Export and Import support user-defined types. Export writes user-defined type definitions, foreign function library definitions, directory alias definitions, and all of the associated data to the dump file. Import then recreates these items from the dump file....
Create a new user-defined data type. Remove a user-defined data type. For more information about creating and removing user-defined data types by using the UserDefinedDatatype object and UserDefinedDatatypes collection, see UserDefinedDatatype Object. When using the Item or Remove method, the Us...
In an application based on the tables defined in the previous section, statements such as the following insert data into the tables: INSERT INTO customer_info VALUES (1, 'Jean Nance', '2 Avocet Drive', 'Redwood Shores', 'CA', '95054', `415-555-1212', NULL, NULL) ; INSERT INTO cust...
A user-defined type (UDT) is a data type that is derived from a supported data type. UDT uses built-in datatypes and other user-defined datatypes as the building blocks for datatypes that model the structure and behavior of data in applications. UDT makes it easier to work with PL/SQL c...
CopyAllUserDefinedDataTypes 属性 Gets or sets a Boolean indicating whether all user-defined data types are transferred from the source to the target database, or only the specified user-defined data types. 命名空间: Microsoft.SqlServer.Dts.Tasks.TransferSqlServerObjectsTask 程序集: Microsoft.SqlServer...
In this tutorial, you have learnt how to: Create user-defined datatypes Create and insert data into object and relational tables Create a project with an Oracle datasource and a DataGridView control Generate .NET custom classes for Oracle user-defined types Modify the ToString() method of the ...
Cassandra - CQL User Defined DatatypesCQL provides the facility of creating and using user-defined data types. You can create a data type to handle multiple fields. This chapter explains how to create, alter, and delete a user-defined data type.Creating a User-defined Data Type...
US7092933 * 2002年12月17日 2006年8月15日 Ncr Corporation Supporting user-defined datatypesUS7092933 Dec 17, 2002 Aug 15, 2006 Ncr Corporation Supporting user-defined datatypesUS7092933 * Dec 17, 2002 Aug 15, 2006 Ncr Corporation Supporting user-defined datatypes...
In Postgres: CREATE TYPE t1 AS ENUM ('foo', 'bar'); -- CREATE TYPE CREATE TYPE t2 AS (a t1, b t1); -- CREATE TYPE SELECT ('foo', 'bar')::t2; -- row -- --- -- (foo,bar) -- (1 row) -- SELECT pg_typeof(('foo', 'bar')::t2); -- pg_typeof -- --- -- ...
DataTypePtrgetReturnTypeImpl(constDataTypes&arguments)constoverride; 在该函数中完成对参数个数和数据类型的检查,同时返回函数返回值对应的 DataType。 booluseDefaultImplementationForConstants()constoverride; 该函数表示如果对于所有参数都为常量的情况下,是否使用系统的默认实现,通常返回true即可。