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migrator.go
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migrator.go
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package sqlite
import (
"database/sql"
"fmt"
"strings"
"gorm.io/gorm"
"gorm.io/gorm/clause"
"gorm.io/gorm/migrator"
"gorm.io/gorm/schema"
)
type Migrator struct {
migrator.Migrator
}
func (m *Migrator) RunWithoutForeignKey(fc func() error) error {
var enabled int
m.DB.Raw("PRAGMA foreign_keys").Scan(&enabled)
if enabled == 1 {
m.DB.Exec("PRAGMA foreign_keys = OFF")
defer m.DB.Exec("PRAGMA foreign_keys = ON")
}
return fc()
}
func (m Migrator) HasTable(value interface{}) bool {
var count int
m.Migrator.RunWithValue(value, func(stmt *gorm.Statement) error {
return m.DB.Raw("SELECT count(*) FROM sqlite_master WHERE type='table' AND name=?", stmt.Table).Row().Scan(&count)
})
return count > 0
}
func (m Migrator) DropTable(values ...interface{}) error {
return m.RunWithoutForeignKey(func() error {
values = m.ReorderModels(values, false)
tx := m.DB.Session(&gorm.Session{})
for i := len(values) - 1; i >= 0; i-- {
if err := m.RunWithValue(values[i], func(stmt *gorm.Statement) error {
return tx.Exec("DROP TABLE IF EXISTS ?", clause.Table{Name: stmt.Table}).Error
}); err != nil {
return err
}
}
return nil
})
}
func (m Migrator) GetTables() (tableList []string, err error) {
return tableList, m.DB.Raw("SELECT name FROM sqlite_master where type=?", "table").Scan(&tableList).Error
}
func (m Migrator) HasColumn(value interface{}, name string) bool {
var count int
m.Migrator.RunWithValue(value, func(stmt *gorm.Statement) error {
if stmt.Schema != nil {
if field := stmt.Schema.LookUpField(name); field != nil {
name = field.DBName
}
}
if name != "" {
m.DB.Raw(
"SELECT count(*) FROM sqlite_master WHERE type = ? AND tbl_name = ? AND (sql LIKE ? OR sql LIKE ? OR sql LIKE ? OR sql LIKE ? OR sql LIKE ?)",
"table", stmt.Table, `%"`+name+`" %`, `%`+name+` %`, "%`"+name+"`%", "%["+name+"]%", "%\t"+name+"\t%",
).Row().Scan(&count)
}
return nil
})
return count > 0
}
func (m Migrator) AlterColumn(value interface{}, name string) error {
return m.RunWithoutForeignKey(func() error {
return m.recreateTable(value, nil, func(ddl *ddl, stmt *gorm.Statement) (*ddl, []interface{}, error) {
if field := stmt.Schema.LookUpField(name); field != nil {
var sqlArgs []interface{}
for i, f := range ddl.fields {
if matches := columnRegexp.FindStringSubmatch(f); len(matches) > 1 && matches[1] == field.DBName {
ddl.fields[i] = fmt.Sprintf("`%v` ?", field.DBName)
sqlArgs = []interface{}{m.FullDataTypeOf(field)}
// table created by old version might look like `CREATE TABLE ? (? varchar(10) UNIQUE)`.
// FullDataTypeOf doesn't contain UNIQUE, so we need to add unique constraint.
if strings.Contains(strings.ToUpper(matches[3]), " UNIQUE") {
uniName := m.DB.NamingStrategy.UniqueName(stmt.Table, field.DBName)
uni, _ := m.GuessConstraintInterfaceAndTable(stmt, uniName)
if uni != nil {
uniSQL, uniArgs := uni.Build()
ddl.addConstraint(uniName, uniSQL)
sqlArgs = append(sqlArgs, uniArgs...)
