diff --git a/ddlmod.go b/ddlmod.go
index 7cb1642..c8db01f 100644
--- a/ddlmod.go
+++ b/ddlmod.go
@@ -5,6 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"regexp"
+	"strconv"
 	"strings"
 
 	"gorm.io/gorm/migrator"
@@ -12,12 +13,13 @@ import (
 
 var (
 	sqliteSeparator    = "`|\"|'|\t"
-	indexRegexp        = regexp.MustCompile(fmt.Sprintf("CREATE(?: UNIQUE)? INDEX [%v]?[\\w\\d]+[%v]? ON (.*)$", sqliteSeparator, sqliteSeparator))
-	tableRegexp        = regexp.MustCompile(fmt.Sprintf("(?i)(CREATE TABLE [%v]?[\\w\\d]+[%v]?)(?: \\((.*)\\))?", sqliteSeparator, sqliteSeparator))
+	indexRegexp        = regexp.MustCompile(fmt.Sprintf("CREATE(?: UNIQUE)? INDEX [%v]?[\\w\\d-]+[%v]? ON (.*)$", sqliteSeparator, sqliteSeparator))
+	tableRegexp        = regexp.MustCompile(fmt.Sprintf("(?i)(CREATE TABLE [%v]?[\\w\\d-]+[%v]?)(?: \\((.*)\\))?", sqliteSeparator, sqliteSeparator))
 	separatorRegexp    = regexp.MustCompile(fmt.Sprintf("[%v]", sqliteSeparator))
 	columnsRegexp      = regexp.MustCompile(fmt.Sprintf("\\([%v]?([\\w\\d]+)[%v]?(?:,[%v]?([\\w\\d]+)[%v]){0,}\\)", sqliteSeparator, sqliteSeparator, sqliteSeparator, sqliteSeparator))
 	columnRegexp       = regexp.MustCompile(fmt.Sprintf("^[%v]?([\\w\\d]+)[%v]?\\s+([\\w\\(\\)\\d]+)(.*)$", sqliteSeparator, sqliteSeparator))
 	defaultValueRegexp = regexp.MustCompile("(?i) DEFAULT \\(?(.+)?\\)?( |COLLATE|GENERATED|$)")
+	regRealDataType    = regexp.MustCompile(`[^\d](\d+)[^\d]?`)
 )
 
 type ddl struct {
@@ -116,7 +118,7 @@ func parseDDL(strs ...string) (*ddl, error) {
 						PrimaryKeyValue:   sql.NullBool{Valid: true},
 						UniqueValue:       sql.NullBool{Valid: true},
 						NullableValue:     sql.NullBool{Valid: true},
-						DefaultValueValue: sql.NullString{Valid: true},
+						DefaultValueValue: sql.NullString{Valid: false},
 					}
 
 					matchUpper := strings.ToUpper(matches[3])
@@ -135,6 +137,14 @@ func parseDDL(strs ...string) (*ddl, error) {
 						columnType.DefaultValueValue = sql.NullString{String: strings.Trim(defaultMatches[1], `"`), Valid: true}
 					}
 
+					// data type length
+					matches := regRealDataType.FindAllStringSubmatch(columnType.DataTypeValue.String, -1)
+					if len(matches) == 1 && len(matches[0]) == 2 {
+						size, _ := strconv.Atoi(matches[0][1])
+						columnType.LengthValue = sql.NullInt64{Valid: true, Int64: int64(size)}
+						columnType.DataTypeValue.String = strings.TrimSuffix(columnType.DataTypeValue.String, matches[0][0])
+					}
+
 					result.columns = append(result.columns, columnType)
 				}
 			}
diff --git a/ddlmod_test.go b/ddlmod_test.go
index 2439640..5e7a840 100644
--- a/ddlmod_test.go
+++ b/ddlmod_test.go
@@ -4,8 +4,8 @@ import (
 	"database/sql"
 	"testing"
 
