Allow customize clauses

callbacks.go

@@ -32,6 +32,7 @@ type callbacks struct {
 
 type processor struct {
 	db        *DB
+	Clauses   []string
 	fns       []func(*DB)
 	callbacks []*callback
 }
@@ -84,8 +85,14 @@ func (p *processor) Execute(db *DB) {
 	var (
 		curTime           = time.Now()
 		stmt              = db.Statement
+		resetBuildClauses bool
 	)
 
+	if len(stmt.BuildClauses) == 0 {
+		stmt.BuildClauses = p.Clauses
+		resetBuildClauses = true
+	}
+
 	// assign model values
 	if stmt.Model == nil {
 		stmt.Model = stmt.Dest
@@ -131,6 +138,10 @@ func (p *processor) Execute(db *DB) {
 		stmt.SQL.Reset()
 		stmt.Vars = nil
 	}
+
+	if resetBuildClauses {
+		stmt.BuildClauses = nil
+	}
 }
 
 func (p *processor) Get(name string) func(*DB) {

callbacks/callbacks.go

@@ -4,9 +4,20 @@ import (
 	"gorm.io/gorm"
 )
 
+var (
+	createClauses = []string{"INSERT", "VALUES", "ON CONFLICT"}
+	queryClauses  = []string{"SELECT", "FROM", "WHERE", "GROUP BY", "ORDER BY", "LIMIT", "FOR"}
+	updateClauses = []string{"UPDATE", "SET", "WHERE"}
+	deleteClauses = []string{"DELETE", "FROM", "WHERE"}
+)
+
 type Config struct {
 	LastInsertIDReversed bool
 	WithReturning        bool
+	CreateClauses        []string
+	QueryClauses         []string
+	UpdateClauses        []string
+	DeleteClauses        []string
 }
 
 func RegisterDefaultCallbacks(db *gorm.DB, config *Config) {
@@ -22,11 +33,19 @@ func RegisterDefaultCallbacks(db *gorm.DB, config *Config) {
 	createCallback.Register("gorm:save_after_associations", SaveAfterAssociations(true))
 	createCallback.Register("gorm:after_create", AfterCreate)
 	createCallback.Match(enableTransaction).Register("gorm:commit_or_rollback_transaction", CommitOrRollbackTransaction)
+	if len(config.CreateClauses) == 0 {
+		config.CreateClauses = createClauses
+	}
+	createCallback.Clauses = config.CreateClauses
 
 	queryCallback := db.Callback().Query()
 	queryCallback.Register("gorm:query", Query)
 	queryCallback.Register("gorm:preload", Preload)
 	queryCallback.Register("gorm:after_query", AfterQuery)
+	if len(config.QueryClauses) == 0 {
+		config.QueryClauses = queryClauses
+	}
+	queryCallback.Clauses = config.QueryClauses
 
 	deleteCallback := db.Callback().Delete()
 	deleteCallback.Match(enableTransaction).Register("gorm:begin_transaction", BeginTransaction)
@@ -35,6 +54,10 @@ func RegisterDefaultCallbacks(db *gorm.DB, config *Config) {
 	deleteCallback.Register("gorm:delete", Delete)
 	deleteCallback.Register("gorm:after_delete", AfterDelete)
 	deleteCallback.Match(enableTransaction).Register("gorm:commit_or_rollback_transaction", CommitOrRollbackTransaction)
+	if len(config.DeleteClauses) == 0 {
+		config.DeleteClauses = deleteClauses
+	}
+	deleteCallback.Clauses = config.DeleteClauses
 
 	updateCallback := db.Callback().Update()
 	updateCallback.Match(enableTransaction).Register("gorm:begin_transaction", BeginTransaction)
@@ -45,7 +68,16 @@ func RegisterDefaultCallbacks(db *gorm.DB, config *Config) {
 	updateCallback.Register("gorm:save_after_associations", SaveAfterAssociations(false))
 	updateCallback.Register("gorm:after_update", AfterUpdate)
 	updateCallback.Match(enableTransaction).Register("gorm:commit_or_rollback_transaction", CommitOrRollbackTransaction)
+	if len(config.UpdateClauses) == 0 {
+		config.UpdateClauses = updateClauses
+	}
+	updateCallback.Clauses = config.UpdateClauses
 
-	db.Callback().Row().Register("gorm:row", RowQuery)
+	rowCallback := db.Callback().Row()
-	db.Callback().Raw().Register("gorm:raw", RawExec)
+	rowCallback.Register("gorm:row", RowQuery)
+	rowCallback.Clauses = config.QueryClauses
+
+	rawCallback := db.Callback().Raw()
+	rawCallback.Register("gorm:raw", RawExec)
+	rawCallback.Clauses = config.QueryClauses
 }

callbacks/create.go

@@ -47,7 +47,7 @@ func Create(config *Config) func(db *gorm.DB) {
 					db.Statement.AddClauseIfNotExists(clause.Insert{})
 					db.Statement.AddClause(ConvertToCreateValues(db.Statement))
 
-					db.Statement.Build("INSERT", "VALUES", "ON CONFLICT")
+					db.Statement.Build(db.Statement.BuildClauses...)
 				}
 
 				if !db.DryRun && db.Error == nil {
@@ -118,7 +118,7 @@ func CreateWithReturning(db *gorm.DB) {
 			db.Statement.AddClauseIfNotExists(clause.Insert{})
 			db.Statement.AddClause(ConvertToCreateValues(db.Statement))
 
-			db.Statement.Build("INSERT", "VALUES", "ON CONFLICT")
+			db.Statement.Build(db.Statement.BuildClauses...)
 		}
 
 		if sch := db.Statement.Schema; sch != nil && len(sch.FieldsWithDefaultDBValue) > 0 {

callbacks/delete.go

@@ -135,7 +135,7 @@ func Delete(db *gorm.DB) {
 			}
 
 			db.Statement.AddClauseIfNotExists(clause.From{})
-			db.Statement.Build("DELETE", "FROM", "WHERE")
+			db.Statement.Build(db.Statement.BuildClauses...)
 		}
 
 		if _, ok := db.Statement.Clauses["WHERE"]; !db.AllowGlobalUpdate && !ok && db.Error == nil {

callbacks/query.go

@@ -167,7 +167,7 @@ func BuildQuerySQL(db *gorm.DB) {
 
 		db.Statement.AddClauseIfNotExists(clauseSelect)
 
-		db.Statement.Build("SELECT", "FROM", "WHERE", "GROUP BY", "ORDER BY", "LIMIT", "FOR")
+		db.Statement.Build(db.Statement.BuildClauses...)
 	}
 }
 

callbacks/update.go

@@ -66,7 +66,7 @@ func Update(db *gorm.DB) {
 			} else {
 				return
 			}
-			db.Statement.Build("UPDATE", "SET", "WHERE")
+			db.Statement.Build(db.Statement.BuildClauses...)
 		}
 
 		if _, ok := db.Statement.Clauses["WHERE"]; !db.AllowGlobalUpdate && !ok {

statement.go

@@ -27,6 +27,7 @@ type Statement struct {
 	Dest                 interface{}
 	ReflectValue         reflect.Value
 	Clauses              map[string]clause.Clause
+	BuildClauses         []string
 	Distinct             bool
 	Selects              []string // selected columns
 	Omits                []string // omit columns