diff --git a/callbacks.go b/callbacks.go index d1164019..e2907178 100644 --- a/callbacks.go +++ b/callbacks.go @@ -96,6 +96,9 @@ func (p *processor) Execute(db *DB) { db.Logger.Trace(curTime, func() (string, int64) { return db.Dialector.Explain(stmt.SQL.String(), stmt.Vars...), db.RowsAffected }, db.Error) + + stmt.reinit() + db.Config.statementPool.Put(stmt) } } diff --git a/chainable_api.go b/chainable_api.go index 98c1898e..c2a6247b 100644 --- a/chainable_api.go +++ b/chainable_api.go @@ -13,14 +13,14 @@ import ( // db.Model(&User{}).Update("name", "hello") // // if user's primary key is non-blank, will use it as condition, then will only update the user's name to `hello` // db.Model(&user).Update("name", "hello") -func (db *DB) Model(value interface{}) (tx *DB) { +func (db DB) Model(value interface{}) (tx DB) { tx = db.getInstance() tx.Statement.Model = value return } // Clauses Add clauses -func (db *DB) Clauses(conds ...clause.Expression) (tx *DB) { +func (db DB) Clauses(conds ...clause.Expression) (tx DB) { tx = db.getInstance() var whereConds []interface{} @@ -39,14 +39,14 @@ func (db *DB) Clauses(conds ...clause.Expression) (tx *DB) { } // Table specify the table you would like to run db operations -func (db *DB) Table(name string) (tx *DB) { +func (db DB) Table(name string) (tx DB) { tx = db.getInstance() tx.Statement.Table = name return } // Select specify fields that you want when querying, creating, updating -func (db *DB) Select(query interface{}, args ...interface{}) (tx *DB) { +func (db DB) Select(query interface{}, args ...interface{}) (tx DB) { tx = db.getInstance() switch v := query.(type) { @@ -97,7 +97,7 @@ func (db *DB) Select(query interface{}, args ...interface{}) (tx *DB) { } // Omit specify fields that you want to ignore when creating, updating and querying -func (db *DB) Omit(columns ...string) (tx *DB) { +func (db DB) Omit(columns ...string) (tx DB) { tx = db.getInstance() if len(columns) == 1 && strings.ContainsRune(columns[0], ',') { @@ -108,21 +108,21 @@ func (db *DB) Omit(columns ...string) (tx *DB) { return } -func (db *DB) Where(query interface{}, args ...interface{}) (tx *DB) { +func (db DB) Where(query interface{}, args ...interface{}) (tx DB) { tx = db.getInstance() tx.Statement.AddClause(clause.Where{Exprs: tx.Statement.BuildCondtion(query, args...)}) return } // Not add NOT condition -func (db *DB) Not(query interface{}, args ...interface{}) (tx *DB) { +func (db DB) Not(query interface{}, args ...interface{}) (tx DB) { tx = db.getInstance() tx.Statement.AddClause(clause.Where{Exprs: []clause.Expression{clause.Not(tx.Statement.BuildCondtion(query, args...)...)}}) return } // Or add OR conditions -func (db *DB) Or(query interface{}, args ...interface{}) (tx *DB) { +func (db DB) Or(query interface{}, args ...interface{}) (tx DB) { tx = db.getInstance() tx.Statement.AddClause(clause.Where{Exprs: []clause.Expression{clause.Or(tx.Statement.BuildCondtion(query, args...)...)}}) return @@ -131,13 +131,13 @@ func (db *DB) Or(query interface{}, args ...interface{}) (tx *DB) { // Joins specify Joins conditions // db.Joins("Account").Find(&user) // db.Joins("JOIN emails ON emails.user_id = users.id AND emails.email = ?", "jinzhu@example.org").Find(&user) -func (db *DB) Joins(query string, args ...interface{}) (tx *DB) { +func (db DB) Joins(query string, args ...interface{}) (tx DB) { tx = db.getInstance() return } // Group specify the group method on the find -func (db *DB) Group(name string) (tx *DB) { +func (db DB) Group(name string) (tx DB) { tx = db.getInstance() tx.Statement.AddClause(clause.GroupBy{ Columns: []clause.Column{{Name: name}}, @@ -146,7 +146,7 @@ func (db *DB) Group(name string) (tx *DB) { } // Having specify HAVING conditions for GROUP BY -func (db *DB) Having(query interface{}, args ...interface{}) (tx *DB) { +func (db DB) Having(query interface{}, args ...interface{}) (tx DB) { tx = db.getInstance() tx.Statement.AddClause(clause.GroupBy{ Having: tx.Statement.BuildCondtion(query, args...), @@ -157,7 +157,7 @@ func (db *DB) Having(query interface{}, args ...interface{}) (tx *DB) { // Order specify order when retrieve records from database // db.Order("name DESC") // db.Order(gorm.Expr("name = ? DESC", "first")) // sql expression -func (db *DB) Order(value interface{}) (tx *DB) { +func (db DB) Order(value interface{}) (tx DB) { tx = db.getInstance() switch v := value.(type) { @@ -176,20 +176,20 @@ func (db *DB) Order(value interface{}) (tx *DB) { } // Limit specify the number of records to be retrieved -func (db *DB) Limit(limit int) (tx *DB) { +func (db DB) Limit(limit int) (tx DB) { tx = db.getInstance() tx.Statement.AddClause(clause.Limit{Limit: limit}) return } // Offset specify the number of records to skip before starting to return the records -func (db *DB) Offset(offset int) (tx *DB) { +func (db DB) Offset(offset int) (tx DB) { tx = db.getInstance() tx.Statement.AddClause(clause.Limit{Offset: offset}) return } -// Scopes pass current database connection to arguments `func(*DB) *DB`, which could be used to add conditions dynamically +// Scopes pass current database connection to arguments `func(DB) DB`, which could be used to add conditions dynamically // func AmountGreaterThan1000(db *gorm.DB) *gorm.DB { // return db.Where("amount > ?", 1000) // } @@ -201,7 +201,7 @@ func (db *DB) Offset(offset int) (tx *DB) { // } // // db.Scopes(AmountGreaterThan1000, OrderStatus([]string{"paid", "shipped"})).Find(&orders) -func (db *DB) Scopes(funcs ...func(*DB) *DB) *DB { +func (db DB) Scopes(funcs ...func(DB) DB) DB { for _, f := range funcs { db = f(db) } @@ -210,27 +210,27 @@ func (db *DB) Scopes(funcs ...func(*DB) *DB) *DB { // Preload preload associations with given conditions // db.Preload("Orders", "state NOT IN (?)", "cancelled").Find(&users) -func (db *DB) Preload(column string, conditions ...interface{}) (tx *DB) { +func (db DB) Preload(column string, conditions ...interface{}) (tx DB) { tx = db.getInstance() return } -func (db *DB) Assign(attrs ...interface{}) (tx *DB) { +func (db DB) Assign(attrs ...interface{}) (tx DB) { tx = db.getInstance() return } -func (db *DB) Attrs(attrs ...interface{}) (tx *DB) { +func (db DB) Attrs(attrs ...interface{}) (tx DB) { tx = db.getInstance() return } -func (db *DB) Unscoped() (tx *DB) { +func (db DB) Unscoped() (tx DB) { tx = db.getInstance() return } -func (db *DB) Raw(sql string, values ...interface{}) (tx *DB) { +func (db DB) Raw(sql string, values ...interface{}) (tx DB) { tx = db.getInstance() tx.Statement.SQL = strings.Builder{} clause.Expr{SQL: sql, Vars: values}.Build(tx.Statement) diff --git a/dialects/sqlite/sqlite_test.go b/dialects/sqlite/sqlite_test.go index a42bc8ee..7a07db01 100644 --- a/dialects/sqlite/sqlite_test.go +++ b/dialects/sqlite/sqlite_test.go @@ -12,7 +12,7 @@ import ( ) var ( - DB *gorm.DB + DB gorm.DB err error ) @@ -23,9 +23,9 @@ func init() { } func TestCURD(t *testing.T) { - tests.RunTestsSuit(t, DB) + tests.RunTestsSuit(t, &DB) } func TestMigrate(t *testing.T) { - tests.TestMigrate(t, DB) + tests.TestMigrate(t, &DB) } diff --git a/finisher_api.go b/finisher_api.go index 62c1af30..4b3829a2 100644 --- a/finisher_api.go +++ b/finisher_api.go @@ -9,15 +9,15 @@ import ( ) // Create insert the value into database -func (db *DB) Create(value interface{}) (tx *DB) { +func (db DB) Create(value