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finisher_api.go
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finisher_api.go
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package gorm
import (
"database/sql"
"errors"
"fmt"
"reflect"
"strings"
"gorm.io/gorm/clause"
"gorm.io/gorm/logger"
"gorm.io/gorm/schema"
"gorm.io/gorm/utils"
)
// Create insert the value into database
func (db *DB) Create(value interface{}) (tx *DB) {
if db.CreateBatchSize > 0 {
return db.CreateInBatches(value, db.CreateBatchSize)
}
tx = db.getInstance()
tx.Statement.Dest = value
return tx.callbacks.Create().Execute(tx)
}
// CreateInBatches insert the value in batches into database
func (db *DB) CreateInBatches(value interface{}, batchSize int) (tx *DB) {
reflectValue := reflect.Indirect(reflect.ValueOf(value))
switch reflectValue.Kind() {
case reflect.Slice, reflect.Array:
var rowsAffected int64
tx = db.getInstance()
callFc := func(tx *DB) error {
// the reflection length judgment of the optimized value
reflectLen := reflectValue.Len()
for i := 0; i < reflectLen; i += batchSize {
ends := i + batchSize
if ends > reflectLen {
ends = reflectLen
}
subtx := tx.getInstance()
subtx.Statement.Dest = reflectValue.Slice(i, ends).Interface()
subtx.callbacks.Create().Execute(subtx)
if subtx.Error != nil {
return subtx.Error
}
rowsAffected += subtx.RowsAffected
}
return nil
}
if tx.SkipDefaultTransaction {
tx.AddError(callFc(tx.Session(&Session{})))
} else {
tx.AddError(tx.Transaction(callFc))
}
tx.RowsAffected = rowsAffected
default:
tx = db.getInstance()
tx.Statement.Dest = value
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) {
tx = db.getInstance()
tx.Statement.Dest = value
reflectValue := reflect.Indirect(reflect.ValueOf(value))
for reflectValue.Kind() == reflect.Ptr || reflectValue.Kind() == reflect.Interface {
reflectValue = reflect.Indirect(reflectValue)
}
switch reflectValue.Kind() {
case reflect.Slice, reflect.Array:
if _, ok := tx.Statement.Clauses["ON CONFLICT"]; !ok {
tx = tx.Clauses(clause.OnConflict{UpdateAll: true})
}
tx = tx.callbacks.Create().Execute(tx.Set("gorm:update_track_time", true))
case reflect.Struct:
if err := tx.Statement.Parse(value); err == nil && tx.Statement.Schema != nil {
for _, pf := range tx.Statement.Schema.PrimaryFields {
if _, isZero := pf.ValueOf(tx.Statement.Context, reflectValue); isZero {
return tx.callbacks.Create().Execute(tx)
}
}
}
fallthrough
default:
selectedUpdate := len(tx.Statement.Selects) != 0
// when updating, use all fields including those zero-value fields
if !selectedUpdate {
tx.Statement.Selects = append(tx.Statement.Selects, "*")
}
tx = tx.callbacks.Update().Execute(tx)
if tx.Error == nil && tx.RowsAffected == 0 && !tx.DryRun && !selectedUpdate {
result := reflect.New(tx.Statement.Schema.ModelType).Interface()
if result := tx.Session(&Session{}).Limit(1).Find(result); result.RowsAffected == 0 {
return tx.Create(value)
}
}
}
return
}
// First find first record that match given conditions, order by primary key
func (db *DB) First(dest interface{}, conds ...interface{}) (tx *DB) {
tx = db.Limit(1).Order(clause.OrderByColumn{
Column: clause.Column{Table: clause.CurrentTable, Name: clause.PrimaryKey},
})
if len(conds) > 0 {
if exprs := tx.Statement.BuildCondition(conds[0], conds[1:]...); len(exprs) > 0 {
tx.Statement.AddClause(clause.Where{Exprs: exprs})
}
}
tx.Statement.RaiseErrorOnNotFound = true
tx.Statement.Dest = dest
return tx.callbacks.Query().Execute(tx)
}
// Take return a record that match given conditions, the order will depend on the database implementation
func (db *DB) Take(dest interface{}, conds ...interface{}) (tx *DB) {
tx = db.Limit(1)
if len(conds) > 0 {
if exprs := tx.Statement.BuildCondition(conds[0], conds[1:]...); len(exprs) > 0 {
tx.Statement.AddClause(clause.Where{Exprs: exprs})
}
}
tx.Statement.RaiseErrorOnNotFound = true
tx.Statement.Dest = dest
return tx.callbacks.Query().Execute(tx)
}
// Last find last record that match given conditions, order by primary key
func (db *DB) Last(dest interface{}, conds ...interface{}) (tx *DB) {
tx = db.Limit(1).Order(clause.OrderByColumn{
Column: clause.Column{Table: clause.CurrentTable, Name: clause.PrimaryKey},
Desc: true,
})
if len(conds) > 0 {
if exprs := tx.Statement.BuildCondition(conds[0], conds[1:]...); len(exprs) > 0 {