-	"github.com/stretchr/testify/assert"
 	"gorm.io/gorm/migrator"
+	"gorm.io/gorm/utils/tests"
 )
 
 func TestParseDDL(t *testing.T) {
@@ -19,29 +19,48 @@ func TestParseDDL(t *testing.T) {
 			"CREATE TABLE `notes` (`id` integer NOT NULL,`text` varchar(500) DEFAULT \"hello\",`age` integer DEFAULT 18,`user_id` integer,PRIMARY KEY (`id`),CONSTRAINT `fk_users_notes` FOREIGN KEY (`user_id`) REFERENCES `users`(`id`))",
 			"CREATE UNIQUE INDEX `idx_profiles_refer` ON `profiles`(`text`)",
 		}, 6, []migrator.ColumnType{
-			{NameValue: sql.NullString{String: "id", Valid: true}, DataTypeValue: sql.NullString{String: "integer", Valid: true}, ColumnTypeValue: sql.NullString{String: "integer", Valid: true}, PrimaryKeyValue: sql.NullBool{Bool: true, Valid: true}, NullableValue: sql.NullBool{Valid: true}, UniqueValue: sql.NullBool{Valid: true}, DefaultValueValue: sql.NullString{Valid: true}},
-			{NameValue: sql.NullString{String: "text", Valid: true}, DataTypeValue: sql.NullString{String: "varchar(500)", Valid: true}, ColumnTypeValue: sql.NullString{String: "varchar(500)", Valid: true}, DefaultValueValue: sql.NullString{String: "hello", Valid: true}, NullableValue: sql.NullBool{Valid: true}, UniqueValue: sql.NullBool{Valid: true}, PrimaryKeyValue: sql.NullBool{Valid: true}},
+			{NameValue: sql.NullString{String: "id", Valid: true}, DataTypeValue: sql.NullString{String: "integer", Valid: true}, ColumnTypeValue: sql.NullString{String: "integer", Valid: true}, PrimaryKeyValue: sql.NullBool{Bool: true, Valid: true}, NullableValue: sql.NullBool{Valid: true}, UniqueValue: sql.NullBool{Valid: true}, DefaultValueValue: sql.NullString{Valid: false}},
+			{NameValue: sql.NullString{String: "text", Valid: true}, DataTypeValue: sql.NullString{String: "varchar", Valid: true}, LengthValue: sql.NullInt64{Int64: 500, Valid: true}, ColumnTypeValue: sql.NullString{String: "varchar(500)", Valid: true}, DefaultValueValue: sql.NullString{String: "hello", Valid: true}, NullableValue: sql.NullBool{Valid: true}, UniqueValue: sql.NullBool{Valid: true}, PrimaryKeyValue: sql.NullBool{Valid: true}},
 			{NameValue: sql.NullString{String: "age", Valid: true}, DataTypeValue: sql.NullString{String: "integer", Valid: true}, ColumnTypeValue: sql.NullString{String: "integer", Valid: true}, DefaultValueValue: sql.NullString{String: "18", Valid: true}, NullableValue: sql.NullBool{Valid: true}, UniqueValue: sql.NullBool{Valid: true}, PrimaryKeyValue: sql.NullBool{Valid: true}},
-			{NameValue: sql.NullString{String: "user_id", Valid: true}, DataTypeValue: sql.NullString{String: "integer", Valid: true}, ColumnTypeValue: sql.NullString{String: "integer", Valid: true}, DefaultValueValue: sql.NullString{Valid: true}, NullableValue: sql.NullBool{Valid: true}, UniqueValue: sql.NullBool{Valid: true}, PrimaryKeyValue: sql.NullBool{Valid: true}},
