use relfect.Type as key of tables map

README_CN.md

@@ -185,14 +185,14 @@ SQLite: [github.com/mattn/go-sqlite3](https://github.com/mattn/go-sqlite3)
 	}
 
 ##Mapping Rules
-1.Struct 和 Struct 的field名字应该为Pascal式命名，默认的映射规则将转换成用下划线连接的命名规则，这个映射是自动进行的，当然，你可以通过修改Engine或者Session的成员IMapper来改变它。
+1.Struct 和 Struct 的field名字应该为Pascal式命名，默认的映射规则将转换成用下划线连接的命名规则，这个映射是自动进行的，当然，你可以通过修改Engine的成员Mapper来改变它。
 
 例如：
 
 结构体的名字UserInfo将会自动对应数据库中的名为user_info的表。	
 UserInfo中的成员UserName将会自动对应名为user_name的字段。
 
-2.当然你也可以改变这个规则，这有两种方法。一是实现你自己的IMapper，你可以在mapper.go中查看到这个借口。然后设置到 engine.Mapper，这将影响所有的Session，或者你可以设置到某一个session，那么只会影响到这个session对应的操作。
+2.当然你也可以改变这个规则，这有两种方法。一是实现你自己的IMapper，你可以在mapper.go中查看到这个接口。然后设置到 engine.Mapper。
 
 另外一种方法就通过Field Tag来进行改变，关于Field Tag请参考Go的语言文档，如下列出了Tag中可用的关键字及其对应的意义：
 

engine.go

@@ -26,7 +26,7 @@ type Engine struct {
 	DBName          string
 	Charset         string
 	Others          string
-	Tables          map[string]Table
+	Tables          map[reflect.Type]Table
 	AutoIncrement   string
 	ShowSQL         bool
 	QuoteIdentifier string
@@ -38,6 +38,13 @@ func Type(bean interface{}) reflect.Type {
 	return reflect.TypeOf(sliceValue.Interface())
 }
 
+func StructName(v reflect.Type) string {
+	for v.Kind() == reflect.Ptr {
+		v = v.Elem()
+	}
+	return v.Name()
+}
+
 func (e *Engine) OpenDB() (db *sql.DB, err error) {
 	db = nil
 	err = nil
@@ -78,7 +85,6 @@ func (engine *Engine) MakeSession() (session Session, err error) {
 		engine.QuoteIdentifier = "`"
 		session = Session{Engine: engine, Db: db}
 	}
-	session.Mapper = engine.Mapper
 	session.Init()
 	return
 }
@@ -261,10 +267,9 @@ func (engine *Engine) MapType(t reflect.Type) Table {
 
 func (engine *Engine) Map(beans ...interface{}) (e error) {
 	for _, bean := range beans {
-		tableName := engine.Mapper.Obj2Table(StructName(bean))
+		t := Type(bean)
-		if _, ok := engine.Tables[tableName]; !ok {
+		if _, ok := engine.Tables[t]; !ok {
-			table := engine.MapOne(bean)
+			engine.Tables[t] = engine.MapOne(bean)
-			engine.Tables[table.Name] = table
 		}
 	}
 	return
@@ -272,14 +277,19 @@ func (engine *Engine) Map(beans ...interface{}) (e error) {
 
 func (engine *Engine) UnMap(beans ...interface{}) (e error) {
 	for _, bean := range beans {
-		tableName := engine.Mapper.Obj2Table(StructName(bean))
+		t := Type(bean)
-		if _, ok := engine.Tables[tableName]; ok {
+		if _, ok := engine.Tables[t]; ok {
-			delete(engine.Tables, tableName)
+			delete(engine.Tables, t)
 		}
 	}
 	return
 }
 
+func (engine *Engine) Bean2Table(bean interface{}) *Table {
+	table := engine.Tables[Type(bean)]
+	return &table
+}
+
 func (e *Engine) DropAll() error {
 	session, err := e.MakeSession()
 	session.Begin()
@@ -293,11 +303,10 @@ func (e *Engine) DropAll() error {
 		_, err = session.Exec(sql)
 		if err != nil {
 			session.Rollback()
-			break
+			return err
 		}
 	}
-	session.Commit()
+	return session.Commit()
-	return err
 }
 
 func (e *Engine) CreateTables(beans ...interface{}) error {
@@ -309,16 +318,15 @@ func (e *Engine) CreateTables(beans ...interface{}) error {
 	}
 	for _, bean := range beans {
 		table := e.MapOne(bean)
-		e.Tables[table.Name] = table
+		e.Tables[table.Type] = table
 		sql := e.genCreateSQL(&table)
 		_, err = session.Exec(sql)
 		if err != nil {
 			session.Rollback()
-			break
+			return err
 		}
 	}
-	session.Commit()
+	return session.Commit()
-	return err
 }
 
 func (e *Engine) CreateAll() error {

session.go

@@ -10,36 +10,11 @@ import (
 	"time"
 )
 
