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发布时间:2016-01-27 作者:网络 阅读:185次

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(List lotWithVehicleCodes);
}

2.对应MapperProvider中函数片段

public String insertAllLotWithVehicleCode4H2(Map> map)
{
List 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 < size; i++)
{
sb.append(messageFormat.format(new Object[]{i})); 
if (i < size - 1) sb.append(",");
} 
return sb.toString();
}

3.service层

@Transactionalpublic void synchLotWithVehicleCodeToLocalDB(List lotWithVehicleCodeBOs)
{ if(null != lotWithVehicleCodeBOs && lotWithVehicleCodeBOs.size()>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 < size; i++)
{
   sb.append(messageFormat.format(new Object[]{i})); 
  if (i

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+""}

关键字词:MsSql  

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