+			{NameValue: sql.NullString{String: "user_id", Valid: true}, DataTypeValue: sql.NullString{String: "integer", Valid: true}, ColumnTypeValue: sql.NullString{String: "integer", Valid: true}, DefaultValueValue: sql.NullString{Valid: false}, NullableValue: sql.NullBool{Valid: true}, UniqueValue: sql.NullBool{Valid: true}, PrimaryKeyValue: sql.NullBool{Valid: true}},
 		},
 		},
 		{"with_check", []string{"CREATE TABLE Persons (ID int NOT NULL,LastName varchar(255) NOT NULL,FirstName varchar(255),Age int,CHECK (Age>=18),CHECK (FirstName<>'John'))"}, 6, []migrator.ColumnType{
-			{NameValue: sql.NullString{String: "ID", Valid: true}, DataTypeValue: sql.NullString{String: "int", Valid: true}, ColumnTypeValue: sql.NullString{String: "int", Valid: true}, NullableValue: sql.NullBool{Valid: true}, DefaultValueValue: sql.NullString{Valid: true}, UniqueValue: sql.NullBool{Valid: true}, PrimaryKeyValue: sql.NullBool{Valid: true}},
-			{NameValue: sql.NullString{String: "LastName", Valid: true}, DataTypeValue: sql.NullString{String: "varchar(255)", Valid: true}, ColumnTypeValue: sql.NullString{String: "varchar(255)", Valid: true}, NullableValue: sql.NullBool{Bool: false, Valid: true}, DefaultValueValue: sql.NullString{Valid: true}, UniqueValue: sql.NullBool{Valid: true}, PrimaryKeyValue: sql.NullBool{Valid: true}},
-			{NameValue: sql.NullString{String: "FirstName", Valid: true}, DataTypeValue: sql.NullString{String: "varchar(255)", Valid: true}, ColumnTypeValue: sql.NullString{String: "varchar(255)", Valid: true}, DefaultValueValue: sql.NullString{Valid: true}, NullableValue: sql.NullBool{Valid: true}, UniqueValue: sql.NullBool{Valid: true}, PrimaryKeyValue: sql.NullBool{Valid: true}},
-			{NameValue: sql.NullString{String: "Age", Valid: true}, DataTypeValue: sql.NullString{String: "int", Valid: true}, ColumnTypeValue: sql.NullString{String: "int", Valid: true}, DefaultValueValue: sql.NullString{Valid: true}, NullableValue: sql.NullBool{Valid: true}, UniqueValue: sql.NullBool{Valid: true}, PrimaryKeyValue: sql.NullBool{Valid: true}},
+			{NameValue: sql.NullString{String: "ID", Valid: true}, DataTypeValue: sql.NullString{String: "int", Valid: true}, ColumnTypeValue: sql.NullString{String: "int", Valid: true}, NullableValue: sql.NullBool{Valid: true}, DefaultValueValue: sql.NullString{Valid: false}, UniqueValue: sql.NullBool{Valid: true}, PrimaryKeyValue: sql.NullBool{Valid: true}},
+			{NameValue: sql.NullString{String: "LastName", Valid: true}, DataTypeValue: sql.NullString{String: "varchar", Valid: true}, LengthValue: sql.NullInt64{Int64: 255, Valid: true}, ColumnTypeValue: sql.NullString{String: "varchar(255)", Valid: true}, NullableValue: sql.NullBool{Bool: false, Valid: true}, DefaultValueValue: sql.NullString{Valid: false}, UniqueValue: sql.NullBool{Valid: true}, PrimaryKeyValue: sql.NullBool{Valid: true}},
+			{NameValue: sql.NullString{String: "FirstName", Valid: true}, DataTypeValue: sql.NullString{String: "varchar", Valid: true}, LengthValue: sql.NullInt64{Int64: 255, Valid: true}, ColumnTypeValue: sql.NullString{String: "varchar(255)", Valid: true}, DefaultValueValue: sql.NullString{Valid: false}, NullableValue: sql.NullBool{Valid: true}, UniqueValue: sql.NullBool{Valid: true}, PrimaryKeyValue: sql.NullBool{Valid: true}},
