sql writer

pkg/writers/pgsql/templates/create_primary_key.tmpl

@@ -0,0 +1,13 @@
+DO $$
+BEGIN
+  IF NOT EXISTS (
+    SELECT 1 FROM information_schema.table_constraints
+    WHERE table_schema = '{{.SchemaName}}'
+      AND table_name = '{{.TableName}}'
+      AND constraint_name = '{{.ConstraintName}}'
+  ) THEN
+    ALTER TABLE {{.SchemaName}}.{{.TableName}}
+      ADD CONSTRAINT {{.ConstraintName}} PRIMARY KEY ({{.Columns}});
+  END IF;
+END;
+$$;