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Oracle® Database Gateway for Informix User's Guide
11g Release 1 (11.1)

B31047-03
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A Data Type Conversion

This appendix contains the following section:

A.1 Data Type Conversion

The gateway converts Informix data types to Oracle data types as follows:

Table A-1 Data Type Conversions

Informix Oracle Comment

BLOB

LONG RAW

-

BOOLEAN

NUMBER(3)

 

BYTE

LONG RAW

-

CLOB

LONG

-

CHAR

CHAR

-

DATE

DATE

-

DATETIME YEAR TO DAY

DATE

 

DATETIME YEAR TO FRACTION

DATE

 

DATETIME YEAR TO SECOND

DATE

 

DATETIME HOUR TO SECOND

CHAR(15)

 

DATETIME HOUR TO FRACTION

CHAR(15)

 

DECIMAL

NUMBER(p[,s])

-

FLOAT

FLOAT(53)

-

INT8

NUMBER(19)

 

INTEGER

NUMBER(10)

NUMBER range is -2,147,483,647 to 2,147,483,647

INTERVAL YEAR() TO YEAR

INTERVAL YEAR TO MONTH

 

INTERVAL MONTH() TO MONTH

INTERVAL YEAR TO MONTH

 

INTERVAL YEAR() TO MONTH

INTERVAL YEAR TO MONTH

 

INTERVAL DAY() TO DAY

INTERVAL DAY TO SECOND

 

INTERVAL HOUR() TO HOUR

INTERVAL DAY TO SECOND

 

INTERVAL MINUTE() TO MINUTE

INTERVAL DAY TO SECOND

 

INTERVAL SECOND() TO SECOND

INTERVAL DAY TO SECOND

 

INTERVAL SECOND() TO FRACTION

INTERVAL DAY TO SECOND

 

INTERVAL FRACTION TO FRACTION

INTERVAL DAY TO SECOND

 

INTERVAL DAY() TO HOUR

INTERVAL DAY TO SECOND

 

INTERVAL DAY() TO MINUTE

INTERVAL DAY TO SECOND

 

INTERVAL DAY() TO SECOND

INTERVAL DAY TO SECOND

 

INTERVAL DAY() TO FRACTION

INTERVAL DAY TO SECOND

 

INTERVAL HOUR() TO MINUTE

INTERVAL DAY TO SECOND

 

INTERVAL HOUR() TO SECOND

INTERVAL DAY TO SECOND

 

INTERVAL HOUR() TO FRACTION

INTERVAL DAY TO SECOND

 

INTERVAL MINUTE() TO SECOND

INTERVAL DAY TO SECOND

 

INTERVAL MINUTE() TO FRACTION

INTERVAL DAY TO SECOND

 

LVARCHAR

VARCHAR2

-

MONEY

NUMBER(p[,s])

-

NCHAR

CHAR

-

NVARCHAR

VARCHAR2

-

SERIAL

NUMBER(10)

NUMBER range is -2,147,483,647 to 2,147,483,647

SERIAL8

NUMBER(19)

-

SMALLFLOAT

FLOAT(24)

Precision is 6

SMALLINT

NUMBER(5)

 

TEXT

LONG

-

VARCHAR

VARCHAR2

If a length is not specified as part of VARCHAR, the data type is converted to VARCHAR2(1)


In addition to the rules shown in the preceding table, if the maximum size for an Informix data type is smaller or larger than the corresponding Oracle data type, data might be lost. For example, if an Oracle table is defined with a column of VARCHAR2(300) and you use the COPY statement to copy the Oracle table to the Informix table where the Informix column is defined as VARCHAR(255), the data might be truncated.