+			{NameValue: sql.NullString{String: "Age", Valid: true}, DataTypeValue: sql.NullString{String: "int", Valid: true}, ColumnTypeValue: sql.NullString{String: "int", Valid: true}, DefaultValueValue: sql.NullString{Valid: false}, NullableValue: sql.NullBool{Valid: true}, UniqueValue: sql.NullBool{Valid: true}, PrimaryKeyValue: sql.NullBool{Valid: true}},
 		}},
 		{"lowercase", []string{"create table test (ID int NOT NULL)"}, 1, []migrator.ColumnType{
-			{NameValue: sql.NullString{String: "ID", Valid: true}, DataTypeValue: sql.NullString{String: "int", Valid: true}, ColumnTypeValue: sql.NullString{String: "int", Valid: true}, NullableValue: sql.NullBool{Bool: false, Valid: true}, DefaultValueValue: sql.NullString{Valid: true}, UniqueValue: sql.NullBool{Valid: true}, PrimaryKeyValue: sql.NullBool{Valid: true}},
+			{NameValue: sql.NullString{String: "ID", Valid: true}, DataTypeValue: sql.NullString{String: "int", Valid: true}, ColumnTypeValue: sql.NullString{String: "int", Valid: true}, NullableValue: sql.NullBool{Bool: false, Valid: true}, DefaultValueValue: sql.NullString{Valid: false}, UniqueValue: sql.NullBool{Valid: true}, PrimaryKeyValue: sql.NullBool{Valid: true}},
 		},
 		},
 		{"no brackets", []string{"create table test"}, 0, nil},
 		{"with_special_characters", []string{
 			"CREATE TABLE `test` (`text` varchar(10) DEFAULT \"测试，\")",
 		}, 1, []migrator.ColumnType{
-			{NameValue: sql.NullString{String: "text", Valid: true}, DataTypeValue: sql.NullString{String: "varchar(10)", Valid: true}, ColumnTypeValue: sql.NullString{String: "varchar(10)", Valid: true}, DefaultValueValue: sql.NullString{String: "测试，", Valid: true}, NullableValue: sql.NullBool{Valid: true}, UniqueValue: sql.NullBool{Valid: true}, PrimaryKeyValue: sql.NullBool{Valid: true}},
+			{NameValue: sql.NullString{String: "text", Valid: true}, DataTypeValue: sql.NullString{String: "varchar", Valid: true}, LengthValue: sql.NullInt64{Int64: 10, Valid: true}, ColumnTypeValue: sql.NullString{String: "varchar(10)", Valid: true}, DefaultValueValue: sql.NullString{String: "测试，", Valid: true}, NullableValue: sql.NullBool{Valid: true}, UniqueValue: sql.NullBool{Valid: true}, PrimaryKeyValue: sql.NullBool{Valid: true}},
 		},
 		},
+		{
+			"table_name_with_dash",
+			[]string{
+				"CREATE TABLE `test-a` (`id` int NOT NULL)",
+				"CREATE UNIQUE INDEX `idx_test-a_id` ON `test-a`(`id`)",
+			},
+			1,
+			[]migrator.ColumnType{
+				{
+					NameValue:         sql.NullString{String: "id", Valid: true},
+					DataTypeValue:     sql.NullString{String: "int", Valid: true},
+					ColumnTypeValue:   sql.NullString{String: "int", Valid: true},
+					NullableValue:     sql.NullBool{Bool: false, Valid: true},
+					DefaultValueValue: sql.NullString{Valid: false},
+					UniqueValue:       sql.NullBool{Valid: true},
+					PrimaryKeyValue:   sql.NullBool{Valid: true},
+				},
+			},
+		},
 	}
 
