add Scan features to Get method

README.md

@@ -145,6 +145,18 @@ has, err := engine.Get(&user)
 // SELECT * FROM user LIMIT 1
 has, err := engine.Where("name = ?", name).Desc("id").Get(&user)
 // SELECT * FROM user WHERE name = ? ORDER BY id DESC LIMIT 1
+var name string
+has, err := engine.Where("id = ?", id).Cols("name").Get(&name)
+// SELECT name FROM user WHERE id = ?
+var id int64
+has, err := engine.Where("name = ?", name).Cols("id").Get(&id)
+// SELECT id FROM user WHERE name = ?
+var valuesMap = make(map[string]string)
+has, err := engine.Where("id = ?", id).Get(&valuesMap)
+// SELECT * FROM user WHERE id = ?
+var valuesSlice = make([]interface{}, len(cols))
+has, err := engine.Where("id = ?", id).Cols(cols...).Get(&valuesSlice)
+// SELECT col1, col2, col3 FROM user WHERE id = ?
 ```
 
 * Query multiple records from database, also you can use join and extends

README_CN.md

@@ -149,6 +149,18 @@ has, err := engine.Get(&user)
 // SELECT * FROM user LIMIT 1
 has, err := engine.Where("name = ?", name).Desc("id").Get(&user)
 // SELECT * FROM user WHERE name = ? ORDER BY id DESC LIMIT 1
+var name string
+has, err := engine.Where("id = ?", id).Cols("name").Get(&name)
+// SELECT name FROM user WHERE id = ?
+var id int64
+has, err := engine.Where("name = ?", name).Cols("id").Get(&id)
+// SELECT id FROM user WHERE name = ?
+var valuesMap = make(map[string]string)
+has, err := engine.Where("id = ?", id).Get(&valuesMap)
+// SELECT * FROM user WHERE id = ?
+var valuesSlice = make([]interface{}, len(cols))
+has, err := engine.Where("id = ?", id).Cols(cols...).Get(&valuesSlice)
+// SELECT col1, col2, col3 FROM user WHERE id = ?
 ```
 
 * 查询多条记录，当然可以使用Join和extends来组合使用

session_get.go

@@ -22,12 +22,7 @@ func (session *Session) Get(bean interface{}) (bool, error) {
 
 	beanValue := reflect.ValueOf(bean)
 	if beanValue.Kind() != reflect.Ptr {
-		return false, errors.New("needs a pointer to a struct")
-	}
-
-	// FIXME: remove this after support non-struct Get
-	if beanValue.Elem().Kind() != reflect.Struct {
-		return false, errors.New("needs a pointer to a struct")
+		return false, errors.New("needs a pointer")
 	}
 
 	if beanValue.Elem().Kind() == reflect.Struct {
@@ -48,7 +43,7 @@ func (session *Session) Get(bean interface{}) (bool, error) {
 		args = session.Statement.RawParams
 	}
 
-	if session.canCache() {
+	if session.canCache() && beanValue.Elem().Kind() == reflect.Struct {
 		if cacher := session.Engine.getCacher2(session.Statement.RefTable); cacher != nil &&
 			!session.Statement.unscoped {
 			has, err := session.cacheGet(bean, sqlStr, args...)
@@ -62,9 +57,10 @@ func (session *Session) Get(bean interface{}) (bool, error) {
 }
 
 func (session *Session) nocacheGet(beanKind reflect.Kind, bean interface{}, sqlStr string, args ...interface{}) (bool, error) {
+	session.queryPreprocess(&sqlStr, args...)
+
 	var rawRows *core.Rows
 	var err error
-	session.queryPreprocess(&sqlStr, args...)
 	if session.IsAutoCommit {
 		_, rawRows, err = session.innerQuery(sqlStr, args...)
 	} else {
@@ -77,14 +73,13 @@ func (session *Session) nocacheGet(beanKind reflect.Kind, bean interface{}, sqlS
 	defer rawRows.Close()
 
 	if rawRows.Next() {
-		fields, err := rawRows.Columns()
-		if err != nil {
-			// WARN: Alougth rawRows return true, but get fields failed
-			return true, err
-		}
-
 		switch beanKind {
 		case reflect.Struct:
+			fields, err := rawRows.Columns()
+			if err != nil {
+				// WARN: Alougth rawRows return true, but get fields failed
+				return true, err
+			}
 			dataStruct := rValue(bean)
 			session.Statement.setRefValue(dataStruct)
 			_, err = session.row2Bean(rawRows, fields, len(fields), bean, &dataStruct, session.Statement.RefTable)

