Add QuoteTo method

dialects/mssql/mssql.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"regexp"
 	"strconv"
+	"strings"
 
 	_ "github.com/denisenkom/go-mssqldb"
 	"github.com/jinzhu/gorm"
@@ -42,8 +43,10 @@ func (dialector Dialector) BindVar(stmt *gorm.Statement, v interface{}) string {
 	return "@p" + strconv.Itoa(len(stmt.Vars))
 }
 
-func (dialector Dialector) QuoteChars() [2]byte {
+func (dialector Dialector) QuoteTo(builder *strings.Builder, str string) {
-	return [2]byte{'"', '"'} // `name`
+	builder.WriteByte('"')
+	builder.WriteString(str)
+	builder.WriteByte('"')
 }
 
 var numericPlaceholder = regexp.MustCompile("@p(\\d+)")

dialects/mysql/mysql.go

@@ -4,6 +4,7 @@ import (
 	"database/sql"
 	"fmt"
 	"math"
+	"strings"
 
 	_ "github.com/go-sql-driver/mysql"
 	"github.com/jinzhu/gorm"
@@ -39,8 +40,10 @@ func (dialector Dialector) BindVar(stmt *gorm.Statement, v interface{}) string {
 	return "?"
 }
 
-func (dialector Dialector) QuoteChars() [2]byte {
+func (dialector Dialector) QuoteTo(builder *strings.Builder, str string) {
-	return [2]byte{'`', '`'} // `name`
+	builder.WriteByte('`')
+	builder.WriteString(str)
+	builder.WriteByte('`')
 }
 
 func (dialector Dialector) Explain(sql string, vars ...interface{}) string {

dialects/postgres/postgres.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"regexp"
 	"strconv"
+	"strings"
 
 	"github.com/jinzhu/gorm"
 	"github.com/jinzhu/gorm/callbacks"
@@ -42,8 +43,10 @@ func (dialector Dialector) BindVar(stmt *gorm.Statement, v interface{}) string {
 	return "$" + strconv.Itoa(len(stmt.Vars))
 }
 
-func (dialector Dialector) QuoteChars() [2]byte {
+func (dialector Dialector) QuoteTo(builder *strings.Builder, str string) {
-	return [2]byte{'"', '"'} // "name"
+	builder.WriteByte('"')
+	builder.WriteString(str)
+	builder.WriteByte('"')
 }
 
 var numericPlaceholder = regexp.MustCompile("\\$(\\d+)")

dialects/sqlite/sqlite.go

@@ -2,6 +2,7 @@ package sqlite
 
 import (
 	"database/sql"
+	"strings"
 
 	"github.com/jinzhu/gorm"
 	"github.com/jinzhu/gorm/callbacks"
@@ -38,8 +39,10 @@ func (dialector Dialector) BindVar(stmt *gorm.Statement, v interface{}) string {
 	return "?"
 }
 
-func (dialector Dialector) QuoteChars() [2]byte {
+func (dialector Dialector) QuoteTo(builder *strings.Builder, str string) {
-	return [2]byte{'`', '`'} // `name`
+	builder.WriteByte('`')
+	builder.WriteString(str)
+	builder.WriteByte('`')
 }
 
 func (dialector Dialector) Explain(sql string, vars ...interface{}) string {

go.mod

@@ -3,6 +3,10 @@ module github.com/jinzhu/gorm
 go 1.13
 
 require (
+	github.com/denisenkom/go-mssqldb v0.0.0-20200206145737-bbfc9a55622e // indirect
+	github.com/go-sql-driver/mysql v1.5.0 // indirect
 	github.com/jinzhu/inflection v1.0.0
 	github.com/jinzhu/now v1.1.1
+	github.com/lib/pq v1.3.0 // indirect
+	github.com/mattn/go-sqlite3 v2.0.3+incompatible // indirect
 )

gorm.go

@@ -79,7 +79,6 @@ func Open(dialector Dialector, config *Config) (db *DB, err error) {
 
 	if dialector != nil {
 		err = dialector.Initialize(db)
-		db.quoteChars = dialector.QuoteChars()
 	}
 	return
 }

interfaces.go

@@ -3,6 +3,7 @@ package gorm
 import (
 	"context"
 	"database/sql"
+	"strings"
 
 	"github.com/jinzhu/gorm/schema"
 )
@@ -13,7 +14,7 @@ type Dialector interface {
 	Migrator(db *DB) Migrator
 	DataTypeOf(*schema.Field) string
 	BindVar(stmt *Statement, v interface{}) string
-	QuoteChars() [2]byte
+	QuoteTo(*strings.Builder, string)
 	Explain(sql string, vars ...interface{}) string
 }
 

statement.go

@@ -76,65 +76,58 @@ func (stmt *Statement) WriteByte(c byte) (err error) {
 	return stmt.SQL.WriteByte(c)
 }
 
