- 关于Sequence主键的数据库来说,如:
-
<insert id="add" parameterType="vo.Category">
<selectKey resultType="java.lang.Short" order="BEFORE" keyProperty="id">
SELECT SEQ_TEST.NEXTVAL FROM DUAL
</selectKey>
insert into category (name_zh, parent_id,
show_order, delete_status, description
)
values (#{nameZh,jdbcType=VARCHAR},
#{parentId,jdbcType=SMALLINT},
#{showOrder,jdbcType=SMALLINT},
#{deleteStatus,jdbcType=BIT},
#{description,jdbcType=VARCHAR}
)
</insert>
-
- 自增主键的表,插入时不需要主键,而是在插入过程中获取一个自增的主键,如:
-
<insert id="add" parameterType="vo.Category" useGeneratedKeys="true" keyProperty="id">
insert into category (name_zh, parent_id,
show_order, delete_status, description
)
values (#{nameZh,jdbcType=VARCHAR},
#{parentId,jdbcType=SMALLINT},
#{showOrder,jdbcType=SMALLINT},
#{deleteStatus,jdbcType=BIT},
#{description,jdbcType=VARCHAR}
)
</insert>
或者
<insert id="add" parameterType="vo.Category">
<selectKey resultType="java.lang.Short" order="AFTER" keyProperty="id">
SELECT LAST_INSERT_ID() AS id
</selectKey>
insert into category (name_zh, parent_id,
show_order, delete_status, description
)
values (#{nameZh,jdbcType=VARCHAR},
#{parentId,jdbcType=SMALLINT},
#{showOrder,jdbcType=SMALLINT},
#{deleteStatus,jdbcType=BIT},
#{description,jdbcType=VARCHAR}
)
</insert> 注意:keyProperty="id" 这个id必须是实体的id,而不是数据表的主键id,否则,得不到正确的返回结果;接收返回值的时候必须用实体的get属性,而不能定义变量,否则,接收不到正确的返回结果:即必须用user.getId()来接收。例如int insertAndGetId = pgyMemUserService.insertAndGetId(user);
System.out.println(user.getId());
-
- 数据库表的主键不是自增的类型,一般需要应用层通过代码生成主键。也可以在数据库中生成如下:
- 下面是针对Oracle的写法,Oracle没有autoincrement,而是用触发器实现的 CURRVAL是在触发器中定义的.
<insert id="insert" parameterClass="ProFeeKindObject">
<![CDATA[
INSERT INTO t_pro_feeKind (KINDID,kindName,kindType,enable)
VALUES (seq_t_pro_feekind_id.nextval,#kindName#,#kindType#,#enable#)
]]>
<selectKey resultClass="java.lang.Integer" keyProperty="kindId" >
SELECT seq_t_pro_feekind_id.CURRVAL AS kindId FROM DUAL
</selectKey>
</insert><!-- 下面是针对MySQL的写法 -->
<!--
<selectKey resultClass="int" keyProperty="id" >
SELECT @@IDENTITY AS id
</selectKey>
-->
- 下面是针对Oracle的写法,Oracle没有autoincrement,而是用触发器实现的 CURRVAL是在触发器中定义的.