tx.Statement.AddClause(clause.Where{Exprs: exprs})
}
}
tx.Statement.RaiseErrorOnNotFound = true
tx.Statement.Dest = dest
return tx.callbacks.Query().Execute(tx)
}
// Find find records that match given conditions
func (db *DB) Find(dest interface{}, conds ...interface{}) (tx *DB) {
tx = db.getInstance()
if len(conds) > 0 {
if exprs := tx.Statement.BuildCondition(conds[0], conds[1:]...); len(exprs) > 0 {
tx.Statement.AddClause(clause.Where{Exprs: exprs})
}
}
tx.Statement.Dest = dest
return tx.callbacks.Query().Execute(tx)
}
// FindInBatches find records in batches
func (db *DB) FindInBatches(dest interface{}, batchSize int, fc func(tx *DB, batch int) error) *DB {
var (
tx = db.Order(clause.OrderByColumn{
Column: clause.Column{Table: clause.CurrentTable, Name: clause.PrimaryKey},
}).Session(&Session{})
queryDB = tx
rowsAffected int64
batch int
)
// user specified offset or limit
var totalSize int
if c, ok := tx.Statement.Clauses["LIMIT"]; ok {
if limit, ok := c.Expression.(clause.Limit); ok {
totalSize = limit.Limit
if totalSize > 0 && batchSize > totalSize {
batchSize = totalSize
}
// reset to offset to 0 in next batch
tx = tx.Offset(-1).Session(&Session{})
}
}
for {
result := queryDB.Limit(batchSize).Find(dest)
rowsAffected += result.RowsAffected
batch++
if result.Error == nil && result.RowsAffected != 0 {
tx.AddError(fc(result, batch))
} else if result.Error != nil {
tx.AddError(result.Error)
}
if tx.Error != nil || int(result.RowsAffected) < batchSize {
break
}
if totalSize > 0 {
if totalSize <= int(rowsAffected) {
break
}
if totalSize/batchSize == batch {
batchSize = totalSize % batchSize
}
}
// Optimize for-break
resultsValue := reflect.Indirect(reflect.ValueOf(dest))
if result.Statement.Schema.PrioritizedPrimaryField == nil {
tx.AddError(ErrPrimaryKeyRequired)
break
}
primaryValue, _ := result.Statement.Schema.PrioritizedPrimaryField.ValueOf(tx.Statement.Context, resultsValue.Index(resultsValue.Len()-1))
queryDB = tx.Clauses(clause.Gt{Column: clause.Column{Table: clause.CurrentTable, Name: clause.PrimaryKey}, Value: primaryValue})
}
tx.RowsAffected = rowsAffected
return tx
}
func (db *DB) assignInterfacesToValue(values ...interface{}) {
for _, value := range values {
switch v := value.(type) {
case []clause.Expression:
for _, expr := range v {
if eq, ok := expr.(clause.Eq); ok {
switch column := eq.Column.(type) {
case string:
if field := db.Statement.Schema.LookUpField(column); field != nil {
db.AddError(field.Set(db.Statement.Context, db.Statement.ReflectValue, eq.Value))
}
case clause.Column:
if field := db.Statement.Schema.LookUpField(column.Name); field != nil {
db.AddError(field.Set(db.Statement.Context, db.Statement.ReflectValue, eq.Value))
}
}
} else if andCond, ok := expr.(clause.AndConditions); ok {
db.assignInterfacesToValue(andCond.Exprs)
}
}
case clause.Expression, map[string]string, map[interface{}]interface{}, map[string]interface{}:
if exprs := db.Statement.BuildCondition(value); len(exprs) > 0 {
db.assignInterfacesToValue(exprs)
}
default:
if s, err := schema.Parse(value, db.cacheStore, db.NamingStrategy); err == nil {
reflectValue := reflect.Indirect(reflect.ValueOf(value))
switch reflectValue.Kind() {
case reflect.Struct:
for _, f := range s.Fields {
if f.Readable {
if v, isZero := f.ValueOf(db.Statement.Context, reflectValue); !isZero {
if field := db.Statement.Schema.LookUpField(f.Name); field != nil {
db.AddError(field.Set(db.Statement.Context, db.Statement.ReflectValue, v))
}
}
}
}
}
} else if len(values) > 0 {
if exprs := db.Statement.BuildCondition(values[0], values[1:]...); len(exprs) > 0 {
db.assignInterfacesToValue(exprs)
}
return
}
}
}
}
// FirstOrInit gets the first matched record or initialize a new instance with given conditions (only works with struct or map conditions)
func (db *DB) FirstOrInit(dest interface{}, conds ...interface{}) (tx *DB) {
queryTx := db.Limit(1).Order(clause.OrderByColumn{
Column: clause.Column{Table: clause.CurrentTable, Name: clause.PrimaryKey},
})
if tx = queryTx.Find(dest, conds...); queryTx.RowsAffected == 0 {
if c, ok := tx.Statement.Clauses["WHERE"]; ok {
if where, ok := c.Expression.(clause.Where); ok {
tx.assignInterfacesToValue(where.Exprs)
}
}
// initialize with attrs, conds
if len(tx.Statement.attrs) > 0 {
tx.assignInterfacesToValue(tx.Statement.attrs...)
