remove package dialect for easier contribution

dialect.go

@@ -1,4 +1,4 @@
-package dialect
+package gorm
 
 import (
 	"reflect"
@@ -16,7 +16,7 @@ type Dialect interface {
 	Quote(key string) string
 }
 
-func New(driver string) Dialect {
+func NewDialect(driver string) Dialect {
 	var d Dialect
 	switch driver {
 	case "postgres":

main.go

@@ -2,8 +2,6 @@ package gorm
 
 import (
 	"database/sql"
-
-	"github.com/jinzhu/gorm/dialect"
 )
 
 type DB struct {
@@ -15,14 +13,14 @@ type DB struct {
 	search        *search
 	logMode       int
 	logger        logger
-	dialect       dialect.Dialect
+	dialect       Dialect
 	tagIdentifier string
 	singularTable bool
 }
 
 func Open(driver, source string) (DB, error) {
 	var err error
-	db := DB{dialect: dialect.New(driver), tagIdentifier: "sql", logger: defaultLogger, callback: DefaultCallback}
+	db := DB{dialect: NewDialect(driver), tagIdentifier: "sql", logger: defaultLogger, callback: DefaultCallback}
 	db.db, err = sql.Open(driver, source)
 	db.parent = &db
 	return db, err

mysql.go

@@ -1,7 +1,8 @@
-package dialect
+package gorm
 
 import (
 	"fmt"
+
 	"reflect"
 )
 
@@ -59,10 +60,18 @@ func (s *mysql) PrimaryKeyTag(value reflect.Value, size int) string {
 	}
 }
 
-func (s *mysql) ReturningStr(key string) (str string) {
-	return
+func (s *mysql) ReturningStr(key string) string {
+	return ""
 }
 
-func (s *mysql) Quote(key string) (str string) {
+func (s *mysql) Quote(key string) string {
 	return fmt.Sprintf("`%s`", key)
 }
+
+func (s *mysql) HasTable(tableName string) bool {
+	return true
+}
+
+func (s *mysql) HasColumn(tableName string, columnName string) bool {
+	return true
+}

postgres.go

@@ -1,4 +1,4 @@
-package dialect
+package gorm
 
 import (
 	"fmt"
@@ -54,10 +54,10 @@ func (s *postgres) PrimaryKeyTag(value reflect.Value, size int) string {
 	}
 }
 
-func (s *postgres) ReturningStr(key string) (str string) {
+func (s *postgres) ReturningStr(key string) string {
 	return fmt.Sprintf("RETURNING \"%v\"", key)
 }
 
-func (s *postgres) Quote(key string) (str string) {
+func (s *postgres) Quote(key string) string {
 	return fmt.Sprintf("\"%s\"", key)
 }

scope.go

@@ -3,7 +3,6 @@ package gorm
 import (
 	"errors"
 	"fmt"
-	"github.com/jinzhu/gorm/dialect"
 	"go/ast"
 	"strings"
 	"time"
@@ -55,7 +54,7 @@ func (scope *Scope) Quote(str string) string {
 }
 
 // Dialect get dialect
-func (scope *Scope) Dialect() dialect.Dialect {
+func (scope *Scope) Dialect() Dialect {
 	return scope.db.parent.dialect
 }
 

sqlite3.go

@@ -1,4 +1,4 @@
-package dialect
+package gorm
 
 import (
 	"fmt"