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。
代码
sql;">
public interface PrintMapper
{
@InsertProvider(type = PrintMapperProvider.class,method = "insertAllLotWithVehicleCode4H2") void insertAllLotWithVehicleCode(List lotWithVehicleCodes);
}
函数片段
> 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();
}
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:
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:
当size达到3位数以上时构建出的message为:
解决办法:messageFormat.format(new Object[]{i+""}
原文链接:https://www.f2er.com/mssql/62908.html