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13. A(n) ____________ is a designated marker within your transaction that acts as a rollback
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14. You want to create a savepoint named svpt_Section2. What SQL statement should you use 15. You create a transaction that includes four savepoints: Section1, Section2, Section3, and
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Section4. Near the end of the transaction, after all four savepoints, you define a RELEASE SAVEPOINT that specifies the Section2 savepoint. Which savepoint or savepoints are removed from the transaction when the RELEASE SAVEPOINT statement is executed
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A Section1 B Section2 C Section3 D Section4 16. What circumstances will terminate a transaction 17. You re creating a ROLLBACK statement in your transaction. You want the rollback to undo
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18. You re creating a COMMIT statement in your transaction. After the transaction is
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terminated, you want a new transaction to be initiated. The new transaction should be configured with the same transaction modes as the first transaction. How should you create your COMMIT statement
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SQL: A Beginner s Guide
Key Skills & Concepts
Invoke SQL Directly Embed SQL Statements in Your Program Create SQL Client Modules Use an SQL Call-Level Interface
hroughout this book, you have been performing Try This exercises and testing examples by using a client application to work interactively with your SQL database. For example, you might have been using SQL Server Management Studio to access a SQL Server database, SQL*Plus or iSQL*Plus to access an Oracle database, or perhaps the MySQL Command Line Client to access a MySQL database. This method of data access is referred to as direct invocation, or interactive SQL. The SQL:2006 standard also provides for the use of other types of data access, including embedded SQL, SQL client modules, and the call-level interface (CLI); however, the types of data access supported by an SQL implementation often vary from product to product. Some, for example, do not support embedded SQL, and few support SQL client modules. In this chapter, I introduce you to the four types of data access methods and explain how they can be used to retrieve and modify data in your SQL database. Because SQL and CLI are the two methods most commonly used by programs to access SQL data, I cover these two topics in greater detail than direct invocation and SQL client modules, although I do provide a foundation in all four access types.
Invoke SQL Directly
If you ve gotten this far in the book, you should already be very comfortable with interactive SQL. By using your client application, which comes with most database management products, you ve been able to create ad hoc SQL statements that return immediate results to the application. These results are normally displayed in a window separate from where you executed your SQL statement. For example, let s take a look at Figure 17-1, which shows SQL Server Management Studio. Notice that the top window includes a SELECT statement and the bottom window includes the query results from executing that statement. Most direct invocation client applications behave in a manner similar to this. The types of SQL statements supported by the direct invocation method can vary from one SQL implementation to the next. Although most implementations will allow you to execute basic types of statements, such as SELECT or UPDATE, they might not allow you to execute statements specific to another method of data access. For example, some implementations might not allow you to declare a cursor within an interactive environment. Despite the differences among SQL implementations, the SQL standard does define which types of statements should be supported in an interactive environment. These include SELECT,
17:
Accessing SQL Data from Your Host Program
Figure 17-1
SQL Server Management Studio (SQL Server 2005 and 2008)
INSERT, UPDATE, and DELETE statements and statements related to schema definitions, transactions, connections, and sessions. You should also be able to declare temporary tables in an interactive environment. In fact, nearly any actions critical to the maintenance of data and of the underlying database structure should be supported by direct invocation. One of the main advantages to interactive SQL in addition to the ability to execute ad hoc statements is the elimination of any impedance mismatch. As you ll recall from earlier discussions, an impedance mismatch can occur because of differences in data types between SQL and application programming languages and in how query results (result sets) are handled between SQL and those languages. However, interactive SQL is a pure SQL environment, which means that only the data types supported by the implementation can be used, and result sets pose no problems to the client application because you can simply scroll through query results. It is also common for application developers to use interactive SQL to test the SQL statements they intend to embed in other modules. Even so, direct invocation represents only a small percentage of users. You ll find that most data access is through embedded SQL and CLI-type mechanisms, and some through SQL client modules, but relatively few users rely solely on interactive SQL.
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