Add NamedArg support

README.md

@@ -19,7 +19,7 @@ The fantastic ORM library for Golang, aims to be developer friendly.
 * Transactions, Nested Transactions, Save Point, RollbackTo to Saved Point
 * Context, Prepared Statment Mode, DryRun Mode
 * Batch Insert, FindInBatches, Find To Map
-* SQL Builder, Upsert, Locking, Optimizer/Index/Comment Hints
+* SQL Builder, Upsert, Locking, Optimizer/Index/Comment Hints, NamedArg
 * Composite Primary Key
 * Auto Migrations
 * Logger

callbacks.go

@@ -107,7 +107,6 @@ func (p *processor) Execute(db *DB) {
 	if !stmt.DB.DryRun {
 		stmt.SQL.Reset()
 		stmt.Vars = nil
-		stmt.NamedVars = nil
 	}
 }
 

chainable_api.go

@@ -265,6 +265,11 @@ func (db *DB) Unscoped() (tx *DB) {
 func (db *DB) Raw(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
 }

clause/expression.go

@@ -1,6 +1,7 @@
 package clause
 
 import (
+	"database/sql"
 	"database/sql/driver"
 	"reflect"
 )
@@ -62,6 +63,64 @@ func (expr Expr) Build(builder Builder) {
 	}
 }
 
+// NamedExpr raw expression for named expr
+type NamedExpr struct {
+	SQL  string
+	Vars []interface{}
+}
+
+// Build build raw expression
+func (expr NamedExpr) Build(builder Builder) {
+	var (
+		idx      int
+		inName   bool
+		namedMap = make(map[string]interface{}, len(expr.Vars))
+	)
+
+	for _, v := range expr.Vars {
+		switch value := v.(type) {
+		case sql.NamedArg:
+			namedMap[value.Name] = value.Value
+		case map[string]interface{}:
+			for k, v := range value {
+				namedMap[k] = v
+			}
+		}
+	}
+
+	name := make([]byte, 0, 10)
+
+	for _, v := range []byte(expr.SQL) {
+		if v == '@' && !inName {
+			inName = true
+			name = []byte{}
+		} else if v == ' ' || v == ',' || v == ')' || v == '"' || v == '\'' || v == '`' {
+			if inName {
+				if nv, ok := namedMap[string(name)]; ok {
+					builder.AddVar(builder, nv)
+				} else {
+					builder.WriteByte('@')
+					builder.WriteString(string(name))
+				}
+				inName = false
+			}
+
+			builder.WriteByte(v)
+		} else if v == '?' {
+			builder.AddVar(builder, expr.Vars[idx])
+			idx++
+		} else if inName {
+			name = append(name, v)
+		} else {
+			builder.WriteByte(v)
+		}
+	}
+
+	if inName {
+		builder.AddVar(builder, namedMap[string(name)])
+	}
+}
+
 // IN Whether a value is within a set of values
 type IN struct {
 	Column interface{}

clause/expression_test.go

@@ -1,7 +1,9 @@
 package clause_test
 
 import (
+	"database/sql"
 	"fmt"
+	"reflect"
 	"sync"
 	"testing"
 
@@ -33,3 +35,51 @@ func TestExpr(t *testing.T) {
 		})
 	}
 }
+
+func TestNamedExpr(t *testing.T) {
+	results := []struct {
+		SQL          string
+		Result       string
+		Vars         []interface{}
+		ExpectedVars []interface{}
+	}{{
+		SQL:    "create table ? (? ?, ? ?)",
+		Vars:   []interface{}{clause.Table{Name: "users"}, clause.Column{Name: "id"}, clause.Expr{SQL: "int"}, clause.Column{Name: "name"}, clause.Expr{SQL: "text"}},
+		Result: "create table `users` (`id` int, `name` text)",
+	}, {
+		SQL:          "name1 = @name AND name2 = @name",
+		Vars:         []interface{}{sql.Named("name", "jinzhu")},
+		Result:       "name1 = ? AND name2 = ?",
+		ExpectedVars: []interface{}{"jinzhu", "jinzhu"},
+	}, {
+		SQL:          "name1 = @name1 AND name2 = @name2 AND name3 = @name1",
+		Vars:         []interface{}{sql.Named("name1", "jinzhu"), sql.Named("name2", "jinzhu2")},
+		Result:       "name1 = ? AND name2 = ? AND name3 = ?",
+		ExpectedVars: []interface{}{"jinzhu", "jinzhu2", "jinzhu"},
+	}, {
+		SQL:          "name1 = @name1 AND name2 = @name2 AND name3 = @name1",
+		Vars:         []interface{}{map[string]interface{}{"name1": "jinzhu", "name2": "jinzhu2"}},
+		Result:       "name1 = ? AND name2 = ? AND name3 = ?",
+		ExpectedVars: []interface{}{"jinzhu", "jinzhu2", "jinzhu"},
+	}, {
+		SQL:          "@@test AND name1 = @name1 AND name2 = @name2 AND name3 = @name1 @notexist",
+		Vars:         []interface{}{sql.Named("name1", "jinzhu"), sql.Named("name2", "jinzhu2")},
+		Result:       "@@test AND name1 = ? AND name2 = ? AND name3 = ? ?",
+		ExpectedVars: []interface{}{"jinzhu", "jinzhu2", "jinzhu", nil},
+	}}
+
+	for idx, result := range results {
+		t.Run(fmt.Sprintf("case #%v", idx), func(t *testing.T) {
+			user, _ := schema.Parse(&tests.User{}, &sync.Map{}, db.NamingStrategy)
+			stmt := &gorm.Statement{DB: db, Table: user.Table, Schema: user, Clauses: map[string]clause.Clause{}}
+			clause.NamedExpr{SQL: result.SQL, Vars: result.Vars}.Build(stmt)
+			if stmt.SQL.String() != result.Result {
+				t.Errorf("generated SQL is not equal, expects %v, but got %v", result.Result, stmt.SQL.String())
+			}
+
+			if !reflect.DeepEqual(result.ExpectedVars, stmt.Vars) {
+				t.Errorf("generated vars is not equal, expects %v, but got %v", result.ExpectedVars, stmt.Vars)
+			}
+		})
+	}
+}

