SqlDataReader 可用于检索请求行的SqlDataReader对象。 例外 ArgumentException asyncResult参数为 null(在 Microsoft Visual Basic 中为Nothing) InvalidOperationException 不止一次为单个命令执行调用了EndExecuteReader(IAsyncResult),或该方法不匹配其执行方法(例如,代码调用了EndExecuteReader(IAsyncResult)以完成对Beg...
Data.SqlClient 組件: Microsoft.Data.SqlClient.dll 套件: Microsoft.Data.SqlClient v5.2.0 完成Transact-SQL 陳述式的非同步執行,以 XML 傳回要求的資料。 C# 複製 public System.Xml.XmlReader EndExecuteXmlReader(IAsyncResult asyncResult); 參數 asyncResult IAsyncResult 呼叫IAsyncResult 所傳回的 Begin...
select t.label_cn 机架名称, (select label_cn from room where cuid = t.RELATED_ROOM_CUID union all select label_cn from ACCESSPOINT where cuid = t.RELATED_ROOM_CUID) AS 所属机房,pkg_irms.get_city(t.related_district_cuid) 地市,(SELECT wmsys.wm_concat(DISTINCT TL.L...
ERROR 1142(42000): SELECT command denied to user ‘b’@‘localhost’ for table ’test’ 有权限就继续执行,打开表的时候,执行器根据表的引擎定义,去使用这个引擎提供的接口。 比如我们这个例子中的表 test,ID 字段没有索引的话,执行器的执行流程是这个样的: 调用InnoDB 引擎接口获取表的第一行,判断 ID ...
. Unless there are unrelated errors, one of those two outcomes is guaranteed. If a conflict originates in another transaction whose effects are not yet visible to theINSERT, theUPDATEclause will affect that row, even though possiblynoversion of that row is conventionally visible to the command....
PL/SQL语句可以在Oracle客户端的 SQL窗口或者 command 窗口中运行 shirayner 2018/08/10 8790 MySQL条件判断IF,CASE,IFNULL语句详解 expressionmysql函数统计case 1.IF语句的基本用法 IF(condition, true_statement, false_statement); condition: 条件表达式,可以是任何返回布尔值的表达式。 true_statement: 如果条件为...
SqlCommandxs:stringThe SQL command that was executed. AppDomainxs:stringThe string returned by AppDomain.CurrentDomain.FriendlyName. Sodelujte z nami v storitvi GitHub Vir za to vsebino najdete v storitvi GitHub, kjer lahko tudi ustvarite in pregledate težave in zahtevke za uveljavitev...
string sql = @" SELECT TABLE_NAME FROM DemoDB.INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE = 'BASE TABLE'"; using (SqlConnection connection = new SqlConnection(ConnectionString)) { SqlCommand command = new SqlCommand(sql, connection); command.Connection.Open(); SqlDataReader reader = command.Exec...
system command was used to delete files, then use RMAN CROSSCHECK and DELETE EXPIRED commands. 选择:清理归档日志文件方法: 双实例的oracle启动---注意:首先要export ORACLE_SID=要操作的实例名 保证自己操作的实例是需要删除归档日志文件的实例,然后进行删除步骤: ...
thread/sql/one_connection TYPE: FOREGROUND PROCESSLIST_ID: 288978020 PROCESSLIST_USER: [redacted] PROCESSLIST_HOST: [redacted] PROCESSLIST_DB: [redacted] PROCESSLIST_COMMAND: Query PROCESSLIST_TIME: 1083545 PROCESSLIST_STATE: query end PROCESSLIST_INFO: SELECT * FROM [table] WHERE [index_col] = [in...