Question

我是esper的新手，我希望将数据存储在tbl_config中。这是一些esper配置文件：

config.epl

module rms.config;

create table tbl_config(    
        id              java.math.BigDecimal    primary key,
        time            java.math.BigDecimal
);


create schema ConfigListEvent  as (
        id              java.math.BigDecimal,
        time            java.math.BigDecimal
);

@Audit
@Name("LoadConfigDataFromDBRule")
insert into ConfigListEvent
select tbl.ID as id, tbl.time as time
from ImportDataEvent,
    sql: rms ['select * from T_CONFIG'] as tbl;

@Audit
@Priority(1)
@Name("DeleteConfigDataRule")
on ConfigListEvent as evt
delete from tbl_config as tbl where evt.id = tbl.id;

@Audit
@Name("InsertConfigDataRule")
on ConfigListEvent
insert into tbl_config select *;

stat.epl

module rms.stat;
uses rms.config;

@Name("Create-PaymentContext")
create window PaymentWindow.win:time(2 hour) as PaymentRequest;


@Audit
@Name("insertPaymentRequest ")
@Priority(1)
insert into PaymentWindow select * from PaymentRequest;

rule.epl

module rms.rule;
uses rms.config;
uses rms.stat;

@Audit
@Name("xxx")
@Description("check max times per IntervalTime")
on PaymentRequest as pay
select CustomUtil.getEndTime(pay.createTime,tbl_config["time"]) as startTime from PaymentWindow as payWindow;

然后系统启动时出现错误：

com.espertech.esper.epl.expression.core.ExprValidationException: Failed to validate method-chain parameter expression 'tbl_config["time"]': Incompatible type returned by a key expression for use with table 'tbl_config', the key expression '"time"' returns 'java.lang.String' but the table expects 'java.math.BigDecimal'

这让我困惑了几天，谢谢你的帮助！

Answer 1

该表有一个键字段“id”，类型为BigDecimal。然而，表达式tbl_config["time"]提供字符串值“time”作为键而不是BigDecimal值。请尝试tbl_config[id]，假设付款请求中有一个名为“id”的字段，其类型为BigDecimal。

config.epl中的on-delete和on-insert看起来有点尴尬，并且on-merge会使这个易于阅读的语句。

esper如何使用epl创建的表数据

1 个答案: