java pdf generation framework

java pdf generation framework

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However, you have to carefully choose the concepts on which integrity will be based Preferably, those concepts and their nature should be few in number and agreed upon Let me explain concepts for data integrity with an example Imagine that you have a domain called spouse You define a constraint for using this domain in a relation: a person can have one spouse only By defining such a constraint, you have already made a mistake, because some cultures and religions don t limit this association to a one-to-one relationship! Still, you can include many constraints for a domain The set of operators defined on a domain already constrain what you can do with values from that domain Whenever you try to manipulate the data, the system could check that the operands are of the correct types for the operation .

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To get only two levels of subordinates under employee 3, run the following code, which generates the

For example, the system could allow a multiplication operation between the attributes.

Note the use of the expression (SELECT 0) in the ORDER BY clause of the ROW_NUMBER function indicating that the order of assignment of row numbers doesn t matter. If order matters, specify the appropriate attributes that you need for example, orderdate in case you want the row numbers to be assigned based on order date ordering. When you re done experimenting with this code, don t forget to drop the MyOrders table:

DROP TABLE dbo.MyOrders;

The following code adds a DEFAULT constraint to keycol, which invokes the T1_getkey function:

output shown in Table 9-12: SELECT empid, lvl FROM dbo.fn_subordinates2(3, 2) AS S;

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Another application of cross joins allows you to improve performance of queries that apply calculations between row attributes and aggregates over rows. To demonstrate this fundamental technique, I ll use a table called MyOrderValues that you create and populate by running the following code in the InsideTSQL2008 database:

ALTER TABLE dbo.T1 ADD DEFAULT(dbo.T1_getkey()) FOR keycol;

IF OBJECT_ID('dbo.MyOrderValues', 'U') IS NOT NULL GO SELECT * INTO dbo.MyOrderValues FROM Sales.OrderValues; ALTER TABLE dbo.MyOrderValues ADD CONSTRAINT PK_MyOrderValues PRIMARY KEY(orderid); CREATE INDEX idx_val ON dbo.MyOrderValues(val); DROP TABLE dbo.MyOrderValues;

To get only the second level employees under employee 3, add a filter on the level, which will generate the output shown in Table 9-13: SELECT empid FROM dbo.fn_subordinates2(3, 2) AS S WHERE lvl = 2;

multiple-row inserts . Also, reusing key values is almost never advisable in actual business scenarios . I m using this example here for demonstration purposes only .

The task at hand is to calculate for each order that order s percentage of total value and the difference between the order value and the average value for all orders. The intuitive way for programmers to write calculations between row attributes and aggregates over rows is to use subqueries. The query in Listing 7-1 demonstrates the subquery approach.

SELECT orderid, custid, val, CAST(val / (SELECT SUM(val) FROM dbo.MyOrderValues) * 100. AS NUMERIC(5, 2)) AS pct, CAST(val - (SELECT AVG(val) FROM dbo.MyOrderValues) AS NUMERIC(12, 2)) AS diff FROM dbo.MyOrderValues;

The following code inserts three rows, generating the keys 1, 2, and 3; deletes the row with the key 2; and inserts another row, generating the key 2:

To limit levels using a CTE, you might be tempted to use the hint called MAXRECURSION, which raises an error and aborts when the number of invocations of the recursive member exceeds the input. However, MAXRECURSION was designed as a safety measure to avoid infinite recursion in cases of problems in the data or bugs in the code. When not specified, MAXRECURSION defaults to 100. You can specify MAXRECURSION 0 to have no limit, but be aware of the implications. To test this approach, run the code in Listing 9-9, which generates the output shown in Table 9-14. It's the same subtree CTE shown earlier, with the addition of the MAXRECURSION hint, limiting recursive invocations to 2.

This query generates the following output:

INSERT INSERT INSERT DELETE INSERT INTO INTO INTO FROM INTO dbo.T1(datacol) VALUES('a'); dbo.T1(datacol) VALUES('b'); dbo.T1(datacol) VALUES('c'); dbo.T1 WHERE keycol = 2; dbo.T1(datacol) VALUES('d');

orderid ----------10248 10249 10250 10251 custid ----------85 79 34 84 val ---------440.00 1863.40 1552.60 654.06 pct --------0.03 0.15 0.12 0.05 diff -------------1085.05 338.35 27.55 -870.99

DECLARE @root AS INT; SET @root = 3; WITH SubsCTE AS ( SELECT empid, empname, 0 AS lvl FROM dbo.Employees WHERE empid = @root UNION ALL SELECT C.empid, C.empname, P.lvl + 1 FROM SubsCTE AS P JOIN dbo.Employees AS C ON C.mgrid = P.empid ) SELECT * FROM SubsCTE OPTION (MAXRECURSION 2);

Query the table by using the following code:

10252 10253 10254 10255 10256 10257 ... 76 34 14 68 88 35 3597.90 1444.80 556.62 2490.50 517.80 1119.90 0.28 0.11 0.04 0.20 0.04 0.09 2072.85 -80.25 -968.43 965.45 -1007.25 -405.15

(830 row(s) affected)

SELECT * FROM dbo.T1;

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