MyBatis MapperProvider MessageFormat拼接批量SQL语句执行报错
发布时间:2016-11-27 17:33:10 所属栏目:大数据 来源:站长网
导读:最近在项目中有这么一段代码:下载服务器基础业务数据进行本地批量插入操作,因项目中使用mybatis进行持久化操作,故直接考虑使用mybatis的批量插入功能。 1.以下是Mapper接口的部分代码 public interface PrintMapper{@InsertProvider(type = PrintMapper
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最近在项目中有这么一段代码:下载服务器基础业务数据进行本地批量插入操作,因项目中使用mybatis进行持久化操作,故直接考虑使用mybatis的批量插入功能。 1.以下是Mapper接口的部分代码
public interface PrintMapper
{
@InsertProvider(type = PrintMapperProvider.class,method = "insertAllLotWithVehicleCode4H2") void insertAllLotWithVehicleCode(Listlt;LotWithVehicleCodeBOgt; lotWithVehicleCodes);
}
2.对应MapperProvider中函数片段
public String insertAllLotWithVehicleCode4H2(Maplt;String,Listlt;LotWithVehicleCodeBOgt;gt; map)
{
Listlt;LotWithVehicleCodeBOgt; lotWithVehicleCodeBOs = map.get("list");
StringBuilder sb = new StringBuilder("INSERT INTO MTC_LOT_WITH_VEHICLE_CODE (LOT_CODE,PRODUCT_VEHICLE_CODE) VALUES ");
MessageFormat messageFormat = new MessageFormat("(" +
"#'{'list[{0}].lotCode }," +
"#'{'list[{0}].productVehicleCode }" +
")"); int size = lotWithVehicleCodeBOs.size(); for (int i = 0; i lt; size; i++)
{
sb.append(messageFormat.format(new Object[]{i}));
if (i lt; size - 1) sb.append(",");
}
return sb.toString();
}
3.service层
@Transactionalpublic void synchLotWithVehicleCodeToLocalDB(Listlt;LotWithVehicleCodeBOgt; lotWithVehicleCodeBOs)
{ if(null != lotWithVehicleCodeBOs lotWithVehicleCodeBOs.size()gt;0)
{
printMapper.insertAllLotWithVehicleCode(lotWithVehicleCodeBOs);
}
}
程序上线的时候没有发生问题,在业务量猛增的时候,大约同时执行500条以上的时候程序就开始报错:
Caused by: org.apache.ibatis.builder.BuilderException: Improper inline parameter map format. Should be: #{propName,attr1=val1,attr2=val2}
at org.apache.ibatis.builder.SqlSourceBuilder$ParameterMappingTokenHandler.buildParameterMapping(SqlSourceBuilder.java:89)
at org.apache.ibatis.builder.SqlSourceBuilder$ParameterMappingTokenHandler.handleToken(SqlSourceBuilder.java:43)
at org.apache.ibatis.parsing.GenericTokenParser.parse(GenericTokenParser.java:25)
at org.apache.ibatis.builder.SqlSourceBuilder.parse(SqlSourceBuilder.java:24)
at org.apache.ibatis.builder.annotation.ProviderSqlSource.createSqlSource(ProviderSqlSource.java:57)
... 61 more
异常已指明SQL语句构建问题,DEBUG进去: 问题根源:
MessageFormat messageFormat = new MessageFormat("(" +
"#'{'list[{0}].lotCode }," +
"#'{'list[{0}].productVehicleCode }," +
")");
int size = lotWithVehicleCodeBOs.size();
for (int i = 0; i lt; size; i++)
{
sb.append(messageFormat.format(new Object[]{i}));
if (ilt;size-1) sb.append(",");
}
当size达到3位数以上时构建出的message为:
(#{list[1,000].lotCode },#{list[1,000].productVehicleCode })
解决办法:messageFormat.format(new Object[]{i+""} (编辑:南平站长网) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |


