How to perform hexadecimal conversion in oracle

Oracle is a relational database management system that is widely used in the development of enterprise-level applications. In Oracle database, we often need to perform base conversion, such as converting decimal to binary or hexadecimal. This article will introduce the base conversion function and its application in Oracle.

Commonly used bases in Oracle include binary (base 2), octal (base 8), decimal (base 10) and hexadecimal (base 16).

1. Binary conversion functions: TO_BINARY_DOUBLE, TO_BINARY_FLOAT, TO_BLOB, TO_CHAR

TO_BINARY_DOUBLE function represents numbers as IEEE 754 binary double precision floating point format:

SELECT TO_BINARY_DOUBLE(5 ) FROM DUAL;

The output result is: 01000000000101000000000000000000000000000000000000000000000000

TO_BINARY_FLOAT function represents the number as IEEE 754 binary single-precision floating point format:

SELECT TO_ BINARY_FLOAT(5) FROM DUAL;

The output result is: 01000000101000000000000000000000

TO_BLOB function converts a hexadecimal string into binary data:

SELECT TO_BLOB('FFD8FFE000104A46494600010101004800480000') FROM DUAL;

The output result is: ÿØÿàJFIFÿÛC

TO_CHAR function converts binary data to ASCII string:

SELECT TO_CHAR(hextoraw('48454C4C4F'),'UTf8') FROM DUAL;

The output result is: HELLO

2. Octal conversion function: TO_NUMBER

TO_NUMBER function can convert an octal string into a decimal value:

SELECT TO_NUMBER(' 377', 'OOO') FROM DUAL;

The output result is: 255

3. Hexadecimal conversion function: HEXTORAW, RAWTOHEX, UTL_RAW

The HEXTORAW function will Convert hexadecimal string to binary data:

SELECT HEXTORAW('48454C4C4F') FROM DUAL;

The output result is: HELLO

RAWTOHEX function converts binary data It is a hexadecimal string:

SELECT RAWTOHEX('HELLO') FROM DUAL;

The output result is: 48454C4C4F

UTL_RAW contains many binary conversion functions. For example, UTL_RAW.CAST_TO_RAW can convert a string into binary data, and UTL_RAW.CAST_TO_VARCHAR2 can convert binary data into a string.

4. Decimal conversion function: TO_CHAR, TO_NUMBER

TO_CHAR function can convert numbers into strings:

SELECT TO_CHAR(123) FROM DUAL;

The output result is: 123

TO_NUMBER function can convert a string into a number:

SELECT TO_NUMBER('123') FROM DUAL;

The output result is: 123

Summary:

Oracle provides a wealth of base conversion functions that can easily convert between different bases. In practical applications, we can use these functions for data processing and analysis to improve data processing efficiency, thereby making the application more efficient and stable.

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