如何使用 mybatis 在 java 中映射 mysql 点类型

How to map mysql point type in java using mybatis

如何使用mybatis映射mysql点类型到java?现在是 java.lang.Object。 这是我的 table:

CREATE TABLE `test` (
  `id` int(11) NOT NULL,
  `location` point DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1

这是生成器给出的xml:

  <resultMap id="BaseResultMap" type="package.model.Test">
    <id column="id" jdbcType="INTEGER" property="id" />
    <result column="location" jdbcType="OTHER" property="location" />
  </resultMap>
  <insert id="insert" parameterType="package.model.Test">
    insert into test (id, location)
    values (#{id,jdbcType=INTEGER}, #{location,jdbcType=OTHER})
  </insert>

我试过:

public void testPointType() {
    GeometryFactory geometryFactory = new GeometryFactory();
    com.vividsolutions.jts.geom.Point point = geometryFactory.createPoint(new Coordinate(1, 1));
    package.model.Test record = new package.model.Test();
    record.setLocation(point.toText());
    testMapper.insertSelective(record);
}

但得到:com.mysql.jdbc.MysqlDataTruncation: Data truncation: Cannot get geometry object from data you send to the GEOMETRY field

不确定模型 Test 中有哪些字段,也不确定它是否适合您,但请尝试一下;)

<insert id="insert" parameterType="package.model.Test">
    insert into test (id, location)
    values (#{id,jdbcType=INTEGER}, Point( #{location.x}, #{location.x} ))
</insert>

而且我认为你最好将模型定义为 Test,例如:

public class Test {
    private String id;
    private String locationX;
    private String locationY;

    ... ...
    getter and setter
    ... ...

}

然后你可以这样做:

<insert id="insert" parameterType="package.model.Test">
    insert into test (id, location)
    values (#{id,jdbcType=INTEGER}, Point( #{locationX}, #{locationY} ))
</insert>

对于这种模型Test,你可以select像:

<select id="insert" resultType="package.model.Test">
    select id, x(location) as locationX, y(location) as locationY from test
</select>

经过几个小时的挖掘。我一直在寻找这种方式:

<insert id="insert" parameterType="package.model.Test">
    insert into test (id, location)
    values (#{id,jdbcType=INTEGER}, GeomFromText(#{location,jdbcType=OTHER}))
</insert>

并且在 java 中,模型可以将点类型设为对象,并分配一个字符串 "point(1 1)" 或使用 vividsolutions geometryObject.toText() 方法。

一开始不行是因为没有GeomFromText(),mybatis认为是insert int test (id, location) values (1, 'point(1 1)'),这个值有引号。 到 select:

<select resultType="java.lang.String">
    select astext(location) from test
</select>