interface{}) (tx DB) { tx = db.getInstance() tx.Statement.Dest = value - tx.callbacks.Create().Execute(tx) + tx.callbacks.Create().Execute(&tx) return } // Save update value in database, if the value doesn't have primary key, will insert it -func (db *DB) Save(value interface{}) (tx *DB) { +func (db DB) Save(value interface{}) (tx DB) { tx = db.getInstance() tx.Statement.Dest = value @@ -26,7 +26,7 @@ func (db *DB) Save(value interface{}) (tx *DB) { reflectValue := reflect.ValueOf(value) for idx, pf := range tx.Statement.Schema.PrimaryFields { if pv, isZero := pf.ValueOf(reflectValue); isZero { - tx.callbacks.Create().Execute(tx) + tx.callbacks.Create().Execute(&tx) where.Exprs[idx] = clause.Eq{Column: pf.DBName, Value: pv} return } @@ -38,12 +38,12 @@ func (db *DB) Save(value interface{}) (tx *DB) { if len(tx.Statement.Selects) == 0 { tx.Statement.Selects = []string{"*"} } - tx.callbacks.Update().Execute(tx) + tx.callbacks.Update().Execute(&tx) return } // First find first record that match given conditions, order by primary key -func (db *DB) First(out interface{}, conds ...interface{}) (tx *DB) { +func (db DB) First(out interface{}, conds ...interface{}) (tx DB) { tx = db.getInstance().Limit(1).Order(clause.OrderByColumn{ Column: clause.Column{Table: clause.CurrentTable, Name: clause.PrimaryKey}, }) @@ -52,24 +52,24 @@ func (db *DB) First(out interface{}, conds ...interface{}) (tx *DB) { } tx.Statement.RaiseErrorOnNotFound = true tx.Statement.Dest = out - tx.callbacks.Query().Execute(tx) + tx.callbacks.Query().Execute(&tx) return } // Take return a record that match given conditions, the order will depend on the database implementation -func (db *DB) Take(out interface{}, conds ...interface{}) (tx *DB) { +func (db DB) Take(out interface{}, conds ...interface{}) (tx DB) { tx = db.getInstance().Limit(1) if len(conds) > 0 { tx.Statement.AddClause(clause.Where{Exprs: tx.Statement.BuildCondtion(conds[0], conds[1:]...)}) } tx.Statement.RaiseErrorOnNotFound = true tx.Statement.Dest = out - tx.callbacks.Query().Execute(tx) + tx.callbacks.Query().Execute(&tx) return } // Last find last record that match given conditions, order by primary key -func (db *DB) Last(out interface{}, conds ...interface{}) (tx *DB) { +func (db DB) Last(out interface{}, conds ...interface{}) (tx DB) { tx = db.getInstance().Limit(1).Order(clause.OrderByColumn{ Column: clause.Column{Table: clause.CurrentTable, Name: clause.PrimaryKey}, Desc: true, @@ -79,101 +79,101 @@ func (db *DB) Last(out interface{}, conds ...interface{}) (tx *DB) { } tx.Statement.RaiseErrorOnNotFound = true tx.Statement.Dest = out - tx.callbacks.Query().Execute(tx) + tx.callbacks.Query().Execute(&tx) return } // Find find records that match given conditions -func (db *DB) Find(out interface{}, conds ...interface{}) (tx *DB) { +func (db DB) Find(out interface{}, conds ...interface{}) (tx DB) { tx = db.getInstance() if len(conds) > 0 { tx.Statement.AddClause(clause.Where{Exprs: tx.Statement.BuildCondtion(conds[0], conds[1:]...)}) } tx.Statement.Dest = out - tx.callbacks.Query().Execute(tx) + tx.callbacks.Query().Execute(&tx) return } -func (db *DB) FirstOrInit(out interface{}, where ...interface{}) (tx *DB) { +func (db DB) FirstOrInit(out interface{}, where ...interface{}) (tx DB) { tx = db.getInstance() return } -func (db *DB) FirstOrCreate(out interface{}, where ...interface{}) (tx *DB) { +func (db DB) FirstOrCreate(out interface{}, where ...interface{}) (tx DB) { tx = db.getInstance() return } // Update update attributes with callbacks, refer: https://jinzhu.github.io/gorm/crud.html#update -func (db *DB) Update(column string, value interface{}) (tx *DB) { +func (db