-func getTypeName(obj interface{}) (typestr string) {
-	typ := reflect.TypeOf(obj)
-	typestr = typ.String()
-
-	lastDotIndex := strings.LastIndex(typestr, ".")
-	if lastDotIndex != -1 {
-		typestr = typestr[lastDotIndex+1:]
-	}
-
-	return
-}
-
-func StructName(s interface{}) string {
-	v := reflect.TypeOf(s)
-	return Type2StructName(v)
-}
-
-func Type2StructName(v reflect.Type) string {
-	for v.Kind() == reflect.Ptr {
-		v = v.Elem()
-	}
-	return v.Name()
-}
-
 type Session struct {
 	Db           *sql.DB
 	Engine       *Engine
 	Tx           *sql.Tx
 	Statement    Statement
-	Mapper       IMapper
 	IsAutoCommit bool
 }
 
@@ -107,23 +82,13 @@ func (session *Session) Commit() error {
 	return session.Tx.Commit()
 }
 
-func (session *Session) TableName(bean interface{}) string {
-	return session.Mapper.Obj2Table(StructName(bean))
-}
-
-func (session *Session) Bean2Table(bean interface{}) *Table {
-	tablName := session.TableName(bean)
-	table := session.Engine.Tables[tablName]
-	return &table
-}
-
 func (session *Session) scanMapIntoStruct(obj interface{}, objMap map[string][]byte) error {
 	dataStruct := reflect.Indirect(reflect.ValueOf(obj))
 	if dataStruct.Kind() != reflect.Struct {
 		return errors.New("expected a pointer to a struct")
 	}
 
-	table := session.Bean2Table(obj)
+	table := session.Engine.Bean2Table(obj)
 
 	for key, data := range objMap {
 		structField := dataStruct.FieldByName(table.Columns[key].FieldName)
@@ -219,7 +184,7 @@ func (session *Session) Get(bean interface{}) error {
 	statement := session.Statement
 	defer session.Statement.Init()
 	statement.Limit(1)
-	table := session.Bean2Table(bean)
+	table := session.Engine.Bean2Table(bean)
 	statement.Table = table
 
 	colNames, args := session.BuildConditions(table, bean)
@@ -249,7 +214,7 @@ func (session *Session) Get(bean interface{}) error {
 func (session *Session) Count(bean interface{}) (int64, error) {
 	statement := session.Statement
 	defer session.Statement.Init()
-	table := session.Bean2Table(bean)
+	table := session.Engine.Bean2Table(bean)
 	statement.Table = table
 
 	colNames, args := session.BuildConditions(table, bean)
@@ -280,8 +245,7 @@ func (session *Session) Find(rowsSlicePtr interface{}, condiBean ...interface{})
 
 	sliceElementType := sliceValue.Type().Elem()
 
-	tableName := session.Mapper.Obj2Table(Type2StructName(sliceElementType))
+	table := session.Engine.Tables[sliceElementType]
-	table := session.Engine.Tables[tableName]
 	statement.Table = &table
 
 	if len(condiBean) > 0 {
@@ -389,7 +353,7 @@ func (session *Session) Insert(beans ...interface{}) (int64, error) {
 }
 
 func (session *Session) InsertOne(bean interface{}) (int64, error) {
-	table := session.Bean2Table(bean)
+	table := session.Engine.Bean2Table(bean)
 
 	colNames := make([]string, 0)
 	colPlaces := make([]string, 0)
@@ -460,7 +424,7 @@ func (session *Session) BuildConditions(table *Table, bean interface{}) ([]strin
 }
 
 func (session *Session) Update(bean interface{}, condiBean ...interface{}) (int64, error) {
-	table := session.Bean2Table(bean)
+	table := session.Engine.Bean2Table(bean)
 	colNames, args := session.BuildConditions(table, bean)
 	var condiColNames []string
 	var condiArgs []interface{}
@@ -508,7 +472,7 @@ func (session *Session) Update(bean interface{}, condiBean ...interface{}) (int6
 }
 
 func (session *Session) Delete(bean interface{}) (int64, error) {
-	table := session.Bean2Table(bean)
+	table := session.Engine.Bean2Table(bean)
 	colNames, args := session.BuildConditions(table, bean)
 
 	var condition = ""

xorm.go

@@ -1,6 +1,7 @@
 package xorm
 
 import (
+	"reflect"
 	"strings"
 )
 
@@ -11,7 +12,7 @@ import (
 func Create(schema string) Engine {
 	engine := Engine{}
 	engine.Mapper = SnakeMapper{}
-	engine.Tables = make(map[string]Table)
+	engine.Tables = make(map[reflect.Type]Table)
 	engine.Statement.Engine = &engine
 	l := strings.Split(schema, "://")
 	if len(l) == 2 {