}
}
break
}
}
return ddl, sqlArgs, nil
}
return nil, nil, fmt.Errorf("failed to alter field with name %v", name)
})
})
}
// ColumnTypes return columnTypes []gorm.ColumnType and execErr error
func (m Migrator) ColumnTypes(value interface{}) ([]gorm.ColumnType, error) {
columnTypes := make([]gorm.ColumnType, 0)
execErr := m.RunWithValue(value, func(stmt *gorm.Statement) (err error) {
var (
sqls []string
sqlDDL *ddl
)
if err := m.DB.Raw("SELECT sql FROM sqlite_master WHERE type IN ? AND tbl_name = ? AND sql IS NOT NULL order by type = ? desc", []string{"table", "index"}, stmt.Table, "table").Scan(&sqls).Error; err != nil {
return err
}
if sqlDDL, err = parseDDL(sqls...); err != nil {
return err
}
rows, err := m.DB.Session(&gorm.Session{}).Table(stmt.Table).Limit(1).Rows()
if err != nil {
return err
}
defer func() {
err = rows.Close()
}()
var rawColumnTypes []*sql.ColumnType
rawColumnTypes, err = rows.ColumnTypes()
if err != nil {
return err
}
for _, c := range rawColumnTypes {
columnType := migrator.ColumnType{SQLColumnType: c}
for _, column := range sqlDDL.columns {
if column.NameValue.String == c.Name() {
column.SQLColumnType = c
columnType = column
break
}
}
columnTypes = append(columnTypes, columnType)
}
return err
})
return columnTypes, execErr
}
func (m Migrator) DropColumn(value interface{}, name string) error {
return m.recreateTable(value, nil, func(ddl *ddl, stmt *gorm.Statement) (*ddl, []interface{}, error) {
if field := stmt.Schema.LookUpField(name); field != nil {
name = field.DBName
}
ddl.removeColumn(name)
return ddl, nil, nil
})
}
func (m Migrator) CreateConstraint(value interface{}, name string) error {
return m.RunWithValue(value, func(stmt *gorm.Statement) error {
constraint, table := m.GuessConstraintInterfaceAndTable(stmt, name)
return m.recreateTable(value, &table,
func(ddl *ddl, stmt *gorm.Statement) (*ddl, []interface{}, error) {
var (
constraintName string
constraintSql string
constraintValues []interface{}
)
if constraint != nil {
constraintName = constraint.GetName()
constraintSql, constraintValues = constraint.Build()
} else {
return nil, nil, nil
}
ddl.addConstraint(constraintName, constraintSql)
return ddl, constraintValues, nil
})
})
}
func (m Migrator) DropConstraint(value interface{}, name string) error {
return m.RunWithValue(value, func(stmt *gorm.Statement) error {
constraint, table := m.GuessConstraintInterfaceAndTable(stmt, name)
if constraint != nil {
name = constraint.GetName()
}
return m.recreateTable(value, &table,
func(ddl *ddl, stmt *gorm.Statement) (*ddl, []interface{}, error) {
ddl.removeConstraint(name)
return ddl, nil, nil
})
})
}
func (m Migrator) HasConstraint(value interface{}, name string) bool {
var count int64
m.RunWithValue(value, func(stmt *gorm.Statement) error {
constraint, table := m.GuessConstraintInterfaceAndTable(stmt, name)
if constraint != nil {
name = constraint.GetName()
}
m.DB.Raw(
"SELECT count(*) FROM sqlite_master WHERE type = ? AND tbl_name = ? AND (sql LIKE ? OR sql LIKE ? OR sql LIKE ? OR sql LIKE ? OR sql LIKE ?)",
"table", table, `%CONSTRAINT "`+name+`" %`, `%CONSTRAINT `+name+` %`, "%CONSTRAINT `"+name+"`%", "%CONSTRAINT ["+name+"]%", "%CONSTRAINT \t"+name+"\t%",
).Row().Scan(&count)
return nil
})
return count > 0
}
func (m Migrator) CurrentDatabase() (name string) {
var null interface{}
m.DB.Raw("PRAGMA database_list").Row().Scan(&null, &name, &null)
return
}
func (m Migrator) BuildIndexOptions(opts []schema.IndexOption, stmt *gorm.Statement) (results []interface{}) {
for _, opt := range opts {
str := stmt.Quote(opt.DBName)
if opt.Expression != "" {
str = opt.Expression
}
if opt.Collate != "" {
str += " COLLATE " + opt.Collate
}
if opt.Sort != "" {
str += " " + opt.Sort
}
results = append(results, clause.Expr{SQL: str})
}
return
}
func (m Migrator) CreateIndex(value interface{}, name string) error {
return m.RunWithValue(value, func(stmt *gorm.Statement) error {
if stmt.Schema != nil {
if idx := stmt.Schema.LookIndex(name); idx != nil {
opts := m.BuildIndexOptions(idx.Fields, stmt)
values := []interface{}{clause.Column{Name: idx.Name}, clause.Table{Name: stmt.Table}, opts}
createIndexSQL := "CREATE "
if idx.Class != "" {
createIndexSQL += idx.Class + " "
}
createIndexSQL += "INDEX ?"
if idx.Type != "" {
createIndexSQL += " USING " + idx.Type
}
createIndexSQL += " ON ??"