session_get_test.go

@@ -0,0 +1,91 @@
+// Copyright 2017 The Xorm Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package xorm
+
+import (
+	"fmt"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGetVar(t *testing.T) {
+	assert.NoError(t, prepareEngine())
+
+	type GetVar struct {
+		Id      int64  `xorm:"autoincr pk"`
+		Msg     string `xorm:"varchar(255)"`
+		Age     int
+		Money   float32
+		Created time.Time `xorm:"created"`
+	}
+
+	assert.NoError(t, testEngine.Sync2(new(GetVar)))
+
+	var data = GetVar{
+		Msg:   "hi",
+		Age:   28,
+		Money: 1.5,
+	}
+	_, err := testEngine.InsertOne(data)
+	assert.NoError(t, err)
+
+	var msg string
+	has, err := testEngine.Table("get_var").Cols("msg").Get(&msg)
+	assert.NoError(t, err)
+	assert.Equal(t, true, has)
+	assert.Equal(t, "hi", msg)
+
+	var age int
+	has, err = testEngine.Table("get_var").Cols("age").Get(&age)
+	assert.NoError(t, err)
+	assert.Equal(t, true, has)
+	assert.Equal(t, 28, age)
+
+	var money float64
+	has, err = testEngine.Table("get_var").Cols("money").Get(&money)
+	assert.NoError(t, err)
+	assert.Equal(t, true, has)
+	assert.Equal(t, "1.5", fmt.Sprintf("%.1f", money))
+
+	var valuesString = make(map[string]string)
+	has, err = testEngine.Table("get_var").Get(&valuesString)
+	assert.NoError(t, err)
+	assert.Equal(t, true, has)
+	assert.Equal(t, 5, len(valuesString))
+	assert.Equal(t, "1", valuesString["id"])
+	assert.Equal(t, "hi", valuesString["msg"])
+	assert.Equal(t, "28", valuesString["age"])
+	assert.Equal(t, "1.5", valuesString["money"])
+
+	var valuesInter = make(map[string]interface{})
+	has, err = testEngine.Table("get_var").Where("id = ?", 1).Select("*").Get(&valuesInter)
+	assert.NoError(t, err)
+	assert.Equal(t, true, has)
+	assert.Equal(t, 5, len(valuesInter))
+	assert.EqualValues(t, 1, valuesInter["id"])
+	assert.Equal(t, "hi", fmt.Sprintf("%s", valuesInter["msg"]))
+	assert.EqualValues(t, 28, valuesInter["age"])
+	assert.Equal(t, "1.5", fmt.Sprintf("%v", valuesInter["money"]))
+
+	var valuesSliceString = make([]string, 5)
+	has, err = testEngine.Table("get_var").Get(&valuesSliceString)
+	assert.NoError(t, err)
+	assert.Equal(t, true, has)
+	assert.Equal(t, "1", valuesSliceString[0])
+	assert.Equal(t, "hi", valuesSliceString[1])
+	assert.Equal(t, "28", valuesSliceString[2])
+	assert.Equal(t, "1.5", valuesSliceString[3])
+
+	var valuesSliceInter = make([]interface{}, 5)
+	has, err = testEngine.Table("get_var").Get(&valuesSliceInter)
+	assert.NoError(t, err)
+	assert.Equal(t, true, has)
+	assert.EqualValues(t, 1, valuesSliceInter[0])
+	assert.Equal(t, "hi", fmt.Sprintf("%s", valuesSliceInter[1]))
+	assert.EqualValues(t, 28, valuesSliceInter[2])
+	assert.Equal(t, "1.5", fmt.Sprintf("%v", valuesSliceInter[3]))
+}

statement.go

@@ -1114,7 +1114,11 @@ func (statement *Statement) genConds(bean interface{}) (string, []interface{}, e
 }
 
 func (statement *Statement) genGetSQL(bean interface{}) (string, []interface{}) {
-	statement.setRefValue(rValue(bean))
+	v := rValue(bean)
+	isStruct := v.Kind() == reflect.Struct
+	if isStruct {
+		statement.setRefValue(v)
+	}
 
 	var columnStr = statement.ColumnStr
 	if len(statement.selectStr) > 0 {
@@ -1133,14 +1137,22 @@ func (statement *Statement) genGetSQL(bean interface{}) (string, []interface{})
 			if len(columnStr) == 0 {
 				if len(statement.GroupByStr) > 0 {
 					columnStr = statement.Engine.Quote(strings.Replace(statement.GroupByStr, ",", statement.Engine.Quote(","), -1))
-				} else {
-					columnStr = "*"
 				}
 			}
 		}
 	}
 
-	condSQL, condArgs, _ := statement.genConds(bean)
+	if len(columnStr) == 0 {
+		columnStr = "*"
+	}
+
+	var condSQL string
+	var condArgs []interface{}
+	if isStruct {
+		condSQL, condArgs, _ = statement.genConds(bean)
+	} else {
+		condSQL, condArgs, _ = builder.ToSQL(statement.cond)
+	}
 
 	return statement.genSelectSQL(columnStr, condSQL), append(statement.joinArgs, condArgs...)
 }

xorm.go

@@ -17,7 +17,7 @@ import (
 
 const (
 	// Version show the xorm's version
-	Version string = "0.6.2.0326"
+	Version string = "0.6.2.0401"
 )
 
 func regDrvsNDialects() bool {