现在编写代码,总时刻要求自己,不只是实现功能,而且要质量更高。
最近使用ibatis框架,其灵活的sql编写,能够颗粒度的优化,蛮不错的。
另外使用批量insert时,找了好久,终于被我找到一种合适的批量添加操作。强调一下,本人使用的是oracle数据库。
传到DAO层的是一个List集合类
- <insert id="addCkbRedilutedInfo" parameterClass="java.util.List" >
- insert all
- <iterate conjunction =" ">
- into ckb_dna_volume_info
- (dna_num,d_board_name,source_cryovial_id,date_processed,buffer_volume,buffer_reagent,create_user)
- values
- <![CDATA[
- (#list[].gCryovialId:VARCHAR#, #list[].gBoxId:VARCHAR#, #list[].fCryovialId:VARCHAR#, #list[].operatdate:VARCHAR#, #list[].additionalBufferVolume:VARCHAR#, #list[].bufferReagent:VARCHAR#, #list[].operator:VARCHAR#)
- ]]>
- </iterate>
- select * from dual
- </insert>
另外,在网上有另外的两种批量insert的写法,我这边使用oracle+ibatis测试了,行不通,方法如下(提示错误信息:ORA-00936: missing expression):
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- <insert id="addCkbRedilutedInfo" parameterClass="java.util.List" >
- insert into ckb_dna_volume_info
- (dna_num,d_board_name,source_cryovial_id,date_processed,buffer_volume,buffer_reagent,create_user)
- values
- select dna_num,d_board_name,source_cryovial_id,date_processed,buffer_volume,buffer_reagent,create_user from
- (
- <iterate conjunction =" union all ">
- select
- #list[].gCryovialId# as dna_num, #list[].gBoxId# as d_board_name, #list[].fCryovialId# as source_cryovial_id,
- #list[].operatdate# as date_processed, #list[].additionalBufferVolume# as buffer_volume, #list[].bufferReagent# as buffer_reagent,
- #list[].operator# as create_user
- from dual
- </iterate>
- )
- </insert>
另外一种也不能够正常使用如下(提示错误信息:ORA-00933: SQL command not properly ended):
- <insert id="addCkbRedilutedInfo" parameterClass="java.util.List" >
- insert into ckb_dna_volume_info
- (dna_num,d_board_name,source_cryovial_id,date_processed,buffer_volume,buffer_reagent,create_user)
- values
- <iterate conjunction =",">
- <![CDATA[
- (#list[].gCryovialId#, #list[].gBoxId#, #list[].fCryovialId#, #list[].operatdate#, #list[].additionalBufferVolume#, #list[].bufferReagent#, #list[].operator#)
- ]]>
- </iterate>
- </insert>
上述只是在sql里写批量,其实ibatis还可以在DAO层用java代码实现,写法还可以如下:
- try {
- this.getSqlMapClient().startTransaction();
- this.getSqlMapClient().startBatch();
- for(CkbInfo info :infos){
- this.getSqlMapClientTemplate().insert("CKBDNAInfo.addCkbRedilutedInfo", info);</span>
- }
- this.getSqlMapClient().executeBatch();
- this.getSqlMapClient().commitTransaction();
- } catch (SQLException e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- } finally{
- try {
- this.getSqlMapClient().endTransaction();
- } catch (SQLException e) {
- // TODO Auto-generated catch block
- e.printStackTrace();
- }
- }
但是上述方法新开启了事务却导致了事务问题,所以还是用另外一种方式来处理,即基于回调方式的实现(当然,要注意你的数据库游标设置的最大值是多少,尽可能大些,不然会超出游标的最大设置值):
- // 执行回调
- sqlMapClientTemplate.execute(new SqlMapClientCallback() {
- // 实现回调接口
- public Object doInSqlMapClient(SqlMapExecutor executor)
- throws SQLException {
- // 开始批处理
- executor.startBatch();
- for (CkbInfo info :infos) {
- // 插入操作
- executor.insert("CKBDNAInfo.addCkbRedilutedInfo", info);
- }
- // 执行批处理
- executor.executeBatch();
- return null;
- }
- });