How to do this conversion in Oracle

Oracle is a powerful relational database management system that supports multiple data types, including binary types. In Oracle, it is often necessary to convert binary data into hexadecimal numbers. This article will describe how to perform this conversion in Oracle.

1. Use the TO\_RAW function to convert binary data to hexadecimal

In Oracle, you can use the TO\_RAW function to convert binary data to RAW type, and then use the RAWTOHEX function to convert the RAW type Convert to hexadecimal string. For example, the following SQL statement will convert binary data to hexadecimal:

SELECT RAWTOHEX(TO_RAW('Hello, World!')) as HEX_VALUE FROM DUAL;

After executing the above SQL statement, you will get the following result:

48454C4C4F2C20576F726C6421

This result is "Hello, World!" converted to hexadecimal value.

2. Use the UTL\_RAW package to convert binary data to hexadecimal

In addition to using the TO\_RAW and RAWTOHEX functions, Oracle also provides the UTL\_RAW package, which is more convenient Perform binary data conversion to hexadecimal.

Three functions are provided in the UTL\_RAW package:

1. CAST\_TO\_RAW: Convert a string to RAW type.
2. CAST\_FROM\_RAW: Convert RAW type to string.
3. HEX\_TO\_RAW: Convert hexadecimal string to RAW type.

For example, the following SQL statement uses the UTL\_RAW package to convert binary data to hexadecimal:

SELECT UTL_RAW.CAST_TO_RAW('Hello, World!') as RAW_VALUE, UTL_RAW.CAST_TO_RAW('Hello, World!') as HEX_VALUE from DUAL;

After executing the above SQL statement, you will get the following results:

48454C4C4F2C20576F726C6421,0x48454C4C4F2C20576F726C6421

Among them, the RAW\_VALUE column shows the result after converting "Hello, World!" to the RAW type; the HEX\_VALUE column shows the result after converting the RAW type into a hexadecimal string. result.

It should be noted that when using the UTL\_RAW package to perform hexadecimal conversion, the input data must be a hexadecimal string with an even number of digits. For example, the following SQL statement will throw an exception:

SELECT UTL_RAW.HEX_TO_RAW('48454C4C4F2C20576F726C642') from DUAL;

Because "48454C4C4F2C20576F726C642" is a hexadecimal string with odd digits. The correct way to write it should be:

SELECT UTL_RAW.HEX_TO_RAW('48454C4C4F2C20576F726C6421') from DUAL;

3. Summary

There are many methods to choose from to convert binary data to hexadecimal in Oracle. You can use the TO\_RAW and RAWTOHEX functions. You can also use the related functions of the UTL\_RAW package. Either way, this conversion can be accomplished conveniently.

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