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It is often desirable to track the user, date, and time associated with changes to the rows in a database. The following demonstration from WhoWhenDefaults.sql tracks who made the last change to a row and when the user either inserted or modified the row. The DEFAULT property used along with the USER and CURRENT_TIMESTAMP SQL-92 niladic functions can help you store this kind of information in a table. The demonstration also contrasts the datetime return value from the CURRENT_TIMESTAMP function with a timestamp data type value. Recall that the timestamp data type adds a binary(8) number to a row rather than datetime data type.
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CHAPTER 4 DATA TYPES, TABLES, AND CONSTRAINTS
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The following excerpt from WhoWhenDefaults.sql creates a table with five columns. The first two columns have int and bit data types along with constraints, borrowed from the preceding sample, for the bit1 column. The declaration for the third column shows how to assign a name (rvr1) to a timestamp column. With the current declaration syntax, you can replace timestamp with rowversion. The designation of a name for a timestamp column is optional. If you do not explicitly specify a name, SSE uses the default name of timestamp for the column. Unlike the timestamp data type, the rowversion data type requires a column name in its declaration. The fourth column s declaration assigns the return value from the USER function to the usr1 column. The USER function returns the name of the current user, which is a user account. SQL Server Express represents user account names with a sysname data type that you can store in a column with an nvarchar(128) data type. The last column s declaration stores the date and time for a change in a datetime format. The CURRENT_TIMESTAMP function returns this value. CREATE TABLE T ( int1 int, bit1 bit NOT NULL DEFAULT 0, rvr1 timestamp, usr1 nvarchar(128) DEFAULT USER, createtime datetime DEFAULT CURRENT_TIMESTAMP ) The following excerpt from WhoWhenDefaults.sql inserts three rows into the T table at 1-second intervals. The two WAITFOR statements generate 1-second delays between the INSERT statements. Without the delays, it is possible for SSE to insert more than one row within a single datetime instance. You will not normally program delays when inserting rows, but using them in this context helps to clarify the values returned by the CURRENT_TIMESTAMP function. INSERT T (int1) VALUES (1) WAITFOR DELAY '00:00:01' INSERT T (int1, bit1) VALUES (2, 0) WAITFOR DELAY '00:00:01' INSERT T (int1, bit1) VALUES (3, 1) The last code excerpt from WhoWhenDefaults.sql in the following code listing starts by listing the values in T generated by the preceding INSERT statements with a SELECT statement. The fourth item in the SELECT list uses a CONVERT function to represent the binary(8) value generated by the timestamp data type as an integer. Next, an UPDATE statement revises the bit1 column value to 1 for the row with an int1 column value of 2 (this is the second row). This bit1 column value is set to 0 by the preceding codeblock. The concluding SELECT statement lists the T values after the revision of the bit1 column value. SELECT int1, bit1, usr1, CONVERT(int, rvr1) 'Timestamp as int', createtime FROM T GO UPDATE T set bit1 = 1 WHERE int1 = 2 GO
CHAPTER 4 DATA TYPES, TABLES, AND CONSTRAINTS
SELECT int1, bit1, usr1, CONVERT(int, rvr1) 'Timestamp as int', createtime FROM T GO An excerpt from the result listing for running the script in WhoWhenDefaults.sql appears next. SQL Server Express generates the first result set from the first SELECT statement immediately after the INSERT statements. Notice that the timestamp values increase by a single integer value from one row to the next. The actual values start at 3104 and end at 3106. In contrast, the createtime column, which results from the CURRENT_TIMESTAMP function, increases by about 1 second for each successive row. The usr1 column values reflect the return value from the USER function. I ran the script as the dbo user. SQL Server Express generates the second result set after invoking the UPDATE statement, which changes the bit1 column value for the row with an int1 value of 2. Notice that this second result set has a new value for the timestamp column as well as the bit1 column in the second row. The new timestamp column value is 3107. Also, notice that the createtime column value does not change. This distinction between the timestamp and createtime columns results from the fact that the CURRENT_TIMESTAMP function in the CREATE TABLE statement only operates when SQL Server Express inserts a new row in the table, but the timestamp column receives a new value whenever a row is initially inserted as well as for each subsequent row update. int1 ----1 2 3 int1 ----1 2 3 bit1 ----0 0 1 bit1 ----0 1 1 usr1 ----dbo dbo dbo usr1 ----dbo dbo dbo Timestamp as int ---------------3104 3105 3106 Timestamp as int ---------------3104 3107 3106 createtime ----------------------2005-04-02 18:57:03.227 2005-04-02 18:57:04.230 2005-04-02 18:57:05.290 createtime ----------------------2005-04-02 18:57:03.227 2005-04-02 18:57:04.230 2005-04-02 18:57:05.290
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