fix: handling named parameter in string literals

[hirasawayuki]

fix

• Improve handling of named parameters in namedSelect and namedExec methods #19

description

This PR introduces improvements to the handling of colons within string literals in SQL query parsing and ensures backward compatibility with existing codebases and database queries. It addresses issues where colons inside string literals were incorrectly interpreted as named parameters, leading to query parsing errors.

changes

• Implemented logic to detect the start and end of string literals, ensuring colons within these literals are correctly identified and not treated as part of named parameters.
• Added an escaping mechanism for colons that appear as part of string literals, allowing for explicit differentiation between literal colons and named parameter indicators.
• Ensured that the new parsing logic retains backward (this case)compatibility by accurately processing existing queries with colons in string literals, including those with escaped colons.

[uvulpos]

maybe we have to rename variables of the function in the future since this was not a easy read to me, but for now the implementation looks good for me. Good Job 👍🏻

[uvulpos]

thank you for your contribution 😎👍🏻