diff --git a/go.mod b/go.mod
index 47e0bd3..f7e4ea2 100644
--- a/go.mod
+++ b/go.mod
@@ -4,6 +4,7 @@ go 1.14
 
 require (
 	github.com/go-sql-driver/mysql v1.6.0
-	github.com/jinzhu/now v1.1.5 // indirect
 	gorm.io/gorm v1.23.8
 )
+
+require github.com/jinzhu/now v1.1.5 // indirect
diff --git a/migrator.go b/migrator.go
index 5c706c4..47b116b 100644
--- a/migrator.go
+++ b/migrator.go
@@ -317,10 +317,8 @@ func groupByIndexName(indexList []*Index) map[string][]*Index {
 }
 
 func (m Migrator) CurrentSchema(stmt *gorm.Statement, table string) (string, string) {
-	if strings.Contains(table, ".") {
-		if tables := strings.Split(table, `.`); len(tables) == 2 {
-			return tables[0], tables[1]
-		}
+	if tables := strings.Split(table, `.`); len(tables) == 2 {
+		return tables[0], tables[1]
 	}
 
 	return m.CurrentDatabase(), table
diff --git a/mysql.go b/mysql.go
index 6f764de..5772a65 100644
--- a/mysql.go
+++ b/mysql.go
@@ -11,6 +11,7 @@ import (
 	"time"
 
 	"github.com/go-sql-driver/mysql"
+
 	"gorm.io/gorm"
 	"gorm.io/gorm/callbacks"
 	"gorm.io/gorm/clause"
@@ -76,22 +77,20 @@ func (dialector Dialector) NowFunc(n int) func() time.Time {
 }
 
 func (dialector Dialector) Apply(config *gorm.Config) error {
-	if config.NowFunc == nil {
-		if dialector.DefaultDatetimePrecision == nil {
-			dialector.DefaultDatetimePrecision = &defaultDatetimePrecision
-		}
-
-		// while maintaining the readability of the code, separate the business logic from
-		// the general part and leave it to the function to do it here.
-		config.NowFunc = dialector.NowFunc(*dialector.DefaultDatetimePrecision)
+	if config.NowFunc != nil {
+		return nil
 	}
 
+	if dialector.DefaultDatetimePrecision == nil {
+		dialector.DefaultDatetimePrecision = &defaultDatetimePrecision
+	}
+	// while maintaining the readability of the code, separate the business logic from
+	// the general part and leave it to the function to do it here.
+	config.NowFunc = dialector.NowFunc(*dialector.DefaultDatetimePrecision)
 	return nil
 }
 
 func (dialector Dialector) Initialize(db *gorm.DB) (err error) {
-	ctx := context.Background()
-
 	if dialector.DriverName == "" {
 		dialector.DriverName = "mysql"
 	}
@@ -111,7 +110,7 @@ func (dialector Dialector) Initialize(db *gorm.DB) (err error) {
 
 	withReturning := false
 	if !dialector.Config.SkipInitializeWithVersion {
-		err = db.ConnPool.QueryRowContext(ctx, "SELECT VERSION()").Scan(&dialector.ServerVersion)
+		err = db.ConnPool.QueryRowContext(context.Background(), "SELECT VERSION()").Scan(&dialector.ServerVersion)
 		if err != nil {
 			return err
 		}
@@ -121,9 +120,7 @@ func (dialector Dialector) Initialize(db *gorm.DB) (err error) {
 			dialector.Config.DontSupportRenameColumn = true
 			dialector.Config.DontSupportForShareClause = true
 			dialector.Config.DontSupportNullAsDefaultValue = true
-			if checkVersion(dialector.ServerVersion, "10.5") {
-				withReturning = true
-			}
+			withReturning = checkVersion(dialector.ServerVersion, "10.5")
 		} else if strings.HasPrefix(dialector.ServerVersion, "5.6.") {
 			dialector.Config.DontSupportRenameIndex = true
 			dialector.Config.DontSupportRenameColumn = true
@@ -176,7 +173,7 @@ const (
 	ClauseOnConflict = "ON CONFLICT"
 	// ClauseValues for clause.ClauseBuilder VALUES key
 	ClauseValues = "VALUES"
-	// ClauseValues for clause.ClauseBuilder FOR key
+	// ClauseFor for clause.ClauseBuilder FOR key
 	ClauseFor = "FOR"
 )
 
