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A domain can define a default value that the server will use when inserting a new row if the INSERT statement does not include the column in its specification list. Defaults can save time and error during data entry. For example, a possible default for a DATE column could be today s date, or to write the CURRENT_USER context variable into a UserName column. Default values can be A constant. The default value is a user-specified string, numeric value, or date value often used for placing a zero value into a non-nullable column. CURRENT_TIMESTAMP CURRENT_DATE, CURRENT_TIME, or a Firebird , predefined date literal see 10. USER, CURRENT_USER, or CURRENT_ROLE (if roles are applicable). CURRENT_CONNECTION or CURRENT_TRANSACTION.

Although the error handling for this particular function may be a tad beyond the scope of this particular chapter, those who have studied 8 should have no trouble with it. Exception handling aside, what you are doing here is basically reading a file as a binary object. Then, by utilizing the header() function, you can output it as a JPG by merely printing it. You can use this same sort of procedure to read pretty much any file as a binary object and then output it in much the same way, provided you use the proper content type (more widely known as a MIME type). Table 12-2 lists a few of the popular MIME types you may be interested in using as output. Table 12-2. Common File Format Content Types

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nullable columns are initialized as NULL by default anyway. Furthermore, an explicit NULL default can cause conflicts when a column using the domain needs to be defined with a NOT NULL constraint (see The NOT NULL Attribute section later in this chapter).

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The following statement creates a domain that must have a positive value greater than 1,000. If the INSERT statement does not present a VALUE, the column will be assigned the default value of 9,999:

C++ Interop is actually the official name of a feature that is exclusive to Visual C++ While Visual C++ is able to make use of the DllImport attribute to declare and call unmanaged code, just like other managed languages, C++ Interop offers C++ developers an alternative Using C++ Interop can be as simple as writing standard, unmanaged C++ code You include the header file for the function(s) you need to reference, and then, magically, you can make the call, even though you are calling into unmanaged code There are no attributes required, no special function declarations, and no special procedures that you need to follow You do need to include the lib associated with the function(s) in your C++ linker step, but that requirement is no different than unmanaged C++ code To illustrate this, consider this Visual C++ code that calls the AddSomeNumbers unmanaged function: #include "FlatAPILib.

CREATE DOMAIN CUSTNO AS INTEGER DEFAULT 9999 CHECK (VALUE > 1000);

application/pdf application/msword application/excel image/gif image/png application/octet-stream text/plain

If your operating system supports the use of multi-byte characters in user names, or you have used a multi-byte character set when defining roles, then any column into which these defaults will be stored must be defined using a compatible character set.

It is a common mistake to assume that a default value will be used whenever Firebird receives NULL in a defaulted column. When relying on defaults, it must be understood that a default will be applied Only upon insertion of a new row AND Only if the INSERT statement does not include the defaulted column in its column list If your application includes the defaulted column in the INSERT statement and sends NULL in the values list, then NULL will be stored or cause an exception in a non-nullable column regardless of any default defined.

Include this attribute in the domain if you want to force all columns created with this domain to contain a value. NULL which is not a value, but a state will always be disallowed on any column bearing the NOT NULL attribute. For a detailed discussion of NULL, see the topic Considering NULL in 21.

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