}
}
// initialize with attrs, conds
if len(tx.Statement.assigns) > 0 {
tx.assignInterfacesToValue(tx.Statement.assigns...)
}
return
}
// FirstOrCreate gets the first matched record or create a new one with given conditions (only works with struct, map conditions)
func (db *DB) FirstOrCreate(dest interface{}, conds ...interface{}) (tx *DB) {
queryTx := db.Limit(1).Order(clause.OrderByColumn{
Column: clause.Column{Table: clause.CurrentTable, Name: clause.PrimaryKey},
})
if tx = queryTx.Find(dest, conds...); tx.Error == nil {
if tx.RowsAffected == 0 {
if c, ok := tx.Statement.Clauses["WHERE"]; ok {
if where, ok := c.Expression.(clause.Where); ok {
tx.assignInterfacesToValue(where.Exprs)
}
}
// initialize with attrs, conds
if len(tx.Statement.attrs) > 0 {
tx.assignInterfacesToValue(tx.Statement.attrs...)
}
// initialize with attrs, conds
if len(tx.Statement.assigns) > 0 {
tx.assignInterfacesToValue(tx.Statement.assigns...)
}
return tx.Create(dest)
} else if len(db.Statement.assigns) > 0 {
exprs := tx.Statement.BuildCondition(db.Statement.assigns[0], db.Statement.assigns[1:]...)
assigns := map[string]interface{}{}
for _, expr := range exprs {
if eq, ok := expr.(clause.Eq); ok {
switch column := eq.Column.(type) {
case string:
assigns[column] = eq.Value
case clause.Column:
assigns[column.Name] = eq.Value
default:
}
}
}
return tx.Model(dest).Updates(assigns)
} else {
// can not use Find RowsAffected
tx.RowsAffected = 0
}
}
return tx
}
// Update update attributes with callbacks, refer: https://gorm.io/docs/update.html#Update-Changed-Fields
func (db *DB) Update(column string, value interface{}) (tx *DB) {
tx = db.getInstance()
tx.Statement.Dest = map[string]interface{}{column: value}
return tx.callbacks.Update().Execute(tx)
}
// Updates update attributes with callbacks, refer: https://gorm.io/docs/update.html#Update-Changed-Fields
func (db *DB) Updates(values interface{}) (tx *DB) {
tx = db.getInstance()
tx.Statement.Dest = values
return tx.callbacks.Update().Execute(tx)
}
func (db *DB) UpdateColumn(column string, value interface{}) (tx *DB) {
tx = db.getInstance()
tx.Statement.Dest = map[string]interface{}{column: value}
tx.Statement.SkipHooks = true
return tx.callbacks.Update().Execute(tx)
}
func (db *DB) UpdateColumns(values interface{}) (tx *DB) {
tx = db.getInstance()
tx.Statement.Dest = values
tx.Statement.SkipHooks = true
return tx.callbacks.Update().Execute(tx)
}
// 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) {
tx = db.getInstance()
if len(conds) > 0 {
if exprs := tx.Statement.BuildCondition(conds[0], conds[1:]...); len(exprs) > 0 {
tx.Statement.AddClause(clause.Where{Exprs: exprs})
}
}
tx.Statement.Dest = value
return tx.callbacks.Delete().Execute(tx)
}
func (db *DB) Count(count *int64) (tx *DB) {
tx = db.getInstance()
if tx.Statement.Model == nil {
tx.Statement.Model = tx.Statement.Dest
defer func() {
tx.Statement.Model = nil
}()
}
if selectClause, ok := db.Statement.Clauses["SELECT"]; ok {
defer func() {
tx.Statement.Clauses["SELECT"] = selectClause
}()
} else {
defer delete(tx.Statement.Clauses, "SELECT")
}
if len(tx.Statement.Selects) == 0 {
tx.Statement.AddClause(clause.Select{Expression: clause.Expr{SQL: "count(*)"}})
} else if !strings.HasPrefix(strings.TrimSpace(strings.ToLower(tx.Statement.Selects[0])), "count(") {
expr := clause.Expr{SQL: "count(*)"}
if len(tx.Statement.Selects) == 1 {
dbName := tx.Statement.Selects[0]
