MyBatis insert 返回主键的方法

数据库：SqlServer2005，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());

如果使用mybatis.generator来生成DAO层的话，generatorConfig.xml中要使用：

<generatedKeycolumn="id"sqlStatement="MySql"identity="true"/>