最近在項目中有這么一段代碼：下載服務器基礎業務數據進行本地批量插入操作，因項目中使用mybatis進行持久化操作，故直接考慮使用mybatis的批量插入功能。
1.以下是Mapper接口的部分代碼
public interface PrintMapper
{
@InsertProvider(type = PrintMapperProvider.class,method = "insertAllLotWithVehicleCode4H2") void insertAllLotWithVehicleCode(ListLotWithVehicleCodeBO> lotWithVehicleCodes);
}
2.對應MapperProvider中函數片段
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();
}
3.service層
@Transactionalpublic void synchLotWithVehicleCodeToLocalDB(ListLotWithVehicleCodeBO> lotWithVehicleCodeBOs)
{ if(null != lotWithVehicleCodeBOs lotWithVehicleCodeBOs.size()>0)
{
printMapper.insertAllLotWithVehicleCode(lotWithVehicleCodeBOs);
}
}
程序上線的時候沒有發生問題，在業務量猛增的時候，大約同時執行500條以上的時候程序就開始報錯：
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
異常已指明SQL語句構建問題，DEBUG進去：
問題根源：
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 (isize-1) sb.append(",");
}
當size達到3位數以上時構建出的message為：
(#{list[1,000].lotCode },#{list[1,000].productVehicleCode })
解決辦法：messageFormat.format(new Object[]{i+""}
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