 	for _, p := range params {
@@ -52,9 +71,11 @@ func TestParseDDL(t *testing.T) {
 				panic(err.Error())
 			}
 
-			assert.Equal(t, p.sql[0], ddl.compile())
-			assert.Len(t, ddl.fields, p.nFields)
-			assert.Equal(t, ddl.columns, p.columns)
+			tests.AssertEqual(t, p.sql[0], ddl.compile())
+			if len(ddl.fields) != p.nFields {
+				t.Fatalf("fields length doesn't match: expect: %v, got %v", p.nFields, len(ddl.fields))
+			}
+			tests.AssertEqual(t, ddl.columns, p.columns)
 		})
 	}
 }
@@ -122,7 +143,7 @@ func TestAddConstraint(t *testing.T) {
 			testDDL := ddl{fields: p.fields}
 
 			testDDL.addConstraint(p.cName, p.sql)
-			assert.Equal(t, p.expect, testDDL.fields)
+			tests.AssertEqual(t, p.expect, testDDL.fields)
 		})
 	}
 }
@@ -164,8 +185,8 @@ func TestRemoveConstraint(t *testing.T) {
 
 			success := testDDL.removeConstraint(p.cName)
 
-			assert.Equal(t, p.success, success)
-			assert.Equal(t, p.expect, testDDL.fields)
+			tests.AssertEqual(t, p.success, success)
+			tests.AssertEqual(t, p.expect, testDDL.fields)
 		})
 	}
 }
@@ -202,7 +223,7 @@ func TestGetColumns(t *testing.T) {
 
 			cols := testDDL.getColumns()
 
-			assert.Equal(t, p.columns, cols)
+			tests.AssertEqual(t, p.columns, cols)
 		})
 	}
 }
diff --git a/go.mod b/go.mod
index daeef5e..9cf9eb3 100644
--- a/go.mod
+++ b/go.mod
@@ -3,9 +3,7 @@ module gorm.io/driver/sqlite
 go 1.14
 
 require (
-	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/jinzhu/now v1.1.5 // indirect
 	github.com/mattn/go-sqlite3 v1.14.12
-	github.com/stretchr/testify v1.7.0
 	gorm.io/gorm v1.23.4
 )
diff --git a/go.sum b/go.sum
index c9f46fb..98e3d78 100644
--- a/go.sum
+++ b/go.sum
@@ -1,24 +1,9 @@
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
-github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
 github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
-github.com/jinzhu/now v1.1.4 h1:tHnRBy1i5F2Dh8BAFxqFzxKqqvezXrL2OW1TnX+Mlas=
 github.com/jinzhu/now v1.1.4/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
 github.com/jinzhu/now v1.1.5 h1:/o9tlHleP7gOFmsnYNz3RGnqzefHA47wQpKrrdTIwXQ=
 github.com/jinzhu/now v1.1.5/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
-github.com/mattn/go-sqlite3 v1.14.9 h1:10HX2Td0ocZpYEjhilsuo6WWtUqttj2Kb0KtD86/KYA=
-github.com/mattn/go-sqlite3 v1.14.9/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=
 github.com/mattn/go-sqlite3 v1.14.12 h1:TJ1bhYJPV44phC+IMu1u2K/i5RriLTPe+yc68XDJ1Z0=
 github.com/mattn/go-sqlite3 v1.14.12/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=
-github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
-github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
-github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gorm.io/gorm v1.23.4 h1:1BKWM67O6CflSLcwGQR7ccfmC4ebOxQrTfOQGRE9wjg=
 gorm.io/gorm v1.23.4/go.mod h1:l2lP/RyAtc1ynaTjFksBde/O8v9oOGIApu2/xRitmZk=
diff --git a/migrator.go b/migrator.go
index 641b1f4..9d11cfc 100644
--- a/migrator.go
+++ b/migrator.go
@@ -80,12 +80,17 @@ func (m Migrator) AlterColumn(value interface{}, name string) error {
 	return m.RunWithoutForeignKey(func() error {
 		return m.recreateTable(value, nil, func(rawDDL string, stmt *gorm.Statement) (sql string, sqlArgs []interface{}, err error) {
 			if field := stmt.Schema.LookUpField(name); field != nil {
-				reg, err := regexp.Compile("(`|'|\"| )" + field.DBName + "(`|'|\"| ) .*?,")
+				// lookup field from table definition, ddl might looks like `'name' int,` or `'name' int)`
+				reg, err := regexp.Compile("(`|'|\"| )" + field.DBName + "(`|'|\"| ) .*?(,|\\)\\s*$)")
 				if err != nil {
 					return "", nil, err
 				}
 
-				createSQL := reg.ReplaceAllString(rawDDL, fmt.Sprintf("`%v` ?,", field.DBName))
+				createSQL := reg.ReplaceAllString(rawDDL, fmt.Sprintf("`%v` ?$3", field.DBName))
+
+				if createSQL == rawDDL {
+					return "", nil, fmt.Errorf("failed to look up field %v from DDL %v", field.DBName, rawDDL)
+				}
 
 				return createSQL, []interface{}{m.FullDataTypeOf(field)}, nil
 			}