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原标题:MyBatis MapperProvider MessageFormat拼接批量SQL语句执行

浏览次数:58 时间:2020-03-17

1.以下是Mapper接口的部分代码

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 (isize-1) sb.append(",");}
@Transactionalpublic void synchLotWithVehicleCodeToLocalDB(ListLotWithVehicleCodeBO lotWithVehicleCodeBOs){ if(null != lotWithVehicleCodeBOs && lotWithVehicleCodeBOs.size()0){printMapper.insertAllLotWithVehicleCode(lotWithVehicleCodeBOs);}}

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。

(#{list[1,000].lotCode },#{list[1,000].productVehicleCode })

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 ""}

public interface PrintMapper{@InsertProvider(type = PrintMapperProvider.class,method = "insertAllLotWithVehicleCode4H2") void insertAllLotWithVehicleCode(ListLotWithVehicleCodeBO lotWithVehicleCodes);}

3.service层

异常已指明SQL语句构建问题,DEBUG进去:

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
public String insertAllLotWithVehicleCode4H2(MapString,ListLotWithVehicleCodeBO map){ListLotWithVehicleCodeBO 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();}

威尼斯wns.9778官网,问题根源:

2.对应MapperProvider中函数片段

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:

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