refactor sql_generation/model/query

parser/src/ast.rs

@@ -982,6 +982,41 @@ impl std::fmt::Display for QualifiedName {
     }
 }
 
+impl QualifiedName {
+    /// Constructor
+    pub fn single(name: Name) -> Self {
+        Self {
+            db_name: None,
+            name,
+            alias: None,
+        }
+    }
+    /// Constructor
+    pub fn fullname(db_name: Name, name: Name) -> Self {
+        Self {
+            db_name: Some(db_name),
+            name,
+            alias: None,
+        }
+    }
+    /// Constructor
+    pub fn xfullname(db_name: Name, name: Name, alias: Name) -> Self {
+        Self {
+            db_name: Some(db_name),
+            name,
+            alias: Some(alias),
+        }
+    }
+    /// Constructor
+    pub fn alias(name: Name, alias: Name) -> Self {
+        Self {
+            db_name: None,
+            name,
+            alias: Some(alias),
+        }
+    }
+}
+
 /// `ALTER TABLE` body
 // https://sqlite.org/lang_altertable.html
 #[derive(Clone, Debug, PartialEq, Eq)]