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Working with hex numbers in MySQL?
In order to work with hex, use the CONV() function to convert between bases. The syntax is as follows −
SET anyVariableName = CONV(yourHexValue,16,10);
To understand the above syntax, let us create a stored procedure. The query to create a stored procedure is as follows −
mysql> DELIMITER // mysql> CREATE PROCEDURE SP_HEX_TO_DEC( HEXVALUE VARCHAR(10) ) -> BEGIN -> DECLARE Decimalvalue INTEGER; -> SET Decimalvalue = CONV(HEXVALUE,16,10); -> select Decimalvalue; -> END; -> // Query OK, 0 rows affected (0.19 sec) mysql> DELIMITER ;
The above stored procedure converts the hexadecimal to decimal. As we know the A represents 10 in decimal, we will pass A as the parameter. Call the stored procedure using CALL command.
The syntax is as follows −
CALL yourStoredProcedureName;
Call the above stored procedure using CALL command. The query is as follows −
mysql> call SP_HEX_TO_DEC('A');The following is the output displaying the decimal value calculated using the stored procedure created above −
+--------------+ | Decimalvalue | +--------------+ | 10 | +--------------+ 1 row in set (0.00 sec) Query OK, 0 rows affected (0.01 sec)
Check with select statement directly.
mysql> select conv('AB',16,10) as DecimalResult;The following is the output −
+---------------+ | DecimalResult | +---------------+ | 171 | +---------------+ 1 row in set (0.00 sec)
Let us now see the procedure to convert hex to decimal. Remember this rule −
A and B represented as 10 and 11 respectively in hexadecimal. To convert it into decimal rule is as follows: N ………+value3 *162 +value2 *161 + value1 * 160 = 10 * 161 + 11 * 160 = 160+11 = 171.
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