How to download and setup crystal-mysql
Open terminal and run command
                                            git clone https://github.com/crystal-lang/crystal-mysql.git
                                        
                                        git clone is used to create a copy or clone of crystal-mysql repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with crystal-mysql https://github.com/crystal-lang/crystal-mysql/archive/master.zip
Or simply clone crystal-mysql with SSH
                                            [email protected]:crystal-lang/crystal-mysql.git                                    
                                    If you have some problems with crystal-mysql
You may open issue on crystal-mysql support forum (system) here: https://github.com/crystal-lang/crystal-mysql/issuesSimilar to crystal-mysql repositories
Here you may see crystal-mysql alternatives and analogs
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