Postgresql使用數組及Mybatis自定義Postgresql素組類型映射

創建

CREATE TABLE faviroute_book (
id serial primary key,
student_names TEXT[]
)

在普通類型後面加 [] 即可

插入

-- 方式一 使用{}
insert into student(student_names) values ('{阿離,小奏}')
-- 方式二  使用 array
insert into student(student_names) VALUES (array['韓信','關羽','張飛'])

查詢

select * from student
select student_names[2] from student

刪除

delete from student where student_names[3] = '張飛'
delete from  student where id = 3

更新

update student set student_names[1] = '阿離' where  id = 1

update student  set student_names[3] = '李白' where  id = 1

Mybatis中的使用

第一種更新操作比較容易， 自己拼接下標

 update student
        set student_names[#{index}] = #{name}
        where
        id= #{id}

第二種自定義數組類型

創建 ArrayTypeHandler

@MappedJdbcTypes(JdbcType.ARRAY)
@MappedTypes(String[].class)
public class ArrayTypeHandler extends BaseTypeHandler<Object[]> {
    private static final String TYPE_NAME_VARCHAR = "varchar";
    private static final String TYPE_NAME_INTEGER = "integer";
    private static final String TYPE_NAME_BOOLEAN = "boolean";
    private static final String TYPE_NAME_NUMERIC = "numeric";

    @Override
    public void setNonNullParameter(PreparedStatement ps, int i, Object[] parameter, JdbcType jdbcType) throws SQLException {
        String typeName = null;
        if (parameter instanceof Integer[]) {
            typeName = TYPE_NAME_INTEGER;
        } else if (parameter instanceof String[]) {
            typeName = TYPE_NAME_VARCHAR;
        } else if (parameter instanceof Boolean[]) {
            typeName = TYPE_NAME_BOOLEAN;
        } else if (parameter instanceof Double[]) {
            typeName = TYPE_NAME_NUMERIC;
        }

        if (typeName == null) {
            throw new TypeException("ArrayTypeHandler parameter typeName error, your type is " + parameter.getClass().getName());
        }

        // 這3行是關鍵的代碼，創建Array，然後ps.setArray(i, array)就可以了
        Connection conn = ps.getConnection();
        Array array = conn.createArrayOf(typeName, parameter);
        ps.setArray(i, array);
    }

    @Override
    public Object[] getNullableResult(ResultSet resultSet, String s) throws SQLException {
        return getArray(resultSet.getArray(s));
    }

    @Override
    public Object[] getNullableResult(ResultSet resultSet, int i) throws SQLException {
        return getArray(resultSet.getArray(i));
    }

    @Override
    public Object[] getNullableResult(CallableStatement callableStatement, int i) throws SQLException {
        return getArray(callableStatement.getArray(i));
    }

    private Object[] getArray(Array array) {
        if (array == null) {
            return null;
        }
        try {
            return (Object[]) array.getArray();
        } catch (Exception e) {
        }
        return null;
    }

}

使用

List<Student> updateNames(@Param("id") Integer id,@Param("names") Integer... names);

<update id="updateNames">
        update student
        set student_names= #{names,typeHandler = com.sinoxk.drug.config.ArrayTypeHandler}
        where
        id= #{id}
    </update>