mysql: migrate connection flags to enum instead of const, fix example (#7803)

examples/database/mysql.v

@@ -1,15 +1,18 @@
-// import mysql
+import mysql
-
-// fn main() {
-// 	conn := mysql.connect('localhost', 'root', '', 'mysql')
-// 	res := conn.query('show tables')
-// 	for row in res.rows() {
-// 		println(row.vals.join(', '))
-// 	}
-// 	res.free()
-// 	conn.close()
-// }
 
 fn main() {
-	
+	mut conn := mysql.Connection{
+		host: 'localhost'
+		port: 3306
+		username: 'root'
+		password: ''
+		dbname: 'mysql'
+	}
+	conn.connect() ?
+	res := conn.query('show tables') ?
+	for row in res.rows() {
+		println(row.vals.join(', '))
+	}
+	res.free()
+	conn.close()
 }

vlib/mysql/consts.v

@@ -1,23 +1,5 @@
 module mysql
 
-// MYSQL CONNECT FLAGS
-pub const (
-	// CAN_HANDLE_EXPIRED_PASSWORDS       = C.CAN_HANDLE_EXPIRED_PASSWORDS
-	client_compress         = C.CLIENT_COMPRESS
-	client_found_rows       = C.CLIENT_FOUND_ROWS
-	client_ignore_sigpipe   = C.CLIENT_IGNORE_SIGPIPE
-	client_ignore_space     = C.CLIENT_IGNORE_SPACE
-	client_interactive      = C.CLIENT_INTERACTIVE
-	client_local_files      = C.CLIENT_LOCAL_FILES
-	client_multi_results    = C.CLIENT_MULTI_RESULTS
-	client_multi_statements = C.CLIENT_MULTI_STATEMENTS
-	client_no_schema        = C.CLIENT_NO_SCHEMA
-	client_odbc             = C.CLIENT_ODBC
-	// client_optional_resultset_metadata = C.CLIENT_OPTIONAL_RESULTSET_METADATA
-	client_ssl              = C.CLIENT_SSL
-	client_remember_options = C.CLIENT_REMEMBER_OPTIONS
-)
-
 // MYSQL REFRESH FLAGS
 pub const (
 	refresh_grant   = u32(C.REFRESH_GRANT)

vlib/mysql/mysql.v

@@ -1,5 +1,25 @@
 module mysql
 
+
+// Values for the capabilities flag bitmask used by the MySQL protocol.
+// See more on https://dev.mysql.com/doc/dev/mysql-server/latest/group__group__cs__capabilities__flags.html#details
+pub enum ConnectionFlag {
+	// CAN_HANDLE_EXPIRED_PASSWORDS       = C.CAN_HANDLE_EXPIRED_PASSWORDS
+	client_compress         = C.CLIENT_COMPRESS
+	client_found_rows       = C.CLIENT_FOUND_ROWS
+	client_ignore_sigpipe   = C.CLIENT_IGNORE_SIGPIPE
+	client_ignore_space     = C.CLIENT_IGNORE_SPACE
+	client_interactive      = C.CLIENT_INTERACTIVE
+	client_local_files      = C.CLIENT_LOCAL_FILES
+	client_multi_results    = C.CLIENT_MULTI_RESULTS
+	client_multi_statements = C.CLIENT_MULTI_STATEMENTS
+	client_no_schema        = C.CLIENT_NO_SCHEMA
+	client_odbc             = C.CLIENT_ODBC
+	// client_optional_resultset_metadata = C.CLIENT_OPTIONAL_RESULTSET_METADATA
+	client_ssl              = C.CLIENT_SSL
+	client_remember_options = C.CLIENT_REMEMBER_OPTIONS
+}
+
 // TODO: Documentation
 pub struct Connection {
 mut:
@@ -10,7 +30,7 @@ pub mut:
 	username string
 	password string
 	dbname   string
-	flag     int
+	flag     ConnectionFlag
 }
 
 // connect connects to a MySQL server.