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With these data type restrictions in mind, you can create a new PostgreSQL database environment for your Access application It is best to create a new schema for the Access application, then create each existing Access table as a separate table in the new schema Each query, form, and report designed in the Access application will be changed to point to the new PostgreSQL table As an example, I will use an Access application created for a silent auction Many nonprofit organizations use the silent auction along with dinner parties to help raise money Items are placed out on tables, and bidders are allowed to roam through the areas examining the items A bidder places a bid on an item by writing an assigned bidder number along with the bid on a card next to the item At the end of the evening, items are won by the bidder who wrote down the highest bid value for the item This application uses four tables The Bidder table tracks personal information on each bidder, and assigns a unique bidder number to each bidder The Donor table tracks information on people and companies who donate items for the auction The Item table tracks information on the individual items donated, and tracks the winning bid information on the item Finally, the Payment table tracks payments made by bidders at the end of the evening This application environment can be created as a separate schema in the test database used earlier in this book If you have not created the test database, you can do that from pgAdmin III (see 4) or by using the CREATE DATABASE SQL command in psql (see 5) Remember, you must be logged in as the superuser account (postgres by default) to create a new database Once the test database is created, you can create the application tables and accounts using SQL commands Here is the SQL used to create this application environment:
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create schema auction; create table auctionbidder ( bidderkey int4 primary key not null, lastname varchar, firstname varchar, address varchar, city varchar, state char, zip char(5), phone varchar); create table auctiondonor ( donorkey char(6) primary key not null, name varchar, address varchar, city varchar, state char, zip char(5), phone varchar);
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Microsoft Access and PostgreSQL
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create table auctionitem ( itemkey char(6) primary key not null, description varchar, donorkey char(6) not null, resalevalue float4, finalbid float4, bidderkey int4, foreign key (donorkey) references auctiondonor, foreign key (bidderkey) references auctionbidder); create table auctionpayment ( paymentid int4 primary key not null, bidderkey int4, amount float4, foreign key (bidderkey) references auctionbidder); create role auctioneer with nologin; create role earl in role auctioneer; alter role earl login password 'auction' inherit; grant grant grant grant grant usage on schema auction to auctioneer; all on auctionbidder to auctioneer; all on auctiondonor to auctioneer; all on auctionitem to auctioneer; all on auctionpayment to auctioneer;
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To easily execute the SQL, copy the commands into a text file called auctionsql Then you can use the psql program to load the commands into the database to create the objects:
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C:\Program Files\PostgreSQL\82\bin>psql -f auctionsql test postgres
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As psql processes the commands, you will see the output messages This SQL code creates a new schema called auction, then the four tables in the auction schema (you may need to click the database server name, then click the Refresh button on the top menu bar to see the new items) A sample Login Role to use with the application (called earl) is created, along with a sample Group Role (auctioneer) The auctioneer Group Role is assigned all privileges to all of the tables created, along with privileges to the schema In a real application, you would probably have different levels of access, such as a group to control adding new bidders and donors, another group to update item information, and another group to update the Item table with the winning bids and insert bidder payments to the Payment table
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