[英]Mybatis mapper to Mysql Point object
我正在基于空间功能的Spring引导服务器上工作。
我被mybatis匹配到定制对象所困扰。
现在,我已经创建了表和一列startLocation,这是Point类型。
CREATE TABLE `vehicle`.`route` (
`createtime` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP,
`updatetime` TIMESTAMP NULL,
`startLocation` POINT NULL,
`id` INT(11) NOT NULL AUTO_INCREMENT,
PRIMARY KEY (`id`));
我的Route java对象是
@Table(name = "route")
public class Route extends Base {
Point startLocation;
public Location getStartLocation() {
return startLocation;
}
public void setStartLocation(Location startLocation) {
this.startLocation = startLocation;
}
....other fields
}
而且我的Location对象只保存lat和long的double值。
package com.supplyplatform.pojo;
public class Location {
double Lat;
double Long;
public double getLat() {
return Lat;
}
public void setLat(double lat) {
Lat = lat;
}
public double getLong() {
return Long;
}
public void setLong(double l) {
Long = l;
}
}
我的RouteMapper.xml是
<?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">
<mapper namespace="com.supplyplatform.mapper.RouteMapper">
<resultMap type = "com.supplyplatform.pojo.Route" id="Route">
<id column="id" jdbcType="INTEGER" property="id" />
<result column="startpoint" jdbcType="OTHER" property="startLocation" />
</resultMap>
</mapper>
并且它不返回任何类型处理程序异常。 我没有花几天时间No typehandler found for property startLocation
处理程序。 先感谢您。
更新:我正在尝试在嵌套结果图之间创建关联。 新的xml文件为:
<?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">
<mapper namespace="com.supplyplatform.mapper.RouteMapper">
<select id="selectRoute" resultMap="Route">
SELECT *, X(startpoint) as x, Y(startpoint) as y FROM vehicle.vc_route
</select>
<resultMap type = "com.supplyplatform.pojo.Route" id="Route">
<id column="id" jdbcType="INTEGER" property="id" />
<association property="startLocation" resultMap="Location" />
</resultMap>
<resultMap type = "com.supplyplatform.pojo.Location" id="Location">
<result column="y" property="lat" />
<result column="x" property="long" />
</resultMap>
</mapper>
但是它始终不为Location startLocation
返回任何类型处理程序异常。
位置是一种复杂的类型,因此您必须指定如何映射。
您可以将其分解为2个简单类型值: SELECT ST_X(startPoint) as x, ST_Y(startpoint) as y
,然后映射一个关联:请注意,如本文和Mysql doc中所指定,您应使用st_x / st_y因为x / y已从Mysql 5.7.6中弃用。
<?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">
<mapper namespace="com.supplyplatform.mapper.RouteMapper">
<resultMap type = "com.supplyplatform.pojo.Route" id="Route">
<id column="id" jdbcType="INTEGER" property="id" />
<association property="startLocation" resultMap="Location" />
</resultMap>
<resultMap type = "com.supplyplatform.pojo.Location" id="Location">
<result column="y" property="lat" />
<result column="x" property="long" />
</resultMap>
</mapper>
或者,您可以定义类型处理程序:
public class PointTypeHandler extends org.apache.ibatis.type.BaseTypeHandler<Location> {
Location getNullableResult(ResultSet rs, String columnName) {
Location location = new Location();
Object point = rs.getObject(columnName);
/* whatever is required to fill Location object */
return location
}
}
这是JDBC代码, 本文可能会提供一些线索 。
并在映射中引用它: <result column="startpoint" jdbcType="OTHER" property="startLocation" typeHandler="PointTypeHandler"/>
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.