属性
四、填写ibatis配置文件
这里有三个配置文件：
SqlMap.properties 、SqlMapConfig.xml和Student.xml
ibatis要求首先描述数据库连接信息，这个可以在SqlMap.properties文件里面填写，同时SqlMapConfig.xml文件会读取SqlMap.properties中的信息来初始化数据库，针对每个数据库表，可以用一个专门的xml文件来描述具体的查询操作实现，这里我们建立的针对于tbl_student的xml文件称为Student.xml，接下来会给出其内容。为了组织清晰，在src目录下建立resources目录，用来存放这三个配置文件。
五、具体实现文件
这里有三个文件：
Student.java：与数据库实体对应的POJO类
1: package com.lipan.ibatis;
2: 3: import java.sql.Date;
4: /**
5: * @author:lipan
6: * Email: areslipan@163.com
7: *
8: */
9: public class Student {
10: 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: }StudentDao.java：定义访问数据库的接口
1: package com.lipan.dao;
2: 3: 4: 5: 6: import java.util.List;
7: import com.lipan.ibatis.Student;
8: /**
9: * @author xudongwang 2011-12-31
10: *
11: * Email:xdwangiflytek@gmail.com
12: *
13: */
14: public interface StudentDao {
15: /**
16: * 添加学生信息
17: *
18: * @param student
19: * 学生实体
20: * @return 返回是否添加成功
21: */
22: public boolean addStudent(Student student);
23: 24: /**
25: * 根据学生id删除学生信息
26: *
27: * @param id
28: * 学生id
29: * @return 删除是否成功
30: */
31: public boolean deleteStudentById(int id);
32: 33: /**
34: * 更新学生信息
35: *
36: * @param student
37: * 学生实体
38: * @return 更新是否成功
39: */
40: public boolean updateStudent(Student student);
41: 42: /**
43: * 查询全部学生信息
44: *
45: * @return 返回学生列表
46: */
47: public List<Student> selectAllStudent();
48: 49: /**
50: * 根据学生姓名模糊查询学生信息
51: *
52: * @param name
53: * 学生姓名
54: * @return 学生信息列表
55: */
56: public List<Student> selectStudentByName(String name);
57: 58: /**
59: * 根据学生id查询学生信息
60: *
61: * @param id
62: * 学生id
63: * @return 学生对象
64: */
65: public Student selectStudentById(int id);
66: }StudentDaoImpl.java：访问数据库的具体实现，需要读取SqlMapConfig.xml的配置文件
1: package com.lipan.daoImpl;
2: 3: import java.io.IOException;
4: import java.io.Reader;
5: import java.sql.SQLException;
6: import java.util.List;
7: import com.ibatis.common.resources.Resources;
8: import com.ibatis.sqlmap.client.SqlMapClient;
9: import com.ibatis.sqlmap.client.SqlMapClientBuilder;
10: import com.lipan.dao.StudentDao;
11: import com.lipan.ibatis.Student;
12: /**
13: * @author lipan
14: *
15: * Email:areslipan@163.com
16: *
17: */
18: public class StudentDaoImpl implements StudentDao {
19: private static SqlMapClient sqlMapClient = null;
20: // 读取配置文件
21: static {
22: try {
23: Reader reader = Resources 24: .getResourceAsReader("SqlMapConfig.xml");
25: 26: //.getResourceAsReader("SqlMapConfig.xml");
27: sqlMapClient = SqlMapClientBuilder.buildSqlMapClient(reader); 28: reader.close(); 29: } catch (IOException e) {
30: e.printStackTrace(); 31: } 32: } 33: 34: public boolean addStudent(Student student) {
35: Object object = null; 36: boolean flag = false;
37: try {
38: object = sqlMapClient.insert("addStudent", student);
39: System.out.println("添加学生信息的返回值：" + object);
40: } catch (SQLException e) {
41: e.printStackTrace(); 42: } 43: if (object != null) {
44: flag = true; 45: } 46: return flag;
47: } 48: 49: public boolean deleteStudentById(int id) {
50: boolean flag = false;
51: Object object = null; 52: try {
53: object = sqlMapClient.delete("deleteStudentById", id);
54: 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");