DB) Update(column string, value interface{}) (tx DB) { tx = db.getInstance() tx.Statement.Dest = map[string]interface{}{column: value} - tx.callbacks.Update().Execute(tx) + tx.callbacks.Update().Execute(&tx) return } // Updates update attributes with callbacks, refer: https://jinzhu.github.io/gorm/crud.html#update -func (db *DB) Updates(values interface{}) (tx *DB) { +func (db DB) Updates(values interface{}) (tx DB) { tx = db.getInstance() tx.Statement.Dest = values - tx.callbacks.Update().Execute(tx) + tx.callbacks.Update().Execute(&tx) return } -func (db *DB) UpdateColumn(column string, value interface{}) (tx *DB) { +func (db DB) UpdateColumn(column string, value interface{}) (tx DB) { tx = db.getInstance() tx.Statement.Dest = map[string]interface{}{column: value} - tx.callbacks.Update().Execute(tx) + tx.callbacks.Update().Execute(&tx) return } -func (db *DB) UpdateColumns(values interface{}) (tx *DB) { +func (db DB) UpdateColumns(values interface{}) (tx DB) { tx = db.getInstance() tx.Statement.Dest = values - tx.callbacks.Update().Execute(tx) + tx.callbacks.Update().Execute(&tx) return } // Delete delete value match given conditions, if the value has primary key, then will including the primary key as condition -func (db *DB) Delete(value interface{}, conds ...interface{}) (tx *DB) { +func (db DB) Delete(value interface{}, conds ...interface{}) (tx DB) { tx = db.getInstance() if len(conds) > 0 { tx.Statement.AddClause(clause.Where{Exprs: tx.Statement.BuildCondtion(conds[0], conds[1:]...)}) } tx.Statement.Dest = value - tx.callbacks.Delete().Execute(tx) + tx.callbacks.Delete().Execute(&tx) return } -func (db *DB) Count(value interface{}) (tx *DB) { +func (db DB) Count(value interface{}) (tx DB) { tx = db.getInstance() return } -func (db *DB) Row() *sql.Row { +func (db DB) Row() *sql.Row { tx := db.getInstance() - tx.callbacks.Row().Execute(tx) + tx.callbacks.Row().Execute(&tx) return tx.Statement.Dest.(*sql.Row) } -func (db *DB) Rows() (*sql.Rows, error) { +func (db DB) Rows() (*sql.Rows, error) { tx := db.Set("rows", true) - tx.callbacks.Row().Execute(tx) + tx.callbacks.Row().Execute(&tx) return tx.Statement.Dest.(*sql.Rows), tx.Error } // Scan scan value to a struct -func (db *DB) Scan(dest interface{}) (tx *DB) { +func (db DB) Scan(dest interface{}) (tx DB) { tx = db.getInstance() return } -func (db *DB) ScanRows(rows *sql.Rows, result interface{}) error { +func (db DB) ScanRows(rows *sql.Rows, result interface{}) error { return nil } // Transaction start a transaction as a block, return error will rollback, otherwise to commit. -func (db *DB) Transaction(fc func(tx *DB) error, opts ...*sql.TxOptions) (err error) { +func (db DB) Transaction(fc func(tx DB) error, opts ...*sql.TxOptions) (err error) { panicked := true tx := db.Begin(opts...) defer func() { @@ -194,7 +194,7 @@ func (db *DB) Transaction(fc func(tx *DB) error, opts ...*sql.TxOptions) (err er } // Begin begins a transaction -func (db *DB) Begin(opts ...*sql.TxOptions) (tx *DB) { +func (db DB) Begin(opts ...*sql.TxOptions) (tx DB) { tx = db.getInstance() if beginner, ok := tx.Statement.ConnPool.(TxBeginner); ok { var opt *sql.TxOptions @@ -213,7 +213,7 @@ func (db *DB) Begin(opts ...*sql.TxOptions) (tx *DB) { } // Commit commit a transaction -func (db *DB) Commit() *DB { +func (db DB) Commit() DB { if comminter, ok := db.Statement.ConnPool.(TxCommiter); ok && comminter != nil { db.AddError(comminter.Commit()) } else { @@ -223,7 +223,7 @@ func (db *DB) Commit() *DB { } // Rollback rollback a transaction -func (db *DB) Rollback() *DB { +func (db DB) Rollback() DB { if comminter, ok := db.Statement.ConnPool.