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如何使用mybatis在Java中映射mysql点类型

[英]How to map mysql point type in java using mybatis

如何使用mybatis在Java中映射mysql点类型? 现在是java.lang.Object。 这是我的桌子:

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

这是生成器提供的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>

我努力了:

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);
}

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

经过数小时的挖掘。 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>

在Java中,模型的点类型可以为Object,并分配有字符串“ point(1 1)”或使用生动的解决方案geometryObject.toText()方法。

最初没有用是因为,如果没有GeomFromText()GeomFromText()其视为insert int test (id, location) values (1, 'point(1 1)') ,该值周围有一个引号。 选择:

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

不确定模型Test哪些字段,也不确定它是否对您有用,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>

而且我认为您最好像下面这样定义Test模型:

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

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

}

然后您可以这样做:

<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 ,您可以select如下:

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

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