Fix insert ignore for postgres and sqlite.

Author: zhongr3n

flavor.go

@@ -131,3 +131,27 @@ func (f Flavor) Quote(name string) string {
 
 	return name
 }
+
+// PrepareInsertIgnore prepares the insert builder to build insert ignore SQL statement based on the sql flavor
+func (f Flavor) PrepareInsertIgnore(table string, ib *InsertBuilder) {
+	switch ib.args.Flavor {
+	case MySQL:
+		ib.verb = "INSERT IGNORE"
+	case PostgreSQL:
+		// see https://www.postgresql.org/docs/current/sql-insert.html
+		ib.verb = "INSERT"
+		// add sql statement at the end after values, i.e. INSERT INTO ... ON CONFLICT DO NOTHING
+		ib.marker = insertMarkerAfterValues
+		ib.SQL("ON CONFLICT DO NOTHING")
+	case SQLite:
+		// see https://www.sqlite.org/lang_insert.html
+		ib.verb = "INSERT OR IGNORE"
+	default:
+		// panic if the db flavor is not supported
+		panic(fmt.Errorf("unsupported db flavor: %s", ib.args.Flavor.String()))
+	}
+
+	// Set the table and reset the marker right after insert into
+	ib.table = Escape(table)
+	ib.marker = insertMarkerAfterInsertInto
+}

insert.go

@@ -64,9 +64,7 @@ func InsertIgnoreInto(table string) *InsertBuilder {
 
 // InsertIgnoreInto sets table name in INSERT IGNORE.
 func (ib *InsertBuilder) InsertIgnoreInto(table string) *InsertBuilder {
-	ib.verb = "INSERT IGNORE"
-	ib.table = Escape(table)
-	ib.marker = insertMarkerAfterInsertInto
+	ib.args.Flavor.PrepareInsertIgnore(table, ib)
 	return ib
 }
 

insert_test.go

@@ -81,6 +81,38 @@ func ExampleInsertBuilder_insertIgnore() {
 	// [1 Huan Du 1 2 Charmy Liu 1 1234567890]
 }
 
+func ExampleInsertBuilder_insertIgnore_postgres() {
+	ib := PostgreSQL.NewInsertBuilder()
+	ib.InsertIgnoreInto("demo.user")
+	ib.Cols("id", "name", "status", "created_at")
+	ib.Values(1, "Huan Du", 1, Raw("UNIX_TIMESTAMP(NOW())"))
+	ib.Values(2, "Charmy Liu", 1, 1234567890)
+
+	sql, args := ib.Build()
+	fmt.Println(sql)
+	fmt.Println(args)
+
+	// Output:
+	// INSERT INTO demo.user (id,name,status,created_at) VALUES ($1,$2,$3,UNIX_TIMESTAMP(NOW())),($4,$5,$6,$7) ON CONFLICT DO NOTHING
+	// [1 Huan Du 1 2 Charmy Liu 1 1234567890]
+}
+
+func ExampleInsertBuilder_insertIgnore_sqlite() {
+	ib := SQLite.NewInsertBuilder()
+	ib.InsertIgnoreInto("demo.user")
+	ib.Cols("id", "name", "status", "created_at")
+	ib.Values(1, "Huan Du", 1, Raw("UNIX_TIMESTAMP(NOW())"))
+	ib.Values(2, "Charmy Liu", 1, 1234567890)
+
+	sql, args := ib.Build()
+	fmt.Println(sql)
+	fmt.Println(args)
+
+	// Output:
+	// INSERT OR IGNORE INTO demo.user (id,name,status,created_at) VALUES (?,?,?,UNIX_TIMESTAMP(NOW())),(?,?,?,?)
+	// [1 Huan Du 1 2 Charmy Liu 1 1234567890]
+}
+
 func ExampleInsertBuilder_replaceInto() {
 	ib := NewInsertBuilder()
 	ib.ReplaceInto("demo.user")