odbc

问题 Is there a generic way to retrieve a database schema using ODBC that works across databases? If not, what is the easiest way to do this when the database server is MS SQL Server? I am working with unixodbc, from Linux. 回答1: Query against the INFORMATION_SCHEMA views. Beautiful thing about using information schema is that it's a standard so it should be portable to any database that has implemented the standard. e.g. SELECT * FROM INFORMATION_SCHEMA.COLUMNS ISC The standard is the SQL-92

问题 I've got a SQLServer Database and an application (.NET) that configures data on that database. On the other hand, I've got an application (VC++) that reads that data from the database and must be 'informed' a soon as possible of any change in the data saved on the database. I would like to receive a signal from the database engine when some data had been changed by the first app. Of course, I can code some kind of message that comunicates both apps but my question is if exists that mechanism

问题 can someone please help me with this? i need to check through the System DSN for my ODBC connection to the AS400 servier and create a System DSN if a particular one does not exist. i've tried googling and have not been able to find anything good for me. btw, i am quite new to programming. any help will be much appreciated. thank you 回答1: After going through the few less complicated examples available online, this is what i managed to come up with (and it works fine for me). using System;

问题 I'm very new to Qt and C++ I'm trying to connect to an ODBC db, but I'm getting the following output QSqlDatabase: QODBC driver not loaded QSqlDatabase: available drivers: QSQLITE How do I load ODBC in Qt . CODE : QString serverName = "LOCALHOST\\SQLEXPRESS"; QString dbName = "test"; QSqlDatabase db = QSqlDatabase::addDatabase("QODBC"); db.setConnectionOptions(); QString myCon = QString("DRIVER={SQL Native Client};SERVER=%1;DATABASE=%2;Trusted_Connection = Yes").arg(serverName).arg(dbName);

问题 i have to use a custom odbc driver. All i need to pass as a connection string is the DSN. How do i do this with (fluent)nhibernate? FluentNHibernate.Cfg.Db does only offer a OdbcConnectionStringBuilder class with an DSN method. How do i use this? 回答1: You can create your own OdbcConfiguration class that derives from PersistenceConfiguration . Depending on your database, you will have to replace the Dialect in the following class. public class OdbcConfiguration : PersistenceConfiguration

问题 I've spent the last couple days trying to get ODBC installed and I am about to lose my mind, I'm way out of my element here. Please can some one help me before I fall to pieces. Here's what I'm trying: 1) Download 1.7.2 source code package found here (I'm using 1.7.2): http://www.mamp.info/en/downloads/index.html 2) CD into the php directory. 3) Run "/configure --with-iodbc=shared" 4) Run "make" 5) Copy the ./modules/odbc.so file into MAMP/bin/PHP5/lib/php/extensions/no-debug-non-zts-20050922

问题 I am executing below commands in R: dbhandle <- odbcDriverConnect('driver={SQL Server};server=serveripaddress;database=DBName;uid=sa;pwd=pwd;') FactActivity <- sqlQuery(dbhandle, "SELECT DimCourseID,DimPatientID FROM DWH.FactActivity", as.is=TRUE) nrow(FactActivity) In my database I have total 238634 rows but in R I am getting total rows = 237652 . This is happening for all tables (I tried it for three tables). Any idea what am I missing which is reducing no of rows in my resultset in R? 回答1:

问题 I'm having a problem opening a DBF file - I need to open it, read everything and process it. I tried several solutions (ODBC/OLEDB), several connection string, but nothing worked so far. The problem is, when I execute the SQL command to get everything from the file, nothing gets returned - no rows. What's even more odd, the content of the DBF file being opened get deleted. See the code I have: public override bool OpenFile(string fileName, string subFileName = "") { OleDbConnection con = new

问题 Our product is a TCP listening transaction processor. Incoming connections are assigned a thread to handle the connection and a DB connection to work with. Rather than costly approach of establishing new DB connection for each incoming client connection, we maintain a pool of database connections. The database connection pool fairly configurable: min / max sizes, growth rates, etc. Some details: Platform is Windows 2003 / 2008 R2 DB is SQL Server 2005 / 2008 R2 Connection method is ODBC

问题 I know pyodbc is an older project and probably more featureful and robust, but is there anything about its design (based on components of compiled C code), that would make it preferable to a pure Python implementation, such as pypyodbc? I do a lot of ETL work and am thinking of switching from a Linux/Jython/JDBC approach to Windows/Cygwin/Python/ODBC approach. 回答1: Potential advantages of pyodbc over pypyodbc by being written in C would be: speed - see the pypyodbc wiki comparison more