executereader connection property has not initialized

srctable, IDbCommand command, CommandBehavior behavior)In System.Data.Common.DbDataAdapter.Fill (DataSet DataSet, String srctable)In Ytud. Public.DB.GetDataTable (String Sql, OleDbConnection dbcon) location F:\CsProjects\yytd\standrd2014-9-6\ytud\Public\DB.cs: Line number 57In Ytud. Mainfrm.importdb_importproject (String srcdbfilepath) position F:\CsProjects\yytd\standrd2014-9-6\ytud\Main.cs: line number 2084}This is because the connection object use

Label:Description of the problem: A project involves two data sources, each using two different database connection pools, one of which is the Poxool connection pool, and the problem is that spring starts with only initializing the database connection in one of the database connection pools, and the Poxool configured d

Myini.dbupgrade1 () position Program.cs: line number 348At Program.main () position Program.cs: line number 738} Error Reason:The ConnectionString property has not been initialized. Only the Connection object is created, and the ConnectionString property of the Connection o

Myini.dbupgrade1 () position Program.cs: line number 348In Program.main () position Program.cs: line number 738}cause of error:The ConnectionString property has not been initialized. Only the connection object is created and the ConnectionString property of the Connection o

Alternative solution to "connectionstring attribute not initialized"Now, my friends who are a little familiar with Asp.net are used to writing database connection configurations to the Web. config. the configuration in the database in config is as follows:1 2 3 Use in. CS filesString strconn = configurationmanager. receivettings ["connstring"];To read, it is worth noting that: this is the read method of A

Now, my friends who are a little familiar with Asp.net are used to writing database connection configurations to the Web. config. the configuration in the database in config is as follows:1 2 3 Vs built-in SQL: . CS File Usage:String strconn = configurationmanager. receivettings ["connstring"]; To read, it is worth noting that: this is the read method of ASP. net2.0, in 1.1 isString strconn = configurationsettings. receivettings ["connstring"]; Many f

method generated by the system. Sdisplay is not initialized to nil at the start of the class. Only Xib is loaded by the corresponding Viewcontroller. This variable is set and initialized, and it is permanently initialized throughout the class. So these were set earlier. Attribute variables do not have to be initialized