(TxCommiter); ok && comminter != nil { db.AddError(comminter.Rollback()) } else { @@ -233,10 +233,10 @@ func (db *DB) Rollback() *DB { } // Exec execute raw sql -func (db *DB) Exec(sql string, values ...interface{}) (tx *DB) { +func (db DB) Exec(sql string, values ...interface{}) (tx DB) { tx = db.getInstance() tx.Statement.SQL = strings.Builder{} clause.Expr{SQL: sql, Vars: values}.Build(tx.Statement) - tx.callbacks.Raw().Execute(tx) + tx.callbacks.Raw().Execute(&tx) return } diff --git a/gorm.go b/gorm.go index b238d572..b7d3e929 100644 --- a/gorm.go +++ b/gorm.go @@ -29,8 +29,9 @@ type Config struct { // Dialector database dialector Dialector - callbacks *callbacks - cacheStore *sync.Map + statementPool sync.Pool + callbacks *callbacks + cacheStore *sync.Map } // DB GORM DB definition @@ -50,7 +51,7 @@ type Session struct { } // Open initialize db session based on dialector -func Open(dialector Dialector, config *Config) (db *DB, err error) { +func Open(dialector Dialector, config *Config) (db DB, err error) { if config == nil { config = &Config{} } @@ -75,21 +76,32 @@ func Open(dialector Dialector, config *Config) (db *DB, err error) { config.cacheStore = &sync.Map{} } - db = &DB{ + config.statementPool = sync.Pool{ + New: func() interface{} { + return &Statement{ + DB: db, + ConnPool: db.ConnPool, + Clauses: map[string]clause.Clause{}, + Context: context.Background(), + } + }, + } + + db = DB{ Config: config, clone: true, } - db.callbacks = initializeCallbacks(db) + db.callbacks = initializeCallbacks(&db) if dialector != nil { - err = dialector.Initialize(db) + err = dialector.Initialize(&db) } return } // Session create new db session -func (db *DB) Session(config *Session) *DB { +func (db DB) Session(config *Session) DB { var ( tx = db.getInstance() txConfig = *tx.Config @@ -113,24 +125,24 @@ func (db *DB) Session(config *Session) *DB { } // WithContext change current instance db's context to ctx -func (db *DB) WithContext(ctx context.Context) *DB { +func (db DB) WithContext(ctx context.Context) DB { return db.Session(&Session{Context: ctx}) } // Debug start debug mode -func (db *DB) Debug() (tx *DB) { +func (db DB) Debug() (tx DB) { return db.Session(&Session{Logger: db.Logger.LogMode(logger.Info)}) } // Set store value with key into current db instance's context -func (db *DB) Set(key string, value interface{}) *DB { +func (db DB) Set(key string, value interface{}) DB { tx := db.getInstance() tx.Statement.Settings.Store(key, value) return tx } // Get get value with key from current db instance's context -func (db *DB) Get(key string) (interface{}, bool) { +func (db DB) Get(key string) (interface{}, bool) { if db.Statement != nil { return db.Statement.Settings.Load(key) } @@ -138,36 +150,28 @@ func (db *DB) Get(key string) (interface{}, bool) { } // Callback returns callback manager -func (db *DB) Callback() *callbacks { +func (db DB) Callback() *callbacks { return db.callbacks } // AutoMigrate run auto migration for given models -func (db *DB) AutoMigrate(dst ...interface{}) error { +func (db DB) AutoMigrate(dst ...interface{}) error { return db.Migrator().AutoMigrate(dst...) } // AddError add error to db -func (db *DB) AddError(err error) { +func (db DB) AddError(err error) { db.Statement.AddError(err) } -func (db *DB) getInstance() *DB { +func (db DB) getInstance() DB { if db.clone { - ctx := context.Background() + stmt := db.Config.statementPool.Get().