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Early Catalyst practices resulted in a substantial amount of business logic being contained in the controller classes For simple applications, this design works perfectly well However, as the business logic gets more complex, the controller s dual responsibility of UI state maintenance as well as business logic leads to tangled code where functionality is difficult to factor out Applications of this style are often referred to within the Catalyst community as fat controller (see Figure 1-1) and tend to be frowned upon due to the known maintenance issues Keeping the business logic in the controller ties it to the HTTP architecture and makes it difficult to reuse code for command-line utilities, cron scripts, and other non-web clients In addition, it is also difficult to test the business logic in isolation, forcing integration tests to attempt to cover functionality that should already be verified by unit testing.

You must give every field in Concordance a data type. The data type of a field governs what type of data is allowed in the field. For example, the field DOCDATE, which contains the date a document was created, cannot contain nonnumeric characters. Data typing fields aids you in ensuring that the data contained in a database is accurate. The following data types are available for fields in a Concordance database: TEXT: Appropriate for alphanumeric values that don t exceed 60 characters in length. NUMERIC: Appropriate for number values. The length attribute governs how many characters are allowed for the number. A length of 4 allows values from 0000 to 9999 to be entered in the field. The places attribute sets the position of a decimal place. For a numeric field with a length of 4 and a position of 2, the allowed values are 00.00 to 99.99. The format attribute governs how the numeric values appear to users, and can be one of the following settings: Plain, Comma, Currency, and Zero filled. The Plain setting is the default format attribute for a NUMERIC field.

get buffer.sql nolist @sqlplus_settings set termout on Many SQL*Plus tricks in this script are similar to the ones used in the script for the previous exercise. Here are some additional comments on this solution: The BREAK command enhances the readability. You use the same default value trick for the table name. You need the period character in the ACCEPT command as a separator between the TABLE_NAME variable and the percent sign.

4. Create a script that disables all constraints in your schema. Answer: First, you must find out which SQL statement allows you to disable constraints, because your script is going to generate that statement. The following SQL command is the most obvious choice: SQL> ALTER TABLE <table-name> DISABLE CONSTRAINT <constraint-name> [CASCADE] As the next step, you must figure out how to retrieve relevant information about your constraints. The SQL*Plus DESCRIBE command is useful: SQL> describe user_constraints Name --------------------------------OWNER CONSTRAINT_NAME CONSTRAINT_TYPE TABLE_NAME SEARCH_CONDITION R_OWNER R_CONSTRAINT_NAME DELETE_RULE STATUS DEFERRABLE DEFERRED VALIDATED GENERATED BAD RELY LAST_CHANGE INDEX_OWNER INDEX_NAME INVALID VIEW_RELATED SQL> Type -----------VARCHAR2(30) VARCHAR2(30) VARCHAR2(1) NOT NULL VARCHAR2(30) LONG VARCHAR2(30) VARCHAR2(30) VARCHAR2(9) VARCHAR2(8) VARCHAR2(14) VARCHAR2(9) VARCHAR2(13) VARCHAR2(14) VARCHAR2(3) VARCHAR2(4) DATE VARCHAR2(30) VARCHAR2(30) VARCHAR2(7) VARCHAR2(14) Null -------NOT NULL NOT NULL

DATE MMDDYYYY, DATE YYYYMMDD, DATE DDMMYYYY: Appropriate for dates. The three options conform to the formats of the dates when viewed by users, where MMDDYYYY means two digits that represent a month, two digits that represent a day, and four digits that represent a year. Dates in external delimited load files are allowed to have separating hyphens or slashes. Given the format MMDDYYYY, the dates 09/01/2005 and 09012005 are both valid values. PARAGRAPH: Appropriate for text values that exceed 60 characters. This is the data type for fields that contain the full text of documents. The length attribute, available for the TEXT data type, cannot be set for PARAGRAPH fields. The most common method of searching for values in a PARAGRAPH field is to use Concordance s free-form search syntax. However, you can apply relational operators such as <, >, and = to PARAGRAPH fields. When Concordance sorts values in a PARAGRAPH field, it only uses the first 60 characters of the field to accomplish the sort.