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Now the FETCH command displays the first record in the result set When the transaction is ended (using the COMMIT command), the all_customers cursor goes away You can also close the cursor before the transaction ends by using the CLOSE command Be careful when using cursors in transactions where you insert, delete, or modify data Remember, the cursor only returns the records (and their values) at the time of the query in the DECLARE command (sort of a snapshot of the table) Any modifications to the data after that time, even if the cursor is still open, do not appear in the cursor results This can cause huge problems if you do not remember this rule The best way to get comfortable with cursors is to play around with them It is usually not until you make a few mistakes that you will get a true understanding of how cursors work within the result set
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This chapter continued the journey through SQL commands First, a recap of the SELECT command was presented, along with the full command format and descriptions There are lots of features involved in the SELECT command for producing queries Next, using views was discussed Views allow you to create temporary tables combining columns from multiple tables This can help simplify complex queries, and also give your customers a single place to look for data, rather than having to hunt through several tables in the database After views, helping speed up queries using table indexes was shown Just as a book index helps you to find topics in a book, table indexes help PostgreSQL to find data in tables quicker and easier Indexes on columns that are often used for queries can often speed up the query process However, overusing indexes can be a detriment to database performance As each new record is inserted into a table, all of the associated table indexes must be updated as well Transactions can be used to help keep the data in tables consistent A transaction groups a set of SQL commands into a single block that is either processed or rejected by PostgreSQL If a single command within the block fails, PostgreSQL undoes, or rolls back, the results of all the previous commands in the transaction Savepoints can be set within long transactions to provide places for PostgreSQL to roll back to within the transaction This allows some commands within the transaction to succeed, even if future commands fail Finally, cursors were discussed Cursors allow you to walk through the result set from a SELECT command They allow you to move both forward and backward through the result set to examine the records contained in the result set The next chapter continues showing how to use SQL in PostgreSQL PostgreSQL provides many built-in functions that can be used in your SQL commands 8 discusses these functions, and shows how to use them to simplify your applications
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hen handling data in a table, applications are often required to perform functions with the data, such as obtaining the square root of a value, totaling the values in a column, or converting a text value to all upper- or lowercase letters Instead of having to write code in your application to do these types of functions, PostgreSQL provides many commonly used functions for you All you need to do is include the PostgreSQL functions directly in your SQL commands This chapter walks through the built-in PostgreSQL data functions and shows how to use them in your applications
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Functions are used by the database engine to manipulate data contained in the tables The database engine provides functions to help database programmers minimize the amount of code required in an application program to manipulate data contained in tables Instead of having to write code for basic calculations, such as adding numbers to a column data value, summing column data values, determining averages, or converting strings to integers, the programmer can utilize functions already provided by the database engine While the ANSI SQL standards include some generic functions that should be implemented, they do not specify the exact format of the functions Thus, any functions available within a particular database engine are designed purely by the database engine developers There is no guarantee that a function present in one database engine is portable to other database engines That said, many functions available within current database engines are somewhat consistent between vendors The PostgreSQL developers have included many functions within the PostgreSQL database engine to assist you with your database programming needs The following sections describe the basics of functions in the PostgreSQL database engine
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