(*Statement) if db.Statement != nil { - ctx = db.Statement.Context + stmt.Context = db.Statement.Context } - return &DB{ - Config: db.Config, - Statement: &Statement{ - DB: db, - ConnPool: db.ConnPool, - Clauses: map[string]clause.Clause{}, - Context: ctx, - }, - } + return DB{Config: db.Config, Statement: stmt} } return db diff --git a/migrator/migrator.go b/migrator/migrator.go index 730e8cfe..b2458bfc 100644 --- a/migrator/migrator.go +++ b/migrator/migrator.go @@ -27,7 +27,7 @@ type Config struct { func (m Migrator) RunWithValue(value interface{}, fc func(*gorm.Statement) error) error { stmt := m.DB.Statement if stmt == nil { - stmt = &gorm.Statement{DB: m.DB} + stmt = &gorm.Statement{DB: *m.DB} } if err := stmt.Parse(value); err != nil { @@ -496,7 +496,7 @@ func (m Migrator) ReorderModels(values []interface{}, autoAdd bool) (results []i parseDependence := func(value interface{}, addToList bool) { dep := Dependency{ - Statement: &gorm.Statement{DB: m.DB, Dest: value}, + Statement: &gorm.Statement{DB: *m.DB, Dest: value}, } dep.Parse(value) diff --git a/statement.go b/statement.go index 10b62567..0190df7c 100644 --- a/statement.go +++ b/statement.go @@ -25,17 +25,16 @@ type Statement struct { Omits []string // omit columns Settings sync.Map ConnPool ConnPool - DB *DB + DB DB Schema *schema.Schema Context context.Context Error error RowsAffected int64 RaiseErrorOnNotFound bool - - // SQL Builder - SQL strings.Builder - Vars []interface{} - NamedVars []sql.NamedArg + SQL strings.Builder + Vars []interface{} + NamedVars []sql.NamedArg + placeholders strings.Builder } // StatementOptimizer statement optimizer interface @@ -112,41 +111,43 @@ func (stmt Statement) Quote(field interface{}) string { // Write write string func (stmt *Statement) AddVar(vars ...interface{}) string { - var placeholders strings.Builder + stmt.placeholders = strings.Builder{} + stmt.placeholders.Reset() + for idx, v := range vars { if idx > 0 { - placeholders.WriteByte(',') + stmt.placeholders.WriteByte(',') } switch v := v.(type) { case sql.NamedArg: if len(v.Name) > 0 { stmt.NamedVars = append(stmt.NamedVars, v) - placeholders.WriteByte('@') - placeholders.WriteString(v.Name) + stmt.placeholders.WriteByte('@') + stmt.placeholders.WriteString(v.Name) } else { stmt.Vars = append(stmt.Vars, v.Value) - placeholders.WriteString(stmt.DB.Dialector.BindVar(stmt, v.Value)) + stmt.placeholders.WriteString(stmt.DB.Dialector.BindVar(stmt, v.Value)) } case clause.Column, clause.Table: - placeholders.WriteString(stmt.Quote(v)) + stmt.placeholders.WriteString(stmt.Quote(v)) case clause.Expr: - placeholders.WriteString(v.SQL) + stmt.placeholders.WriteString(v.SQL) stmt.Vars = append(stmt.Vars, v.Vars...) case []interface{}: if len(v) > 0 { - placeholders.WriteByte('(') - placeholders.WriteString(stmt.AddVar(v...)) - placeholders.WriteByte(')') + stmt.placeholders.WriteByte('(') + stmt.placeholders.WriteString(stmt.AddVar(v...)) + stmt.placeholders.WriteByte(')') } else { - placeholders.WriteString("(NULL)") + stmt.placeholders.WriteString("(NULL)") } default: stmt.Vars = append(stmt.Vars, v) - placeholders.WriteString(stmt.DB.Dialector.BindVar(stmt, v)) + stmt.placeholders.WriteString(stmt.DB.Dialector.BindVar(stmt, v)) } } - return placeholders.String() + return stmt.placeholders.String() } // AddClause add clause @@ -261,3 +262,29 @@ func (stmt *Statement) Parse(value interface{}) (err error) { } return err } + +func (stmt *Statement) reinit() { + stmt.Table = "" + stmt.Model = nil + stmt.Selects = nil + stmt.Omits = nil + stmt.ConnPool = stmt.DB.Config.ConnPool + stmt.Schema = nil + stmt.Context = context.Background() + stmt.Error = nil + stmt.RowsAffected = 0 + stmt.RaiseErrorOnNotFound = false + + stmt.SQL.Reset() + stmt.Vars = nil + stmt.NamedVars = nil + + for k := range stmt.Clauses { + delete(stmt.Clauses, k) + } + + stmt.Settings.Range(func(k, _ interface{}) bool { + stmt.Settings.Delete(k) + return true + }) +}