if idx.Where != "" {
createIndexSQL += " WHERE " + idx.Where
}
return m.DB.Exec(createIndexSQL, values...).Error
}
}
return fmt.Errorf("failed to create index with name %v", name)
})
}
func (m Migrator) HasIndex(value interface{}, name string) bool {
var count int
m.RunWithValue(value, func(stmt *gorm.Statement) error {
if stmt.Schema != nil {
if idx := stmt.Schema.LookIndex(name); idx != nil {
name = idx.Name
}
}
if name != "" {
m.DB.Raw(
"SELECT count(*) FROM sqlite_master WHERE type = ? AND tbl_name = ? AND name = ?", "index", stmt.Table, name,
).Row().Scan(&count)
}
return nil
})
return count > 0
}
func (m Migrator) RenameIndex(value interface{}, oldName, newName string) error {
return m.RunWithValue(value, func(stmt *gorm.Statement) error {
var sql string
m.DB.Raw("SELECT sql FROM sqlite_master WHERE type = ? AND tbl_name = ? AND name = ?", "index", stmt.Table, oldName).Row().Scan(&sql)
if sql != "" {
if err := m.DropIndex(value, oldName); err != nil {
return err
}
return m.DB.Exec(strings.Replace(sql, oldName, newName, 1)).Error
}
return fmt.Errorf("failed to find index with name %v", oldName)
})
}
func (m Migrator) DropIndex(value interface{}, name string) error {
return m.RunWithValue(value, func(stmt *gorm.Statement) error {
if stmt.Schema != nil {
if idx := stmt.Schema.LookIndex(name); idx != nil {
name = idx.Name
}
}
return m.DB.Exec("DROP INDEX ?", clause.Column{Name: name}).Error
})
}
type Index struct {
Seq int
Name string
Unique bool
Origin string
Partial bool
}
// GetIndexes return Indexes []gorm.Index and execErr error,
// See the [doc]
//
// [doc]: https://www.sqlite.org/pragma.html#pragma_index_list
func (m Migrator) GetIndexes(value interface{}) ([]gorm.Index, error) {
indexes := make([]gorm.Index, 0)
err := m.RunWithValue(value, func(stmt *gorm.Statement) error {
rst := make([]*Index, 0)
if err := m.DB.Debug().Raw("SELECT * FROM PRAGMA_index_list(?)", stmt.Table).Scan(&rst).Error; err != nil { // alias `PRAGMA index_list(?)`
return err
}
for _, index := range rst {
if index.Origin == "u" { // skip the index was created by a UNIQUE constraint
continue
}
var columns []string
if err := m.DB.Raw("SELECT name FROM PRAGMA_index_info(?)", index.Name).Scan(&columns).Error; err != nil { // alias `PRAGMA index_info(?)`
return err
}
indexes = append(indexes, &migrator.Index{
TableName: stmt.Table,
NameValue: index.Name,
ColumnList: columns,
PrimaryKeyValue: sql.NullBool{Bool: index.Origin == "pk", Valid: true}, // The exceptions are INTEGER PRIMARY KEY
UniqueValue: sql.NullBool{Bool: index.Unique, Valid: true},
})
}
return nil
})
return indexes, err
}
func (m Migrator) getRawDDL(table string) (string, error) {
var createSQL string
m.DB.Raw("SELECT sql FROM sqlite_master WHERE type = ? AND tbl_name = ? AND name = ?", "table", table, table).Row().Scan(&createSQL)
if m.DB.Error != nil {
return "", m.DB.Error
}
return createSQL, nil
}
func (m Migrator) recreateTable(
value interface{}, tablePtr *string,
getCreateSQL func(ddl *ddl, stmt *gorm.Statement) (sql *ddl, sqlArgs []interface{}, err error),
) error {
return m.RunWithValue(value, func(stmt *gorm.Statement) error {
table := stmt.Table
if tablePtr != nil {
table = *tablePtr
}
rawDDL, err := m.getRawDDL(table)
if err != nil {
return err
}
originDDL, err := parseDDL(rawDDL)
if err != nil {
return err
}
createDDL, sqlArgs, err := getCreateSQL(originDDL.clone(), stmt)
if err != nil {
return err
}
if createDDL == nil {
return nil
}
newTableName := table + "__temp"
if err := createDDL.renameTable(newTableName, table); err != nil {
return err
}
columns := createDDL.getColumns()
createSQL := createDDL.compile()
return m.DB.Transaction(func(tx *gorm.DB) error {
if err := tx.Exec(createSQL, sqlArgs...).Error; err != nil {
return err
}
queries := []string{
fmt.Sprintf("INSERT INTO `%v`(%v) SELECT %v FROM `%v`", newTableName, strings.Join(columns, ","), strings.Join(columns, ","), table),
fmt.Sprintf("DROP TABLE `%v`", table),
fmt.Sprintf("ALTER TABLE `%v` RENAME TO `%v`", newTableName, table),
}
for _, query := range queries {
if err := tx.Exec(query).Error; err != nil {
return err
}
}
return nil
})
})
}