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By David Sceppa
For each developer who is uttered "I want I knew that ahead of i began writing all this code!" PROGRAMMING ADO demonstrates the best way to shop time, write much less code, and construct more-powerful data-driven suggestions utilizing Microsoft(r) ActiveX(r) facts gadgets (ADO). within the book's first part, the writer expertly courses readers in the course of the ADO item model-sharing his services as a Microsoft Developer help expert at the homes, occasions, and techniques that may current the best demanding situations to the ADO developer. the rest of the booklet is dedicated to assisting builders understand how ADO items behave and development their skillability with ADO programming options. themes comprise connecting to databases; utilizing the Recordset, Command, and list and seek items to retrieve and control info; updating databases; and growing distant info companies. Readers can research the positive aspects of the ADO cursor engine intimately, as a way to find out how cursors paintings, what their boundaries are, find out how to shorten improvement time, and the way to prevent coding themselves right into a nook.
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In fact, the default OLE DB provider is the OLE DB Provider For ODBC Drivers. This provider acts as a translation layer between OLE DB and ODBC. In the connection string, this provider is listed as MSDASQL and is often referred to by its code name, Kagera. You can use this provider with an ODBC DSN—user, system, or file—or with a connection string that doesn't have a DSN. Here are some examples: "Provider=MSDASQL;DSN=MyUserDSN;UID=MyUID;PWD=MyPwd;" "Provider=MSDASQL;DSN=MySystemDSN;UID=MyUID;PWD=MyPwd;" "Provider=MSDASQL;FileDSN=MyFileDSN;UID=MyUID;PWD=MyPwd;" "Provider=MSDASQL;Driver={SQL Server};Server=MyServer; Database=MyDatabase;UID=MyUID;PWD=MyPwd;" My recommendation is to use a native OLE DB provider if one is available.
BeginTrans 'Commit the transaction. CommitTrans 'Because we've set the Attributes property to include ' adXactCommitRetaining, CommitTrans began another transaction. 'Reset the Attributes property to the default and call ' CommitTrans again before closing the transaction. Close Set cnDatabase = Nothing IsolationLevel Property If you're building a database application that will simultaneously handle transactions from multiple users, you need to know something about transaction isolation levels. Since entire books—such as Principles of Transaction Processing for the Systems Professional, by Philip A.
SQL-92 is an ANSI standard for data access. SQL Server supports all four SQL-92 isolation levels, shown in the following table, and uses the Read Committed isolation level by default. You can set the ADO Connection object's IsolationLevel property to use any of the four SQL-92 isolation levels. SQL-92 Isolation Levels 38 Dirty Read Nonrepeatable Read Phantom Row Managing Your Transactions Component Services and the Distributed Transaction Coordinator 39 Read Uncommitted Yes Yes Yes Read Committed No Yes Yes Repeatable Read No No Yes Serializable No No No A word of caution: Leave this feature alone unless you know what you're doing and you've discussed your plans with your database administrator.