finisher_api.go

@@ -453,7 +453,13 @@ func (db *DB) RollbackTo(name string) *DB {
 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)
+	}
+
 	tx.callbacks.Raw().Execute(tx)
 	return
 }

statement.go

@@ -38,7 +38,6 @@ type Statement struct {
 	UpdatingColumn       bool
 	SQL                  strings.Builder
 	Vars                 []interface{}
-	NamedVars            []sql.NamedArg
 	CurDestIndex         int
 	attrs                []interface{}
 	assigns              []interface{}
@@ -148,14 +147,7 @@ func (stmt *Statement) AddVar(writer clause.Writer, vars ...interface{}) {
 
 		switch v := v.(type) {
 		case sql.NamedArg:
-			if len(v.Name) > 0 {
-				stmt.NamedVars = append(stmt.NamedVars, v)
-				writer.WriteByte('@')
-				writer.WriteString(v.Name)
-			} else {
 			stmt.Vars = append(stmt.Vars, v.Value)
-				stmt.DB.Dialector.BindVarTo(writer, stmt, v.Value)
-			}
 		case clause.Column, clause.Table:
 			stmt.QuoteTo(writer, v)
 		case clause.Expr:
@@ -234,16 +226,19 @@ func (stmt *Statement) AddClauseIfNotExists(v clause.Interface) {
 
 // BuildCondition build condition
 func (stmt *Statement) BuildCondition(query interface{}, args ...interface{}) (conds []clause.Expression) {
-	if sql, ok := query.(string); ok {
+	if s, ok := query.(string); ok {
 		// if it is a number, then treats it as primary key
-		if _, err := strconv.Atoi(sql); err != nil {
+		if _, err := strconv.Atoi(s); err != nil {
-			if sql == "" && len(args) == 0 {
+			if s == "" && len(args) == 0 {
 				return
-			} else if len(args) == 0 || (len(args) > 0 && strings.Contains(sql, "?")) || strings.Contains(sql, "@") {
+			} else if len(args) == 0 || (len(args) > 0 && strings.Contains(s, "?")) {
 				// looks like a where condition
-				return []clause.Expression{clause.Expr{SQL: sql, Vars: args}}
+				return []clause.Expression{clause.Expr{SQL: s, Vars: args}}
+			} else if len(args) > 0 && strings.Contains(s, "@") {
+				// looks like a named query
+				return []clause.Expression{clause.NamedExpr{SQL: s, Vars: args}}
 			} else if len(args) == 1 {
-				return []clause.Expression{clause.Eq{Column: sql, Value: args[0]}}
+				return []clause.Expression{clause.Eq{Column: s, Value: args[0]}}
 			}
 		}
 	}

tests/named_argument_test.go

@@ -0,0 +1,57 @@
+package tests_test
+
+import (
+	"database/sql"
+	"testing"
+
+	"gorm.io/gorm"
+	. "gorm.io/gorm/utils/tests"
+)
+
+func TestNamedArg(t *testing.T) {
+	type NamedUser struct {
+		gorm.Model
+		Name1 string
+		Name2 string
+		Name3 string
+	}
+
+	DB.Migrator().DropTable(&NamedUser{})
+	DB.AutoMigrate(&NamedUser{})
+
+	namedUser := NamedUser{Name1: "jinzhu1", Name2: "jinzhu2", Name3: "jinzhu3"}
+	DB.Create(&namedUser)
+
+	var result NamedUser
+	DB.First(&result, "name1 = @name OR name2 = @name OR name3 = @name", sql.Named("name", "jinzhu2"))
+
+	AssertEqual(t, result, namedUser)
+
+	var result2 NamedUser
+	DB.Where("name1 = @name OR name2 = @name OR name3 = @name", sql.Named("name", "jinzhu2")).First(&result2)
+
+	AssertEqual(t, result2, namedUser)
+
+	var result3 NamedUser
+	DB.Where("name1 = @name OR name2 = @name OR name3 = @name", map[string]interface{}{"name": "jinzhu2"}).First(&result3)
+
+	AssertEqual(t, result3, namedUser)
+
+	var result4 NamedUser
+	if err := DB.Raw("SELECT * FROM named_users WHERE name1 = @name OR name2 = @name2 OR name3 = @name", sql.Named("name", "jinzhu-none"), sql.Named("name2", "jinzhu2")).Find(&result4).Error; err != nil {
+		t.Errorf("failed to update with named arg")
+	}
+
+	AssertEqual(t, result4, namedUser)
+
+	if err := DB.Exec("UPDATE named_users SET name1 = @name, name2 = @name2, name3 = @name", sql.Named("name", "jinzhu-new"), sql.Named("name2", "jinzhu-new2")).Error; err != nil {
+		t.Errorf("failed to update with named arg")
+	}
+
+	var result5 NamedUser
+	if err := DB.Raw("SELECT * FROM named_users WHERE (name1 = @name AND name3 = @name) AND name2 = @name2", sql.Named("name", "jinzhu-new"), sql.Named("name2", "jinzhu-new2")).Find(&result5).Error; err != nil {
+		t.Errorf("failed to update with named arg")
+	}
+
+	AssertEqual(t, result4, namedUser)
+}