Có 80+ tài liệu thuộc chủ đề "Giáo trình SQL Server 2008"
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A SQL script may be executed by running the SQLCMD command-line utility and passing the SQL script file as a parameter.. The SQLCMD utility has several parameters and may be configured to meet nearly any command-line need.. Simple comments may be embedded within a single SQL command:. A benefit of bracketed comments is that a large multi-line query within the...
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Examining SQL Server with Code. One of the benefits of using SQL Server is the cool interface it offers to develop and administer the database. Introduced in SQL Server 2005, dynamic management views (DMVs) offer a powerful view into the structure of SQL Server and the databases, as well as the current SQL Server status (memory, IO, etc.).. o2.NAME AS...
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In the following example cursor loop, a row is inserted and deleted so that you can test how data changes affect the different types of cursors:. Step 1 / Declare the Cursor. Step 2 / Open the Cursor OPEN cLocation;. Step 3 / Prime the Cursor FETCH cLocation. perform some work with the data. Step 3 / Iterating through the...
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T-SQL Error Handling. Legacy error handling Try/catch blocks Rethrowing errors. S o an atom goes into a bar and says to the barkeeper, ‘‘Hey, I think I’ve lost an electron.’’. Lame, I know, but it’s my favorite geek joke. Back to SQL, despite our best efforts, any application can lose an electron every once in a while — the trick...
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If the error is one that the stored procedure logic detects, and it’s not a SQL Server error, then raise the error message so that the user or front-end application is informed.. Optionally, log the error to an error table.. If it’s a stored procedure, user-defined function, or trigger, then terminate it with a RETURN command.. When an error occurs...
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Because the result set of the stored procedure is returned via a function being used by a data source in the FROM clause of the SELECT statement, a WHERE clause can further reduce the output of the stored procedure.. While this technique enables the use of stored procedures within a SELECT statement, it’s not as opti- mized as the technique...
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The next chapter covers user-defined functions, which combine the benefits of stored procedures with the benefits of views at the cost of portability.. Building User-Defined Functions. S QL Server 2000 introduced user-defined functions (UDFs), and the SQL Server community was initially slow to adopt them. I’ve solved several nasty problems using user-defined functions.. In addition, user-defined functions can accept parameters,...
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Part IV Developing with SQL Server. With this usage, rows from the main query are included in the result set regardless of whether the virtual table returned by the user-defined function is empty.. All three types of user-defined functions may be created with the significant added benefit of schema binding. Views may be schema bound. in this way, UDFs are...
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Person.Person iuPerson after enabled. Only users who are members of the sysadmin fixed server role, or are in the dbowner or ddldmin fixed database roles, or are the tables’ owners, have permission to create, alter, drop, enable, or disable triggers.. Code within the trigger is executed assuming the security permissions of the owner of the trigger’s table.. Working with the...
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SELECT @ProdID = ProductID FROM dbo.Product. SELECT @LocationID= LocationID FROM dbo.Location. INSERT dbo.Inventory (ProductID, InventoryCode, LocationID) VALUES (@ProdID,’A1’, @LocationID);. SELECT P.Code, I.InventoryCode, I.QuantityOnHand FROM dbo.Inventory AS I. INNER JOIN dbo.Product AS P ON I.ProductID = P.ProductID;. With each row inserted into the InventoryTransaction table, the trigger updates the Inventory table. CREATE TRIGGER InvTrans_Aggregate ON dbo.InventoryTransaction AFTER Insert. UPDATE dbo.Inventory. i.Value...
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Nielsen c27.tex V pm Page 662. Developing DDL Triggers. In some way, a DDL trigger is easier to write than a DML trigger because DDL triggers always fire for a single event, whereas DML triggers must handle events with multiple affected rows involving the base table, and the inserted and deleted virtual tables.. The complexity of the DDL trigger results...
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Dynamic SQL and Code Generation. Executing dynamic SQL Parameterized queries The risk of SQL injection Generating stored procedures Alternatives to dynamic SQL. Nordic (New Object/Relational Design) is essentially a code-generation tool that uses dynamic SQL to create tables, stored procedures, and views. The term dynamic SQL has a couple of differing definitions. It’s more accurate to say that dynamic SQL...
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Nielsen c29.tex V pm Page 682. Part IV Developing with SQL Server. Where can an SQL injection string be used to alter the intention of the code?. If you’re up to writing code-generating code in T-SQL, you’re doing well as a SQL Server database developer. Nielsen p05.tex V pm Page 683. Chapter 30 Bulk Operations Chapter 31. Access as a...
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W hile SQL Server can handle the technical problems of querying external data, if the two systems are in fact two separate applications, then directly accessing an external data store will likely violate the principle of encapsulation. and coupling the two data stores reduces the flexibility of the architecture. Instead, consider using a middle tier that communicates with each of...
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SQL Server can’t perform a distributed query that accesses an Excel spreadsheet while that spreadsheet is open in Excel.. Not surprisingly, SQL Server links easily to MS Access databases. SQL Server uses the OLE DB Jet provider to connect to Jet and request data from the MS Access .mdb file.. Prior to the conversion to SQL Server, the Cape Hatteras...
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The following example demonstrates a distributed transaction between the local SQL Server and the second instance:. Rolling back a nested SQL Server local transaction rolls back all pending transactions. SQL Server’s ability to leverage OLE DB and ODBC to perform distributed queries is a key factor in the success of many database projects, and knowing how to build distributed queries...
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Most of these object types have a counterpart in predecessor technologies that Microsoft has introduced, although the level of ADO-object functionality is much greater than that offered by previ- ous technologies and, as demonstrated next, the potential usability for more recent technologies such as ADO.NET and XML transcends even ADO.. Even when ADO is used through the provided .NET primary...
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DataSets may be typed or untyped in ADO.NET. Transaction Implemented in ADO.NET 2.0. The ADO.NET transaction is, by default, a lightweight transactional container for a single data source. Five managed providers are included in ADO.NET 3.5:. OleDb: The bridge provider for using OLEDB providers in ADO.NET. SqlClient: The Microsoft provider for SQL Server 7.0 and later. Just as the OLEDB...
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By default, every .NET application domain — the basic unit of isolation in the CLR — contains a DefaultTraceListener , and can contain other listeners in its collection. Normally the role of the trace listener is to direct trace output to a file or the event log. Trace switches can also be defined by the developer to produce various levels...
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These databases are installed as part of the Microsoft SQL Server installation. On the New Project dialog, make sure that .NET Framework 3.5 is selected. Right-click on the project (it will be called SyncFrameworkDemo) in Solution Explorer and select Add. In the Add New Item dialog, select the Data category tab, and then select the Local Database Cache tem- plate....