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CHAPTER 5 DEFINING TABLES
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Defining a Table: Using a Template
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SQL Server has a third method of building tables, although this is my least favored method. A large number of templates are built into SQL Server Management Studio for everyday tasks. It is also possible to build your own template for repetitive tasks, which is where I can see more power for developers in this area. Templates can be found in their own explorer window. Selecting View Template Explorer or pressing Ctrl+Alt+T brings up the Template Explorer window, displayed initially on the right-hand side of SQL Server Management Studio.
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Try It Out: Creating a Table Using a Template
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1. Expand the Table node on the Template Explorer. About halfway down you will see a template called Create Table, as shown in Figure 5-13. Double-click this to open up a new Query Editor pane with the template for creating a table.
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Figure 5-13. List of templates
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CHAPTER 5 DEFINING TABLES
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2. Take a close look at the following, which is the listing from the template. A template includes a number of parameters. These are enclosed by angle brackets (<>). -- ========================================= -- Create table template -- ========================================= USE <database, sysname, AdventureWorks> GO IF OBJECT_ID('<schema_name, sysname, dbo>.<table_name, sysname, sample_table>', 'U') IS NOT NULL DROP TABLE <schema_name, sysname, dbo>.<table_name, sysname, sample_table> GO CREATE TABLE <schema_name, sysname, dbo>.<table_name, sysname, sample_table>( <column1_name, sysname, c1> <column1_datatype, , int> <column1_nullability,, NOT NULL>, <column2_name, sysname, c2> <column2_datatype, , char(10)> <column2_nullability,, NULL>, <column3_name, sysname, c3> <column3_datatype, , datetime> <column3_nullability,, NULL>, CONSTRAINT <contraint_name, sysname, PK_sample_table> PRIMARY KEY (<columns_in_primary_key, , c1>) ) GO 3. By pressing Ctrl+Shift+M, you can alter these parameters to make a set of meaningful code. Do this now, so that the parameters can be altered. Figure 5-14 shows most of our third table, TransactionDetails. TransactionTypes. The reason I say most is that our template code only deals with three columns, and our table has four columns. Before choosing to display this screen, you could have altered the code to include the fourth column, or you could modify the base template if you think that three columns are not enough. When you scroll down, you will see a parameter called CONSTRAINT. You can either leave the details as they are or blank them out; it doesn t matter, as we will be removing that code in a moment.
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CHAPTER 5 DEFINING TABLES
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Figure 5-14. Template parameters for TransactionTypes 4. After clicking OK, the code is as follows. The main point of interest is the IF statement after switching to the ApressFinancial database. This code queries SQL Server s system tables to check for a TransactionTypes table within the dbo schema. If it does exist, then the DROP TABLE statement is executed. This statement will delete the table defined from SQL Server, if possible. An error message may be displayed if the table has links with other tables or if someone has a lock on it, thus preventing the deletion. We talk about locks in 8. -- ========================================= -- Create table template -- ========================================= USE ApressFinancial GO IF OBJECT_ID('dbo.TransactionTypes', 'U') IS NOT NULL DROP TABLE dbo.TransactionTypes GO CREATE TABLE dbo.TransactionTypes( TransactionTypeId int NOT NULL, TransactionDescription nvarchar(30) NOT NULL, CreditType bit NOT NULL, CONSTRAINT PRIMARY KEY () ) GO 5. The full code for the TransactionTypes table follows. Once you have entered it, you can execute it. Note that there are three changes here. First of all, we change the schema name from dbo to the correct schema, TransactionDetails, then we put in the IDENTITY details for the TransactionTypeId column, but we are not going to place the fourth column in at this time. We will add it when we take a look at how to alter a table in the section The ALTER TABLE Command later in this chapter. Finally, we remove the CONSTRAINT statement, as we are not creating a key at this time. -- =========================================
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