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vlib: move the mysql/sqlite/pg/mssql modules under vlib/db (#16820)
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For Linux, you need to install `MySQL development` package and `pkg-config`.
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## Description:
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For Windows, install [the installer](https://dev.mysql.com/downloads/installer/) ,
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then copy the `include` and `lib` folders to `<V install directory>\thirdparty\mysql`.
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Note: if you encounter weird errors (your program just exits right away, without
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printing any messages, even though you have `println('hi')` statements in your
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`fn main()`), when trying to run a program that does `import mysql` on windows, you
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may need to copy the .dll file: `thirdparty/mysql/lib/libmysql.dll` , into the folder
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of the executable too (it should be right next to the .exe file).
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This is a temporary workaround, until we have a more permanent solution, or at least
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more user friendly errors for that situation.
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## Basic Usage
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```v oksyntax
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import mysql
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// Create connection
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mut connection := mysql.Connection{
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username: 'root'
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dbname: 'mysql'
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}
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// Connect to server
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connection.connect()?
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// Change the default database
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connection.select_db('db_users')?
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// Do a query
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get_users_query_result := connection.query('SELECT * FROM users')?
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// Get the result as maps
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for user in get_users_query_result.maps() {
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// Access the name of user
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println(user['name'])
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}
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// Free the query result
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get_users_query_result.free()
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// Close the connection if needed
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connection.close()
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```
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The `mysql` module has been moved to `db.mysql`.
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Update your code to do: `import db.mysql` instead.
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