MyBatis MapperProvider MessageFormat拼接批量SQL语句执行报错的原因分析及解决办法

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<lotwithvehiclecodebo> lotwithvehiclecodes);
}

2.对应mapperprovider中函数片段

public string insertalllotwithvehiclecode4h2(map<string,list<lotwithvehiclecodebo>> map)
{
list<lotwithvehiclecodebo> 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<lotwithvehiclecodebo> 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<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+""}