EF "There is already an open DataReader associated with this Command which must be closed first."

1.出现问题场景1:在插入数据之前,先进行判断是否存在执行SqlDataReader.Read之后,如果还想用另一个SqlCommand执行Insert或者Update操作的话,会得到一个错误提示:There is already an open DataReader associated with
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Oracle 11.2.0.1 ADG环境MRP进程遭遇ORA-600异常终止

环境:Linux + Oracle 11.2.0.1 ADG现象:发现备库没有应用日志1. 数据库查询备库目前状态发现备库目前没有应用日志,apply lag已经显示备库有3天21小时多没有应用日志。SQL> set linesize 1200SQL> SELECT OPEN_MODE,
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[转]RadStudio DELPHI/C++ BUILDER Berlin 10.1 Update2安装破解教程

源链接:http://bbs.fishc.com/thread-76730-1-1.html 免责声明:本教程所有资源均为学习交流之用,软件和资料版权归原开发公司所有,请于下载后24小时内删除,禁止用于任何商业行为!若因私自散布造成法律问题,论坛概不负责。若您喜欢该软件,请购买正版。本论坛
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linux ad7606 驱动解读

本文记录阅读linux ad7606驱动的笔记。主要文件drivers/staging/iio/adc/ad7606_spi.cdrivers/staging/iio/adc/ad7606_core.cdrivers/staging/iio/adc/ad7606_ring.cdrivers/stag
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POJ 2409 Let it Bead

RT.#include<iostream>#include<cstdio>#include<cstring>#include<algorithm>using namespace std;long long c,s,ans=0;long long f_p
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POJ 1286 Necklace of Beads

Polya定理。#include<iostream>#include<cstdio>#include<cstring>#include<algorithm>using namespace std;long long tab[50],n,ans=0;lo
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[GraphQL] Add an Interface to a GraphQL Schema

As we start building out more complex GraphQL schemas, certain fields start to repeat across different types. This is a perfect use-case for the Inter
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Oracle中的填充函数lpad和rpad的用法(转)

原文链接:http://blog.csdn.net/myzhanglt/article/details/7392999今日学习遇到一个不熟悉的函数LPAD,查了一下文档,将其用法总结如下:Lpad Function:在PL/SQL中用于往源字符串的左侧填充一些字符。函数参数:lpad( string
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[LeetCode] Add Two Numbers II 两个数字相加之二

 You are given two linked lists representing two non-negative numbers. The most significant digit comes first and each of their nodes contain a s
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mvc AddImplicitRequiredAttributeForValueTypes

1、AddImplicitRequiredAttributeForValueTypes (为值类型添加隐式必填验证),默认值 为true。刚在mvc view(html)中会为model的值类型属性(int,double,decimal,datetime等)自动添加data-val-required
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