If you insert a value that is shorter than the column length, then Oracle pads the value with blanks to whichever length is smaller: maximum character length or maximum byte length. You can define an NCHAR variable of up to 32767 characters, but the actual data cannot exceed 32767 bytes. In PL/SQL, the maximum length of NCHAR data is 32767 bytes. The two size constraints must be satisfied at the same time. The actual data is subject to the maximum byte limit of 2000. The maximum column size allowed is 2000 characters when the national character set is UTF when it is AL16UTF16. The national character set can be either UTF8 or AL16UTF16. The national character set, which is used for all NCHAR datatypes, is defined when the database is created. Maximum number of bytes = (maximum number of characters) x (maximum number of bytes for each character)įor example, if the national character set is UTF8, then the maximum byte length is 30 characters times 3 bytes for each character, or 90 bytes. The maximum number of bytes for the column is determined as follows: For example, the following statement creates a column with a maximum length of 30 characters: When you define a table column or a PL/SQL variable as the NCHAR datatype, the length is always specified as the number of characters. The following sections describe how each of the database access products supports Unicode data access to an Oracle database and offer examples for using those products: They allow PL/SQL programs to declare CHAR, VARCHAR2, NCHAR, and NVARCHAR2 variables and to access SQL CHAR and NCHAR datatypes in the database. The PL/SQL and SQL engines process PL/SQL programs and SQL statements on behalf of client-side programs such as OCI and server-side PL/SQL stored procedures. Unicode turkish characters drivers#The JDBC server-side internal driver that is used inside the Oracle server to access the data in the databaseĪll drivers support Unicode data access to SQL CHAR and NCHAR datatypes in the database. The JDBC server-side thin driver, a pure Java driver used inside Java stored procedures to connect to another Oracle server The JDBC thin driver, which is a pure Java driver that is primarily used by Java applets and supports the Oracle Net protocol over TCP/IP The JDBC OCI driver that is used by Java applications and requires the OCI library Oracle provides the following JDBC drivers: Oracle JDBC drivers are the primary Java programmatic interface for accessing an Oracle database. It provides UTF-16 data access through Unicode datatypes. Unicode turkish characters windows#NET programming environment on Windows platforms to access Unicode data stored in SQL CHAR and NCHAR datatypes. It provides UTF-16 data access through wide string OLE DB datatypes. The Oracle Provider for OLE DB enables C/C++, Visual Basic, and VBScript programs running on Windows platforms to access Unicode data stored in SQL CHAR and NCHAR datatypes. It provides UTF-16 data access by implementing the SQLWCHAR interface specified in the ODBC standard specification. The Oracle ODBC driver enables C/C++, Visual Basic, and VBScript programs running on Windows platforms to access Unicode data stored in SQL CHAR and NCHAR datatypes of the database. It uses OCI's Unicode capabilities to provide UTF-16 and UTF-8 data access for SQL CHAR and NCHAR datatypes. Oracle Pro*C/C++ enables you to embed SQL and PL/SQL in your programs. It accesses the database through Oracle Net. Using OCI, you can programmatically specify the character set (UTF-8, UTF-16, and others) for the data to be inserted or retrieved. It provides a flexible way for C/C++ programs to access Unicode data stored in SQL CHAR and NCHAR datatypes. The Oracle Call Interface (OCI) is the lowest level API that the rest of the client-side database access products use. Figure 7-1 Oracle Database Access Productsĭescription of "Figure 7-1 Oracle Database Access Products "
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |