PostgreSQL 8 for Windows in VS .NET

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PostgreSQL 8 for Windows
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Since the data is separated by commas, you must specify the proper delimiter in the \copy command:
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test=> \copy store"Customer" from datatxt using delimiters ',' \ test=> select * from :cust; CustomerID | LastName | FirstName | Address | City | State | Zip | Phone + + + + + + + BLU001 | Blum | Rich | 123 Main | Chicago | IL | 60633 | 555-1234 BLU002 | Blum | Barbara | 879 Oak | Gary | IN | 46100 | 555-4321 BLU003 | Blum | Katie | 342 Pine | Hammond | IN | 46200 | 555-9242 BLU004 | Blum | Jessica | 229 State | Whiting | IN | 46300 | 555-0921 (4 rows) test=>
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The data converted perfectly for the import If any of the data rows in the text file do not convert properly (such as if they do not satisfy any constraints placed on the columns), the \copy command will produce an error message:
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test=> \copy store"Customer" from datatxt using delimiters ',' \ ERROR: duplicate key violates unique constraint "CustomerKey" CONTEXT: COPY Customer, line 1: "BLU002,Blume,Judy,111 Maple,Hobart,IN, 46700,555-5577" test=>
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Notice that both the error message and the row that produced the error are displayed There is another very important thing to know about errors in the \copy command The \copy command is processed as a single transaction by the database This means that the \copy command is either committed as a whole or rolled back as a whole If you import a 1000-row data file, and row 999 has an error, all of the previously inserted 998 rows will be rolled back and not entered into the database, and the one remaining row will not be processed
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This chapter walked through the features of the psql program, which provides a simple console interface to your PostgreSQL system You can perform database administration functions as well as input, delete, modify, and query the data contained in the database The psql program uses command-line options to allow you to set features used within the application Besides the command-line options, psql also provides its own internal meta-commands These commands consist of shortcuts for performing complex SQL statements (such as copying data from a data file to a table) and commands for setting the format of query results The main language used to interface with the PostgreSQL database is SQL 6 dives into the basics of the SQL language and shows you how to use psql to perform administration and user functions using SQL statements
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PostgreSQL 8 for Windows
hapter 5 showed how to use the psql program to interact with the PostgreSQL system One of the ways to interact with PostgreSQL is to use the standard SQL query language Whether you are accessing your PostgreSQL system from the psql program interface or from a fancy Java or NET application, knowing how to use SQL is an important skill to have The better your SQL skills, the better your application will perform This chapter shows the basics of using SQL to control your PostgreSQL system, and how to insert, delete, and query data
THE SQL QUERY LANGUAGE
When you look at the PostgreSQL feature descriptions on the PostgreSQL web site (www postgresqlorg), they state that PostgreSQL conforms to the ANSI SQL 92/99 standards Unless you are familiar with the database world, you might not know exactly what that means This section explains what the SQL query language is, and how it is used to interact with the database
SQL History
The Structured Query Language (SQL) has been around since the early 1970s as a language for interacting with relational database systems As database systems became more complex, it was clear that a simpler language was needed to interact with databases The first commercial SQL product, called Structured English Query Language (SEQUEL), was released by IBM in 1974 As its name suggests, it was intended to provide a query interface to the database system using simple English words Over the next few years the SEQUEL language was modified, and eventually became known as SQL (which often is pronounced sequel ) As other database vendors attempted to mimic or replace SQL with their own query languages, it became evident that SQL provided the easiest interface for both users and administrators to interact with any type of database system In 1986 the American National Standards Institute (ANSI) formulated the first attempt to standardize SQL The standard was adopted by the United States government as a federal standard, and was named ANSI SQL89 This SQL standard was adopted by most commercial database vendors As you can probably guess from there, additional updates have been made to the ANSI SQL standard over the years, resulting in SQL92 (also called SQL2) and SQL99 (also called SQL3) versions, which are the versions PostgreSQL supports At the time of this writing there is also an ANSI SQL 2003 version that has been published, but PostgreSQL does not claim compatibility with it
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