fields := strings.FieldsFunc(dbName, utils.IsValidDBNameChar)
if len(fields) == 1 || (len(fields) == 3 && (strings.ToUpper(fields[1]) == "AS" || fields[1] == ".")) {
if tx.Statement.Parse(tx.Statement.Model) == nil {
if f := tx.Statement.Schema.LookUpField(dbName); f != nil {
dbName = f.DBName
}
}
if tx.Statement.Distinct {
expr = clause.Expr{SQL: "COUNT(DISTINCT(?))", Vars: []interface{}{clause.Column{Name: dbName}}}
} else if dbName != "*" {
expr = clause.Expr{SQL: "COUNT(?)", Vars: []interface{}{clause.Column{Name: dbName}}}
}
}
}
tx.Statement.AddClause(clause.Select{Expression: expr})
}
if orderByClause, ok := db.Statement.Clauses["ORDER BY"]; ok {
if _, ok := db.Statement.Clauses["GROUP BY"]; !ok {
delete(tx.Statement.Clauses, "ORDER BY")
defer func() {
tx.Statement.Clauses["ORDER BY"] = orderByClause
}()
}
}
tx.Statement.Dest = count
tx = tx.callbacks.Query().Execute(tx)
if _, ok := db.Statement.Clauses["GROUP BY"]; ok || tx.RowsAffected != 1 {
*count = tx.RowsAffected
}
return
}
func (db *DB) Row() *sql.Row {
tx := db.getInstance().Set("rows", false)
tx = tx.callbacks.Row().Execute(tx)
row, ok := tx.Statement.Dest.(*sql.Row)
if !ok && tx.DryRun {
db.Logger.Error(tx.Statement.Context, ErrDryRunModeUnsupported.Error())
}
return row
}
func (db *DB) Rows() (*sql.Rows, error) {
tx := db.getInstance().Set("rows", true)
tx = tx.callbacks.Row().Execute(tx)
rows, ok := tx.Statement.Dest.(*sql.Rows)
if !ok && tx.DryRun && tx.Error == nil {
tx.Error = ErrDryRunModeUnsupported
}
return rows, tx.Error
}
// Scan scan value to a struct
func (db *DB) Scan(dest interface{}) (tx *DB) {
config := *db.Config
currentLogger, newLogger := config.Logger, logger.Recorder.New()
config.Logger = newLogger
tx = db.getInstance()
tx.Config = &config
if rows, err := tx.Rows(); err == nil {
if rows.Next() {
tx.ScanRows(rows, dest)
} else {
tx.RowsAffected = 0
}
tx.AddError(rows.Close())
}
currentLogger.Trace(tx.Statement.Context, newLogger.BeginAt, func() (string, int64) {
return newLogger.SQL, tx.RowsAffected
}, tx.Error)
tx.Logger = currentLogger
return
}
// Pluck used to query single column from a model as a map
// var ages []int64
// db.Model(&users).Pluck("age", &ages)
func (db *DB) Pluck(column string, dest interface{}) (tx *DB) {
tx = db.getInstance()
if tx.Statement.Model != nil {
if tx.Statement.Parse(tx.Statement.Model) == nil {
if f := tx.Statement.Schema.LookUpField(column); f != nil {
column = f.DBName
}
}
}
if len(tx.Statement.Selects) != 1 {
fields := strings.FieldsFunc(column, utils.IsValidDBNameChar)
tx.Statement.AddClauseIfNotExists(clause.Select{
Distinct: tx.Statement.Distinct,
Columns: []clause.Column{{Name: column, Raw: len(fields) != 1}},
})
}
tx.Statement.Dest = dest
return tx.callbacks.Query().Execute(tx)
}
func (db *DB) ScanRows(rows *sql.Rows, dest interface{}) error {
tx := db.getInstance()
if err := tx.Statement.Parse(dest); !errors.Is(err, schema.ErrUnsupportedDataType) {
tx.AddError(err)
}
tx.Statement.Dest = dest
tx.Statement.ReflectValue = reflect.ValueOf(dest)
for tx.Statement.ReflectValue.Kind() == reflect.Ptr {
elem := tx.Statement.ReflectValue.Elem()
if !elem.IsValid() {
elem = reflect.New(tx.Statement.ReflectValue.Type().Elem())
tx.Statement.ReflectValue.Set(elem)
}
tx.Statement.ReflectValue = elem
}
Scan(rows, tx, ScanInitialized)
return tx.Error
}
// Connection use a db conn to execute Multiple commands,this conn will put conn pool after it is executed.
