Add database/sql support to pgtype

pgtype/database_sql.go

@@ -2,47 +2,13 @@ package pgtype
 
 import (
 	"bytes"
+	"database/sql/driver"
 	"errors"
 )
 
 func DatabaseSQLValue(ci *ConnInfo, src Value) (interface{}, error) {
-	switch src := src.(type) {
-	case *Bool:
-		return src.Bool, nil
-	case *Bytea:
-		return src.Bytes, nil
-	case *Date:
-		if src.InfinityModifier == None {
-			return src.Time, nil
-		}
-	case *Float4:
-		return float64(src.Float), nil
-	case *Float8:
-		return src.Float, nil
-	case *GenericBinary:
-		return src.Bytes, nil
-	case *GenericText:
-		return src.String, nil
-	case *Int2:
-		return int64(src.Int), nil
-	case *Int4:
-		return int64(src.Int), nil
-	case *Int8:
-		return int64(src.Int), nil
-	case *Text:
-		return src.String, nil
-	case *Timestamp:
-		if src.InfinityModifier == None {
-			return src.Time, nil
-		}
-	case *Timestamptz:
-		if src.InfinityModifier == None {
-			return src.Time, nil
-		}
-	case *Unknown:
-		return src.String, nil
-	case *Varchar:
-		return src.String, nil
+	if valuer, ok := src.(driver.Valuer); ok {
+		return valuer.Value()
 	}
 
 	buf := &bytes.Buffer{}
@@ -64,3 +30,15 @@ func DatabaseSQLValue(ci *ConnInfo, src Value) (interface{}, error) {
 
 	return nil, errors.New("cannot convert to database/sql compatible value")
 }
+
+func encodeValueText(src TextEncoder) (interface{}, error) {
+	buf := &bytes.Buffer{}
+	null, err := src.EncodeText(nil, buf)
+	if err != nil {
+		return nil, err
+	}
+	if null {
+		return nil, nil
+	}
+	return buf.String(), err
+}