Cache 'SHOW FULL TABLES' (#25)

Co-authored-by: Nick Schuch <[email protected]>

internal/mysql/mysql.go

@@ -49,6 +49,8 @@ func (o Connection) Open(database string) (*sql.DB, error) {
 type Client struct {
 	DB     *sql.DB
 	Logger *log.Logger
+	// A field for caching a list of tables for this database.
+	cachedTables []string
 }
 
 // NewClient for dumping a full or single table from a database.

internal/mysql/tables.go

@@ -34,6 +34,11 @@ func (d *Client) ListTablesByGlob(globs []string) ([]string, error) {
 
 // QueryTables will return a list of tables.
 func (d *Client) QueryTables() ([]string, error) {
+	// Use the cached tables if we have them.
+	if len(d.cachedTables) > 0 {
+		return d.cachedTables, nil
+	}
+
 	tables := make([]string, 0)
 
 	rows, err := d.DB.Query("SHOW FULL TABLES")
@@ -56,6 +61,9 @@ func (d *Client) QueryTables() ([]string, error) {
 		}
 	}
 
+	// Set the cached tables for future executions.
+	d.cachedTables = tables
+
 	return tables, nil
 }