mysql: add README.md (#7824)
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For Linux, you need to install `MySQL development` package and `pkg-config`.
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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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## Basic Usage
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```v
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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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