55: } catch (SQLException e) {
56: e.printStackTrace(); 57: } 58: if (object != null) {
59: flag = true; 60: } 61: return flag;
62: } 63: 64: public boolean updateStudent(Student student) {
65: boolean flag = false;
66: Object object = false; 67: try {
68: object = sqlMapClient.update("updateStudent", student);
69: System.out.println("更新学生信息的返回值：" + object + "，返回影响的行数");
70: } catch (SQLException e) {
71: e.printStackTrace(); 72: } 73: if (object != null) {
74: flag = true; 75: } 76: return flag;
77: } 78: 79: public List<Student> selectAllStudent() {
80: List<Student> students = null; 81: try {
82: students = sqlMapClient.queryForList("selectAllStudent");
83: } catch (SQLException e) {
84: e.printStackTrace(); 85: } 86: return students;
87: } 88: 89: public List<Student> selectStudentByName(String name) {
90: List<Student> students = null; 91: try {
92: students = sqlMapClient.queryForList("selectStudentByName", name);
93: } catch (SQLException e) {
94: e.printStackTrace(); 95: } 96: return students;
97: } 98: 99: public Student selectStudentById(int id) {
100: Student student = null; 101: try {
102: student = (Student) sqlMapClient.queryForObject( 103: "selectStudentById", id);
104: } catch (SQLException e) {
105: e.printStackTrace(); 106: } 107: return student;
108: } 109: }
六、测试文件
TestIbatis.java
1: package com.lipan.ibatis;
2: 3: import java.sql.Date;
4: import java.util.List;
5: 6: import com.lipan.daoImpl.StudentDaoImpl;
7: /**
8: * @author xudongwang 2011-12-31
9: *
10: * Email:xdwangiflytek@gmail.com
11: *
12: */
13: public class TestIbatis {
14: public static void main(String[] args) {
15: StudentDaoImpl studentDaoImpl = new StudentDaoImpl();
16: System.out.println("测试插入");
17: Student addStudent = new Student();
18: addStudent.setName("李四");
19: addStudent.setBirth(Date.valueOf("2011-09-02"));
20: addStudent.setScore(88); 21: //addStudent.setId(12);
22: System.out.println(studentDaoImpl.addStudent(addStudent)); 23: System.out.println("测试根据id查询");
24: System.out.println(studentDaoImpl.selectStudentById(1)); 25: System.out.println("测试模糊查询");
26: List<Student> mohuLists = studentDaoImpl.selectStudentByName("李");
27: for (Student student : mohuLists) {
28: System.out.println(student); 29: } 30: System.out.println("测试查询所有");
31: List<Student> students = studentDaoImpl.selectAllStudent(); 32: for (Student student : students) {
33: System.out.println(student); 34: } 35: System.out.println("根据id删除学生信息");
36: System.out.println(studentDaoImpl.deleteStudentById(1)); 37: System.out.println("测试更新学生信息");
38: Student updateStudent = new Student();
39: updateStudent.setId(1); 40: updateStudent.setName("李四1");
41: updateStudent.setBirth(Date.valueOf("2011-08-07"));
42: updateStudent.setScore(21); 43: System.out.println(studentDaoImpl.updateStudent(updateStudent)); 44: 45: } 46: }七、项目目录
八、注意
在读取SqlMapConfig.xml的时候，
Reader reader = Resources.getResourceAsReader("SqlMapConfig.xml");会提示 Could not find resource SqlMapConfig.xml，即便将这个路径编程绝对路径也会出错，原因是这个方法最终会调用Classloader.getResource()方法，个函数调用的是相对于classpath的绝对路径，所以load不进去。关于这个问题的详细理解，可以不断在代码中trace，也有个帖子专门讲这个问题。
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