add joins to delete builder

delete.go

@@ -19,6 +19,7 @@ type deleteData struct {
 	Limit             string
 	Offset            string
 	Suffixes          []Sqlizer
+	Joins             []Sqlizer
 }
 
 func (d *deleteData) Exec() (sql.Result, error) {
@@ -48,6 +49,14 @@ func (d *deleteData) ToSql() (sqlStr string, args []interface{}, err error) {
 	sql.WriteString("DELETE FROM ")
 	sql.WriteString(d.From)
 
+	if len(d.Joins) > 0 {
+		sql.WriteString(" ")
+		args, err = appendToSql(d.Joins, sql, " ", args)
+		if err != nil {
+			return
+		}
+	}
+
 	if len(d.WhereParts) > 0 {
 		sql.WriteString(" WHERE ")
 		args, err = appendToSql(d.WhereParts, sql, " AND ", args)
@@ -189,3 +198,33 @@ func (d *deleteData) Query() (*sql.Rows, error) {
 	}
 	return QueryWith(d.RunWith, d)
 }
+
+// JoinClause adds a join clause to the query.
+func (b DeleteBuilder) JoinClause(pred interface{}, args ...interface{}) DeleteBuilder {
+	return builder.Append(b, "Joins", newPart(pred, args...)).(DeleteBuilder)
+}
+
+// Join adds a JOIN clause to the query.
+func (b DeleteBuilder) Join(join string, rest ...interface{}) DeleteBuilder {
+	return b.JoinClause("JOIN "+join, rest...)
+}
+
+// LeftJoin adds a LEFT JOIN clause to the query.
+func (b DeleteBuilder) LeftJoin(join string, rest ...interface{}) DeleteBuilder {
+	return b.JoinClause("LEFT JOIN "+join, rest...)
+}
+
+// RightJoin adds a RIGHT JOIN clause to the query.
+func (b DeleteBuilder) RightJoin(join string, rest ...interface{}) DeleteBuilder {
+	return b.JoinClause("RIGHT JOIN "+join, rest...)
+}
+
+// InnerJoin adds a INNER JOIN clause to the query.
+func (b DeleteBuilder) InnerJoin(join string, rest ...interface{}) DeleteBuilder {
+	return b.JoinClause("INNER JOIN "+join, rest...)
+}
+
+// CrossJoin adds a CROSS JOIN clause to the query.
+func (b DeleteBuilder) CrossJoin(join string, rest ...interface{}) DeleteBuilder {
+	return b.JoinClause("CROSS JOIN "+join, rest...)
+}

delete_test.go

@@ -10,6 +10,12 @@ func TestDeleteBuilderToSql(t *testing.T) {
 	b := Delete("").
 		Prefix("WITH prefix AS ?", 0).
 		From("a").
+		JoinClause("CROSS JOIN j1").
+		Join("j2").
+		LeftJoin("j3").
+		RightJoin("j4").
+		InnerJoin("j5").
+		CrossJoin("j6").
 		Where("b = ?", 1).
 		OrderBy("c").
 		Limit(2).
@@ -21,7 +27,9 @@ func TestDeleteBuilderToSql(t *testing.T) {
 
 	expectedSql :=
 		"WITH prefix AS ? " +
-			"DELETE FROM a WHERE b = ? ORDER BY c LIMIT 2 OFFSET 3 " +
+			"DELETE FROM a " +
+			"CROSS JOIN j1 JOIN j2 LEFT JOIN j3 RIGHT JOIN j4 INNER JOIN j5 CROSS JOIN j6 " +
+			"WHERE b = ? ORDER BY c LIMIT 2 OFFSET 3 " +
 			"RETURNING ?"
 	assert.Equal(t, expectedSql, sql)