利用MyBatis实现条件查询的方法汇总

<!-- cache配置 -->
<cache 
	eviction="FIFO"
 	flushInterval="60000"
 size="512" 
 	readOnly="true" />

	<select id="selectTest" resultType="int" useCache="true">
  select id from text where id = 1
 </select>

<select id="selectTest" resultType="User" parameterType="string">
  select * from text where name = #{name}
 </select>

String sql = "select * from text where name = ? ";
PreparedStatement ps = new PreparedStatement(sql);
ps.setString(1,name);

<!-- 设置resultMap的映射 -->
<resultMap id="TestMap" type="text">
	<id property="id" column="id" />
	<reuslt property="name" column="name" />
	<!-- 比如text类中有个 List<User> 的属性
	则需要使用该该标签绑定User表 
	如果只是 User类型的参数的话使用 association 标签 
	他们两个标签的属性差不多只，是association是javaType来指定类型
	而collection使用的是ofType来指定类型，
	多表查询时最好给每个id设置别名，以免插入到其他的id
	-->
	<collection property="userList" ofType="User">
		<id property="id" column="u_id" />
		<result property="UserName" column="UserName" />
		<result property="password" column="password" />
	</collection>
</reusltMap>
<!-- 设置多表查询 -->
<select id="textList" resultMap="TestMap" parameterType="Integer">
	select t.*,u.id = u_id,u.UserName,u.password 
	from text as t,User as u where t.id = u.id and t.id = #{id}
</select>

<resultMap type = "实体类或基本数据,他们的别名" id = "userList">
	<result property="id" column="对应数据库的id" />
	<result property="name" column="对应数据库的name" />
	<result property="password" column="对应数据库的password" />
	<result property="age" column="对应数据库的age" />
</resultMap> 

Sqlsession = factory.opSession(false);//true 为自动提交事务

Sqlsession.commit();//提交事务

Sqlsession.rollback();//回滚事务

<!-- 增加用户 -->
<insert parameterType="User">
	insert user into(userName,password)
	values(#{userName},#{password})
</insert>

<!-- 修改用户 -->
<update parameterType="User">
	update user set userName = #{userName} ,password =#{password}
	where id = #{id}
</update >

/**
*我们需要接口方法的参数里面添加@Param注解
**/
 int update(@Param("id") int id,@Param("name") String name);

<update >
	update user set userName = #{name}
	where id = #{id}
</update >

	int deleteUser(@Param("id") Integer id);

<delete parameterType="Integer">
	delete from user where id = #{id}
</delete>

class User{
	private int id;
	private String name;
	private String password;
	private text userText;
	//省略getter和setter方法
}

<resultMap type = "User" >
	<result property="id" column="id" />
	<result property="name" column="name" />
	<result property="password" column="password" />
	<association property="userText" javaType="Text">
		<id property="id" cloumn="t_id"/>
		<result property="tname" column="tname" />
		<result property="text" column="text" />
	</association>
</resultMap> 

<resultMap type = "User" >
	<result property="id" column="id" />
	<result property="name" column="name" />
	<result property="password" column="password" />
	<association property="userText" javaType="Text" resultMap="TextEntity" />
</resultMap> 
<resultMap type = "Text" >
		<id property="id" cloumn="t_id"/>
		<result property="tname" column="tname" />
		<result property="text" column="text" />
</resultMap> 

class User{
	private int id;
	private String name;
	private String password;
	private List<text> userText;
	//省略getter和setter方法
}

	public List<User> getUserIDListBy(@Param("id") Integer userid);

<resultMap type = "User" >
	<result property="id" column="id" />
	<result property="name" column="name" />
	<result property="password" column="password" />
	<collection property="userText" ofType="Text">
		<id property="id" cloumn="t_id"/>
		<result property="tname" column="tname" />
		<result property="text" column="text" />
	</collection>
</resultMap> 

<resultMap type = "User" >
	<result property="id" column="id" />
	<result property="name" column="name" />
	<result property="password" column="password" />
	<collection property="userText" ofType="Text" resultMap="textList" />
</resultMap> 
<resultMap type = "Text" >
		<id property="id" cloumn="t_id"/>
		<result property="tname" column="tname" />
		<result property="text" column="text" />
</resultMap> 

<settings>
<!-- 设置resultMap的自动映射级别为FULL（自动匹配所有） -->
	<setting name="autoMappingBehavior" value="FULL"/>
</settings>