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Adding claims to a-Order is really just a con guration step. The application code needs no change. If you download the project from http://claimsid.codeplex.com, you can compare the Web.con g les before and after conversion to claims. It was just a matter of right-clicking the project in Visual Studio and then clicking Add STS Reference. The process is very similar to what you saw in the previous sections for the a-Expense application. The claims types required are still the users and roles that were previously provided by Windows authentication.

Obviously, the function arguments come with some constraints. For example, the datatype of the function arguments must make some logical sense. The Oracle DBMS always tries to perform implicit datatype conversion, and it will generate an error message only if such an attempt fails. In other words, if you specify a number as an argument for a function that expects a string instead, the number will be interpreted alphanumerically. However, if you ask for the square root of an employee name, you will get the error message ORA-01722: invalid number.

Caution It is not a good idea to rely on implicit datatype conversion in your SQL statements. You should always use explicit conversion functions instead. This improves SQL readability, robustness, and possibly performance.

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A good chart will have a clear title, a legend, and labels. You can specify these elements by selecting your chart and then clicking Chart Chart Options. Available options will vary, depending on the type of chart. On the Titles tab, shown in Figure 2-40, you can specify a title for the entire chart and titles for the axes. Changes appear immediately in the preview section.

As stated previously, Oracle supports many functions. You can categorize them based on the datatype they expect in their arguments, as shown in Table 5-1. Table 5-1. Function Types

Arithmetic functions Text functions Regular expression functions Date functions General functions Conversion functions Group functions

<claimTypeRequired> <claimType type= "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/name" /> <claimType type= "http://schemas.microsoft.com/ws/2008/06/identity/claims/role" /> </claimTypeRequired>

Numerical data Alphanumeric data Alphanumeric data Date/time-related data Any datatype Datatype conversion Sets of values

The last category in Table 5-1, group functions, is covered in 8, where we discuss the group BY and having clauses of the SELECT command, since that chapter is a more natural place to introduce them. The other function types are discussed in the following sections.

On the Axes tab, you can change the labels that appear along each axis (see Figure 2-41). This can prove handy if space is limited. However, be careful not to sacrifice the chart s clarity.

The most popular arithmetic functions of Oracle are listed in Table 5-2. Table 5-2. Common Oracle Arithmetic Functions

Look at the implementation of the ClaimHelper class in the sample code for an example of how to retrieve claims about the current user.

ROUND(n[,m]) TRUNC(n[,m]) CEIL(n) FLOOR(n) ABS(n) SIGN(n) SQRT(n) EXP(n) LN(n),LOG(m,n) POWER(n,m) MOD(n,m) SIN(n), COS(n), TAN(n) ASIN(n), ACOS(n), ATAN(n) SINH(n), COSH(n), TANH(n)

Round n on m decimal positions Truncate n on m decimal positions Round n upwards to an integer Round n downwards to an integer Absolute value of n 1, 0, or 1 if n is negative, zero, or positive Square root of n e ( = 2,7182813 ) raised to the nth power Natural logarithm, and logarithm base m n raised to the mth power Remainder of n divided by m Sine, cosine, and tangent of n (n expressed in radians) Arcsine, arccosine, and arctangent of n Hyperbolic sine, hyperbolic cosine, and hyperbolic tangent of n

As Table 5-2 shows, the ROUND and TRUNC functions have an optional argument m; the default value for m is zero. Note that you can also use negative values for m, as you can see from the second example in Listing 5-1. Listings 5-1 through 5-4 show some self-explanatory examples of using the following arithmetic functions: ROUND, CEIL, FLOOR, ABS, SIGN, POWER, and MOD.

On the Gridlines tab, shown in Figure 2-42, you can specify what gridlines you want to add to the chart, which can make it easier to read a chart.

Listing 5-1. Using the ROUND, CEIL, and FLOOR Functions select round(345.678, 0), ceil(345.678), floor(345.678) from dual; ROUND(345.678) CEIL(345.678) FLOOR(345.678) -------------- ------------- -------------346 346 345 select , , from round(345.678, 2) round(345.678,-1) round(345.678,-2) dual;

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