@@ -393,11 +390,11 @@ func (dialector Dialector) getSchemaStringType(field *schema.Field) string {
 }
 
 func (dialector Dialector) getSchemaTimeType(field *schema.Field) string {
-	precision := ""
 	if !dialector.DisableDatetimePrecision && field.Precision == 0 {
 		field.Precision = *dialector.DefaultDatetimePrecision
 	}
 
+	var precision string
 	if field.Precision > 0 {
 		precision = fmt.Sprintf("(%d)", field.Precision)
 	}
@@ -421,27 +418,31 @@ func (dialector Dialector) getSchemaBytesType(field *schema.Field) string {
 }
 
 func (dialector Dialector) getSchemaIntAndUnitType(field *schema.Field) string {
-	sqlType := "bigint"
+	constraint := func(sqlType string) string {
+		if field.DataType == schema.Uint {
+			sqlType += " unsigned"
+		}
+		if field.NotNull {
+			sqlType += " NOT NULL"
+		}
+		if field.AutoIncrement {
+			sqlType += " AUTO_INCREMENT"
+		}
+		return sqlType
+	}
+
 	switch {
 	case field.Size <= 8:
-		sqlType = "tinyint"
+		return constraint("tinyint")
 	case field.Size <= 16:
-		sqlType = "smallint"
+		return constraint("smallint")
 	case field.Size <= 24:
-		sqlType = "mediumint"
+		return constraint("mediumint")
 	case field.Size <= 32:
-		sqlType = "int"
-	}
-
-	if field.DataType == schema.Uint {
-		sqlType += " unsigned"
-	}
-
-	if field.AutoIncrement {
-		sqlType += " AUTO_INCREMENT"
+		return constraint("int")
+	default:
+		return constraint("bigint")
 	}
-
-	return sqlType
 }
 
 func (dialector Dialector) getSchemaCustomType(field *schema.Field) string {
@@ -462,23 +463,25 @@ func (dialector Dialector) RollbackTo(tx *gorm.DB, name string) error {
 	return tx.Exec("ROLLBACK TO SAVEPOINT " + name).Error
 }
 
-var versionTrimerRegexp = regexp.MustCompile(`^(\d+).*$`)
-
 // checkVersion newer or equal returns true, old returns false
 func checkVersion(newVersion, oldVersion string) bool {
 	if newVersion == oldVersion {
 		return true
 	}
 
-	newVersions := strings.Split(newVersion, ".")
-	oldVersions := strings.Split(oldVersion, ".")
+	var (
+		versionTrimmerRegexp = regexp.MustCompile(`^(\d+).*$`)
+
+		newVersions = strings.Split(newVersion, ".")
+		oldVersions = strings.Split(oldVersion, ".")
+	)
 	for idx, nv := range newVersions {
 		if len(oldVersions) <= idx {
 			return true
 		}
 
-		nvi, _ := strconv.Atoi(versionTrimerRegexp.ReplaceAllString(nv, "$1"))
-		ovi, _ := strconv.Atoi(versionTrimerRegexp.ReplaceAllString(oldVersions[idx], "$1"))
+		nvi, _ := strconv.Atoi(versionTrimmerRegexp.ReplaceAllString(nv, "$1"))
+		ovi, _ := strconv.Atoi(versionTrimmerRegexp.ReplaceAllString(oldVersions[idx], "$1"))
 		if nvi == ovi {
 			continue
 		}