Oracle C++ Call Interface Programmer's Guide

External Datatypes
■ OCCI_SQLT_CHR (VARCHAR2)
■ OCCI_SQLT_VCS (VARCHAR)
■ OCCI_SQLT_STR (null terminated string)
■ OCCI_SQLT_LVC (long VARCHAR)
■ OCCI_SQLT_AFC (CHAR)
■ OCCI_SQLT_AVC (CHARZ)
■ OCCI_SQLT_VST (string)
■ OCCI_SQLT_RDD (ROWID descriptor)
External Datatypes
Communication between the host OCCI application and the Oracle database server
is through the use of external datatypes. Specifically, external datatypes are mapped
to C++ datatypes.
Table 4–2 lists the Oracle external datatypes, the C++ equivalent (what the Oracle
internal datatype is usually converted to), and the corresponding OCCI type:
Table 4–2 External Datatypes, C++ Datatypes, and OCCI Types
External Datatype Code C++ Datatype OCCI Type
Binary FILE 114 LNOCILobLocator OCCI_SQLT_FILE
Binary LOB 113 LNOCILobLocator OCCI_SQLT_BLOB
CHAR 96 char[n] OCCI_SQLT_AFC
Character LOB 112 LNOCILobLocator OCCI_SQLT_CLOB
CHARZ 97 char[n+1] OCCI_SQLT_RDD
DATE 12 char[7] OCCI_SQLT_DAT
FLOAT 4 float, double OCCIFLOAT
16 bit signed INTEGER 3 signed short, signed int OCCIINT
32 bit signed INTEGER 3 signed int, signed long OCCIINT
8 bit signed INTEGER 3 signed char OCCIINT
INTERVAL DAY TO SECOND 190 char[11] OCCI_SQLT_INTERVAL_DS
n Indicates variable length, depending on program requirements (or the operating system in the case of ROWID).
Datatypes 4-5