MyBatis insert 返回主键的方法

表结构：

/*==============================================================*/
/* Table: Dic_City                                              */
/*==============================================================*/
create table Dic_City (
   ID                   int                  identity ,
   City_Code            varchar( 10)          not null ,
   Provinces_Code       varchar( 20)          not null ,
   State_Code           varchar( 10)          not null ,
   City_Name            varchar( 50)          null ,
   PY_Code              varchar( 50)          null ,
   PY_Code_Short        varchar( 10)          null ,
   Ext1                 varchar( 20)          null ,
   Ext2                 varchar( 20)          null ,
   Ext3                 varchar( 20)          null ,
   Ext4                 varchar( 20)          null ,
   Ext5                 varchar( 20)          null ,
   constraint PK_DIC_CITY primary key ( ID)
)

MyBatisXML配置，下面两种方式都行

方式1:

<insert id= "insert" parameterType= "cn.softsea.model.DicCity" >
  <selectKey resultType= "java.lang.Integer" keyProperty= "id" order= "AFTER" >
    SELECT @@IDENTITY
  </selectKey>
  insert into Dic_City (City_Code, Provinces_Code,
    State_Code, City_Name, PY_Code,
    PY_Code_Short, Ext1, Ext2,
    Ext3, Ext4, Ext5)
  values (#{cityCode,jdbcType=VARCHAR}, #{provincesCode,jdbcType=VARCHAR},
    #{stateCode,jdbcType=VARCHAR}, #{cityName,jdbcType=VARCHAR}, #{pyCode,jdbcType=VARCHAR},
    #{pyCodeShort,jdbcType=VARCHAR}, #{ext1,jdbcType=VARCHAR}, #{ext2,jdbcType=VARCHAR},
    #{ext3,jdbcType=VARCHAR}, #{ext4,jdbcType=VARCHAR}, #{ext5,jdbcType=VARCHAR})
</insert>

方式2:

<insert id= "insert" parameterType= "cn.softsea.model.DicCity" useGeneratedKeys= "true" keyProperty= "id" >
  insert into Dic_City (City_Code, Provinces_Code,
    State_Code, City_Name, PY_Code,
    PY_Code_Short, Ext1, Ext2,
    Ext3, Ext4, Ext5)
  values (#{cityCode,jdbcType=VARCHAR}, #{provincesCode,jdbcType=VARCHAR},
    #{stateCode,jdbcType=VARCHAR}, #{cityName,jdbcType=VARCHAR}, #{pyCode,jdbcType=VARCHAR},
    #{pyCodeShort,jdbcType=VARCHAR}, #{ext1,jdbcType=VARCHAR}, #{ext2,jdbcType=VARCHAR},
    #{ext3,jdbcType=VARCHAR}, #{ext4,jdbcType=VARCHAR}, #{ext5,jdbcType=VARCHAR})
</insert>

调用Mapper返回主键：

//生成新对象用于插入
DicCity city = new DicCity();
city . setCityCode( "330100");
city . setCityName( "杭州市");

//获取mapper对象
DicCityMapper cityMapper = (DicCityMapper) SpringContextUtil.getBean("dicCityMapper");

int row = cityMapper.insert(city);    //insrt不再返回主键，只返回响应行数，这点和ibatis不同了

System.out.println("响应的行数："+row);
//取得自增的标识列 ID的值
System.out.println("新插入的数据的ID："+city.getId());