Mybatis(动态SQL大全)

配置bean Employee.java

package org.apwla.domain;

import java.io.Serializable;

public class Employee implements Serializable {
	private Integer id;
	private String loginname;
	private String password;
	private String name;
	private String sex;
	private String age;
	private String phone;
	private String sal;
	private String state;

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getLoginname() {
		return loginname;
	}

	public void setLoginname(String loginname) {
		this.loginname = loginname;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}

	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 String getAge() {
		return age;
	}

	public void setAge(String age) {
		this.age = age;
	}

	public String getPhone() {
		return phone;
	}

	public void setPhone(String phone) {
		this.phone = phone;
	}

	public String getSal() {
		return sal;
	}

	public void setSal(String sal) {
		this.sal = sal;
	}

	public String getState() {
		return state;
	}

	public void setState(String state) {
		this.state = state;
	}
	@Override
	public String toString() {
		return "Employee [id=" + id + ", loginname=" + loginname
				+ ", password=" + password + ", name=" + name + ", sex=" + sex
				+ ", age=" + age + ", phone=" + phone + ", sal=" + sal
				+ ", state=" + state + "]";
	}
}

配置接口EmployeeMapper.java

package org.apwla.mapper;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apwla.domain.Employee;

public interface EmployeeMapper {
	
	List<Employee> selectEmployeeByIdLike(HashMap<String, Object> params);
	
	List<Employee> selectEmployeeByLoginLike(HashMap<String, Object> params);
	
	List<Employee> selectEmployeeChoose(HashMap<String, Object> params);
	
	List<Employee> findEmployeeLike(HashMap<String, Object> params);
	
	List<Employee> selectEmployeeLike(HashMap<String, Object> params);
	
	Employee selectEmployeeWithId(Integer id);
	
	void updateEmployeeIfNecessary(Employee employee);
	
	List<Employee> selectEmployeeIn(List<Integer> ids);
	
	List<Employee> selectEmployeeLikeName(Employee employee);
	
}

配置mybatis-config.xml 接口的实现类

<?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">
<!-- namespace指用户自定义的命名空间。 -->
<mapper namespace="org.apwla.mapper.EmployeeMapper">

	<select id="selectEmployeeWithId" parameterType="int"
		resultType="org.apwla.domain.Employee">
		SELECT * FROM tb_employee where id = #{id}
	</select>

	<!-- if -->
	<select id="selectEmployeeByIdLike" resultType="org.apwla.domain.Employee" parameterType="java.util.HashMap">
		SELECT * FROM tb_employee WHERE state = 'ACTIVE'
		<!-- 可选条件，如果传进来的参数有id属性，则加上id查询条件 -->
		<if test="id != null ">
			and id = #{id}
		</if>
	</select>

	<!-- if -->
	<select id="selectEmployeeByLoginLike" resultType="org.apwla.domain.Employee">
		SELECT * FROM tb_employee WHERE state = 'ACTIVE'
		<!-- 两个可选条件，例如登录功能的登录名和密码查询 -->
		<if test="loginname != null and password != null">
			and loginname = #{loginname} and password = #{password}
		</if>
	</select>

	<!-- choose（when、otherwise） -->
	<select id="selectEmployeeChoose" parameterType="hashmap"
		resultType="org.apwla.domain.Employee">
		SELECT * FROM tb_employee WHERE state = 'ACTIVE'
		<!-- 如果传入了id，就根据id查询，没有传入id就根据loginname和password查询，否则查询sex等于男的数据 -->
		<choose>
			<when test="id != null">
				and id = #{id}
			</when>
			<when test="loginname != null and password != null">
				and loginname = #{loginname} and password = #{password}
			</when>
			<otherwise>
				and sex = '男'
			</otherwise>
		</choose>
	</select>

	<select id="findEmployeeLike" resultType="org.apwla.domain.Employee">
		SELECT * FROM tb_employee
		<where>
			<if test="state != null ">
				state = #{state}
			</if>
			<if test="id != null ">
				and id = #{id}
			</if>
			<if test="loginname != null and password != null">
				and loginname = #{loginname} and password = #{password}
			</if>
		</where>
	</select>

	<!-- where -->
	<select id="selectEmployeeLike" resultType="org.apwla.domain.Employee">
		SELECT * FROM tb_employee
		<where>
			<if test="state != null ">
				state = #{state}
			</if>
			<if test="id != null ">
				and id = #{id}
			</if>
			<if test="loginname != null and password != null">
				and loginname = #{loginname} and password = #{password}
			</if>
		</where>
	</select>

	<!-- set -->
	<update id="updateEmployeeIfNecessary" parameterType="org.apwla.domain.Employee">
		update tb_employee
		<set>
			<if test="loginname != null">loginname=#{loginname},</if>
			<if test="password != null">password=#{password},</if>
			<if test="name != null">name=#{name},</if>
			<if test="sex != null">sex=#{sex},</if>
			<if test="age != null">age=#{age},</if>
			<if test="phone != null">phone=#{phone},</if>
			<if test="sal != null">sal=#{sal},</if>
			<if test="state != null">state=#{state}</if>
		</set>
		where id=#{id}
	</update>

	<!-- foreach -->
	<select id="selectEmployeeIn" resultType="org.apwla.domain.Employee">
		SELECT *
		FROM tb_employee
		WHERE ID in
		<foreach item="item" index="index" collection="list" open="("
			separator="," close=")">
			#{item}
		</foreach>
	</select>
	
	

	<!-- bind -->
	<select id="selectEmployeeLikeName" resultType="org.apwla.domain.Employee">
		<bind name="pattern" value="'%' + _parameter.getName() + '%'" />
		SELECT * FROM tb_employee
		WHERE loginname LIKE #{pattern}
	</select>

</mapper>

核心配置文件 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">
<!-- XML配置文件包含对MyBatis系统的核心配置 -->
<configuration>
<!-- 加载属性文件 -->
	<properties resource="db.properties">
		<!--properties中还可以配置一些属性名和属性值  -->
		<!-- <property name="jdbc.driver" value=""/> -->
	</properties>
	<settings>
		<setting name="logImpl" value="LOG4J" />
		<setting name="lazyLoadingEnabled" value="true" />
		<setting name="aggressiveLazyLoading" value="false" />
	</settings>
<!-- 和spring整合后 environments配置将废除-->
	<environments default="development">
		<environment id="development">
		<!-- 使用jdbc事务管理，事务控制由mybatis-->
			<transactionManager type="JDBC" />
		<!-- 数据库连接池，由mybatis管理-->
			<dataSource type="POOLED">
				<property name="driver" value="${jdbc.driver}" />
				<property name="url" value="${jdbc.url}" />
				<property name="username" value="${jdbc.username}" />
				<property name="password" value="${jdbc.password}" />
			</dataSource>
		</environment>
	</environments>

	<!-- mappers告诉MyBatis去哪里找持久化类的映射文件 -->
	<mappers>
		<mapper resource="org/apwla/mapper/PersonMapper.xml"></mapper>
		<mapper resource="org/apwla/mapper/CardMapper.xml"></mapper>
		<mapper resource="org/apwla/mapper/EmployeeMapper.xml" />
	</mappers>
</configuration>