一. 動態sql

1. if標簽

2. where標簽

3. foreach標簽

二. 動態sql例子

1. 新建一個名為DynamicSql的Java工程, 拷入相關jar包

2. 新建User.java

package com.lywgames.domain;import java.util.Date;public class User {private Integer id;private String name;private String sex;private Date birthday;private String address;public User() {}public User(String name, String sex, Date birthday, String address) {this.name = name;this.sex = sex;this.birthday = birthday;this.address = address;}public User(Integer id, String name, String sex, Date birthday, String address) {this.id = id;this.name = name;this.sex = sex;this.birthday = birthday;this.address = address;}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 getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}public Date getBirthday() {return birthday;}public void setBirthday(Date birthday) {this.birthday = birthday;}public String getAddress() {return address;}public void setAddress(String address) {this.address = address;}@Overridepublic String toString() {return "User [id=" + id + ", name=" + name + ", sex=" + sex + ", birthday=" + birthday + ", address=" + address+ "]";}}

3. 新建UserMapper.java接口

package com.lywgames.dao;import java.util.List; import com.lywgames.domain.User;public interface UserMapper {public List<User> selectUserByName(String name);public List<User> selectUserByIds(List<Integer> ids);public List<User> selectUser(User user); }

4. 在和UserMapper.java接口同一目錄下新建UserMapper.xml映射文件

5. 在src目錄下新建jdbc.properties數據庫屬性文件

6. 在src目錄下新建SqlMapConfig.xml數據庫配置文件

7. 新建Test.java

package com.lywgames;import java.io.InputStream; import java.util.Arrays; import java.util.List; import org.apache.ibatis.io.Resources; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.session.SqlSessionFactoryBuilder; import com.lywgames.dao.UserMapper; import com.lywgames.domain.User;public class Test {public static void main(String[] args) {SqlSession sqlSession = null;try {// 指定全局配置文件String resource = "SqlMapConfig.xml";// 讀取配置文件InputStream inputStream = Resources.getResourceAsStream(resource);// 構建sqlSessionFactorySqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);// 獲取sqlSessionsqlSession = sqlSessionFactory.openSession();UserMapper userDao = sqlSession.getMapper(UserMapper.class);// 查詢操作List<User> users = userDao.selectUserByName("李");for (User user : users) {System.out.println(user);}System.out.println("--------------------------------------");users = userDao.selectUser(new User(4, "李", "", null, ""));for (User user : users) {System.out.println(user);}System.out.println("--------------------------------------");users = userDao.selectUserByIds(Arrays.asList(4, 5));for (User user : users) {System.out.println(user);}} catch (Exception e) {e.printStackTrace();} finally {if(sqlSession != null) {// 釋放資源sqlSession.close();}}} }

8. 查看user表數據

9. 運行項目

總結

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