func (db *DB) Connection(fc func(tx *DB) error) (err error) {
if db.Error != nil {
return db.Error
}
tx := db.getInstance()
sqlDB, err := tx.DB()
if err != nil {
return
}
conn, err := sqlDB.Conn(tx.Statement.Context)
if err != nil {
return
}
defer conn.Close()
tx.Statement.ConnPool = conn
return fc(tx)
}
// 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) {
panicked := true
if committer, ok := db.Statement.ConnPool.(TxCommitter); ok && committer != nil {
// nested transaction
if !db.DisableNestedTransaction {
err = db.SavePoint(fmt.Sprintf("sp%p", fc)).Error
if err != nil {
return
}
defer func() {
// Make sure to rollback when panic, Block error or Commit error
if panicked || err != nil {
db.RollbackTo(fmt.Sprintf("sp%p", fc))
}
}()
}
err = fc(db.Session(&Session{}))
} else {
tx := db.Begin(opts...)
if tx.Error != nil {
return tx.Error
}
defer func() {
// Make sure to rollback when panic, Block error or Commit error
if panicked || err != nil {
tx.Rollback()
}
}()
if err = fc(tx); err == nil {
panicked = false
return tx.Commit().Error
}
}
panicked = false
return
}
// Begin begins a transaction
func (db *DB) Begin(opts ...*sql.TxOptions) *DB {
var (
// clone statement
tx = db.getInstance().Session(&Session{Context: db.Statement.Context, NewDB: db.clone == 1})
opt *sql.TxOptions
err error
)
if len(opts) > 0 {
opt = opts[0]
}
switch beginner := tx.Statement.ConnPool.(type) {
case TxBeginner:
tx.Statement.ConnPool, err = beginner.BeginTx(tx.Statement.Context, opt)
case ConnPoolBeginner:
tx.Statement.ConnPool, err = beginner.BeginTx(tx.Statement.Context, opt)
default:
err = ErrInvalidTransaction
}
if err != nil {
tx.AddError(err)
}
return tx
}
// Commit commit a transaction
func (db *DB) Commit() *DB {
if committer, ok := db.Statement.ConnPool.(TxCommitter); ok && committer != nil && !reflect.ValueOf(committer).IsNil() {
db.AddError(committer.Commit())
} else {
db.AddError(ErrInvalidTransaction)
}
return db
}
// Rollback rollback a transaction
func (db *DB) Rollback() *DB {
if committer, ok := db.Statement.ConnPool.(TxCommitter); ok && committer != nil {
if !reflect.ValueOf(committer).IsNil() {
db.AddError(committer.Rollback())
}
} else {
db.AddError(ErrInvalidTransaction)
}
return db
}
func (db *DB) SavePoint(name string) *DB {
if savePointer, ok := db.Dialector.(SavePointerDialectorInterface); ok {
db.AddError(savePointer.SavePoint(db, name))
} else {
db.AddError(ErrUnsupportedDriver)
}
return db
}
func (db *DB) RollbackTo(name string) *DB {
if savePointer, ok := db.Dialector.(SavePointerDialectorInterface); ok {
db.AddError(savePointer.RollbackTo(db, name))
} else {
db.AddError(ErrUnsupportedDriver)
}
return db
}
// Exec execute raw sql
func (db *DB) Exec(sql string, values ...interface{}) (tx *DB) {
tx = db.getInstance()
tx.Statement.SQL = strings.Builder{}
if strings.Contains(sql, "@") {
clause.NamedExpr{SQL: sql, Vars: values}.Build(tx.Statement)
} else {
clause.Expr{SQL: sql, Vars: values}.Build(tx.Statement)
}
return tx.callbacks.Raw().Execute(tx)
}