-// WriteQuoted write quoted field
+// WriteQuoted write quoted value
-func (stmt *Statement) WriteQuoted(field interface{}) (err error) {
+func (stmt *Statement) WriteQuoted(value interface{}) error {
-	_, err = stmt.SQL.WriteString(stmt.Quote(field))
+	stmt.QuoteTo(&stmt.SQL, value)
-	return
+	return nil
 }
 
-// Quote returns quoted value
+// QuoteTo write quoted value to writer
-func (stmt Statement) Quote(field interface{}) string {
+func (stmt Statement) QuoteTo(writer *strings.Builder, field interface{}) {
-	var str strings.Builder
-	str.WriteByte(stmt.DB.quoteChars[0])
-
 	switch v := field.(type) {
 	case clause.Table:
 		if v.Name == clause.CurrentTable {
-			str.WriteString(stmt.Table)
+			stmt.DB.Dialector.QuoteTo(writer, stmt.Table)
 		} else {
-			str.WriteString(v.Name)
+			stmt.DB.Dialector.QuoteTo(writer, v.Name)
 		}
 
 		if v.Alias != "" {
-			str.WriteByte(stmt.DB.quoteChars[1])
+			writer.WriteString(" AS ")
-			str.WriteString(" AS ")
+			stmt.DB.Dialector.QuoteTo(writer, v.Alias)
-			str.WriteByte(stmt.DB.quoteChars[0])
-			str.WriteString(v.Alias)
-			str.WriteByte(stmt.DB.quoteChars[1])
 		}
 	case clause.Column:
 		if v.Table != "" {
 			if v.Table == clause.CurrentTable {
-				str.WriteString(stmt.Table)
+				stmt.DB.Dialector.QuoteTo(writer, stmt.Table)
 			} else {
-				str.WriteString(v.Table)
+				stmt.DB.Dialector.QuoteTo(writer, v.Table)
 			}
-			str.WriteByte(stmt.DB.quoteChars[1])
+			writer.WriteByte('.')
-			str.WriteByte('.')
-			str.WriteByte(stmt.DB.quoteChars[0])
 		}
 
 		if v.Name == clause.PrimaryKey {
 			if stmt.Schema != nil && stmt.Schema.PrioritizedPrimaryField != nil {
-				str.WriteString(stmt.Schema.PrioritizedPrimaryField.DBName)
+				stmt.DB.Dialector.QuoteTo(writer, stmt.Schema.PrioritizedPrimaryField.DBName)
 			}
 		} else {
-			str.WriteString(v.Name)
+			stmt.DB.Dialector.QuoteTo(writer, v.Name)
 		}
 
 		if v.Alias != "" {
-			str.WriteByte(stmt.DB.quoteChars[1])
+			writer.WriteString(" AS ")
-			str.WriteString(" AS ")
+			stmt.DB.Dialector.QuoteTo(writer, v.Alias)
-			str.WriteByte(stmt.DB.quoteChars[0])
-			str.WriteString(v.Alias)
-			str.WriteByte(stmt.DB.quoteChars[1])
 		}
 	default:
-		str.WriteString(fmt.Sprint(field))
+		stmt.DB.Dialector.QuoteTo(writer, fmt.Sprint(field))
 	}
+}
 
-	str.WriteByte(stmt.DB.quoteChars[1])
+// Quote returns quoted value
-	return str.String()
+func (stmt Statement) Quote(field interface{}) string {
+	var builder strings.Builder
+	stmt.QuoteTo(&builder, field)
+	return builder.String()
 }
 
 // Write write string

tests/dummy_dialecter.go

@@ -1,6 +1,8 @@
 package tests
 
 import (
+	"strings"
+
 	"github.com/jinzhu/gorm"
 	"github.com/jinzhu/gorm/logger"
 	"github.com/jinzhu/gorm/schema"
@@ -21,8 +23,10 @@ func (DummyDialector) BindVar(stmt *gorm.Statement, v interface{}) string {
 	return "?"
 }
 
-func (DummyDialector) QuoteChars() [2]byte {
+func (DummyDialector) QuoteTo(builder *strings.Builder, str string) {
-	return [2]byte{'`', '`'} // `name`
+	builder.WriteByte('`')
+	builder.WriteString(str)
+	builder.WriteByte('`')
 }
 
 func (DummyDialector) Explain(sql string, vars ...interface{}) string {