Fix exporting into Postgres, problems: (#1186)

* UUID and BOOL type shouldn't have a length field
 * Incorrect quoting cause that the column names are selected instead of the column values

Author: gzsombor

dialect_postgres.go

@@ -822,7 +822,7 @@ func (db *postgres) SqlType(c *core.Column) string {
 	case core.NVarchar:
 		res = core.Varchar
 	case core.Uuid:
-		res = core.Uuid
+		return core.Uuid
 	case core.Blob, core.TinyBlob, core.MediumBlob, core.LongBlob:
 		return core.Bytea
 	case core.Double:
@@ -834,6 +834,10 @@ func (db *postgres) SqlType(c *core.Column) string {
 		res = t
 	}
 
+	if strings.EqualFold(res, "bool") {
+		// for bool, we don't need length information
+		return res
+	}
 	hasLen1 := (c.Length > 0)
 	hasLen2 := (c.Length2 > 0)
 

engine.go

@@ -481,7 +481,8 @@ func (engine *Engine) dumpTables(tables []*core.Table, w io.Writer, tp ...core.D
 		}
 
 		cols := table.ColumnsSeq()
-		colNames := dialect.Quote(strings.Join(cols, dialect.Quote(", ")))
+		colNames := engine.dialect.Quote(strings.Join(cols, engine.dialect.Quote(", ")))
+		destColNames := dialect.Quote(strings.Join(cols, dialect.Quote(", ")))
 
 		rows, err := engine.DB().Query("SELECT " + colNames + " FROM " + engine.Quote(table.Name))
 		if err != nil {
@@ -496,7 +497,7 @@ func (engine *Engine) dumpTables(tables []*core.Table, w io.Writer, tp ...core.D
 				return err
 			}
 
-			_, err = io.WriteString(w, "INSERT INTO "+dialect.Quote(table.Name)+" ("+colNames+") VALUES (")
+			_, err = io.WriteString(w, "INSERT INTO "+dialect.Quote(table.Name)+" ("+destColNames+") VALUES (")
 			if err != nil {
 				return err
 			}