Crystal Reports 9 on Oracle by Marie Annette Harper

By Marie Annette Harper

Discover connectivity innovations, then delve into optimization tools that may be carried out within the Crystal atmosphere, together with using SQL Expressions and SQL instructions. insurance contains an execution plan, optimization of indexes, and relief of parsing, and Oracle-specific positive aspects akin to exterior tables, Heterogeneous Connectivity, and Oracle Flashback. universal problems whilst utilizing Oracle are defined, and options supplied.

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It is always safer to use the TO_DATE Oracle function with a specific format string instead of date literals. DateTime Functions Crystal Reports contains many date functions that can be used in formulas, but none of the Crystal Report date functions is translated to equivalent Oracle date functions in the SQL Query. If numerous or complex date manipulations are required, this could cause a slowdown in processing. To move this processing to the server, use SQL Expressions containing Oracle date functions.

Phone_Rec. This table can be reported on from Crystal Reports. It is a table of a simple object type and Oracle will automatically translate the fields in the object type into regular table fields for querying. The second object table is the Contact_Object_Table. It is defined by a more complex object type where one type is nested inside another. In this case, Crystal can directly access fields from the parent object type but not from the nested object type. Collections There are two types of collection objects in Oracle, varrays and nested tables.

Nested Tables Nested tables can be treated the same as varrays for reporting purposes. You must use the TABLE command to unnest the table. Note Varrays and nested tables can be multidimensional in Oracle 9i. For example, you can create a varray of a varray type. Nulls The Oracle null value is an important concept for report writers to understand. A null indicates the lack of a value. Any column of any datatype may contain nulls if the NOT NULL constraint has not been implemented for that column.

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