本文整理汇总了Golang中github.com/go-xorm/core.Column.ValueOfV方法的典型用法代码示例。如果您正苦于以下问题：Golang Column.ValueOfV方法的具体用法？Golang Column.ValueOfV怎么用？Golang Column.ValueOfV使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类github.com/go-xorm/core.Column的用法示例。
在下文中一共展示了Column.ValueOfV方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Golang代码示例。
示例1: UpdateBatch
func (this *databaseImplement) UpdateBatch(rowsSlicePtr interface{}, indexColName string) (int64, error) {
sliceValue := reflect.Indirect(reflect.ValueOf(rowsSlicePtr))
if sliceValue.Kind() != reflect.Slice {
return 0, errors.New("needs a pointer to a slice")
}
if sliceValue.Len() == 0 {
return 0, errors.New("update rows is empty")
}
bean := sliceValue.Index(0).Interface()
elementValue := this.rValue(bean)
table := this.autoMapType(elementValue)
size := sliceValue.Len()
var rows = make([][]interface{}, 0)
var indexRow = make([]interface{}, 0)
cols := make([]*core.Column, 0)
updateCols := make([]bool, 0)
var indexCol *core.Column
//提取字段
for i := 0; i < size; i++ {
v := sliceValue.Index(i)
vv := reflect.Indirect(v)
//处理需要的update的列
if i == 0 {
for _, col := range table.Columns() {
if col.Name == indexColName {
indexCol = col
} else {
cols = append(cols, col)
updateCols = append(updateCols, false)
}
}
if indexCol == nil {
return 0, errors.New("counld not found index col " + indexColName)
}
}
//处理需要的update的值
var singleRow = make([]interface{}, 0)
for colIndex, col := range cols {
ptrFieldValue, err := col.ValueOfV(&vv)
if err != nil {
return 0, err
}
fieldValue := *ptrFieldValue
var arg interface{}
if this.isZero(fieldValue.Interface()) {
arg = nil
} else {
var err error
arg, err = this.value2Interface(fieldValue)
if err != nil {
return 0, err
}
updateCols[colIndex] = true
}
singleRow = append(singleRow, arg)
}
rows = append(rows, singleRow)
ptrFieldValue, err := indexCol.ValueOfV(&vv)
if err != nil {
return 0, err
}
fieldValue := *ptrFieldValue
arg, err := this.value2Interface(fieldValue)
if err != nil {
return 0, err
}
indexRow = append(indexRow, arg)
}
if len(cols) == 0 {
return 0, errors.New("update cols is empty! " + fmt.Sprintf("%v", rowsSlicePtr))
}
//拼接sql
var sqlArgs = make([]interface{}, 0)
var sql = "UPDATE " + table.Name + " SET "
var isFirstUpdateCol = true
for colIndex, col := range cols {
if updateCols[colIndex] == false {
continue
}
if isFirstUpdateCol == false {
sql += " , "
}
sql += this.Engine.QuoteStr() + col.Name + this.Engine.QuoteStr()
sql += " = CASE "
sql += this.Engine.QuoteStr() + indexCol.Name + this.Engine.QuoteStr()
for rowIndex, row := range rows {
if row[colIndex] == nil {
continue
}
sql += " WHEN ? THEN ? "
sqlArgs = append(sqlArgs, indexRow[rowIndex])
sqlArgs = append(sqlArgs, row[colIndex])
}
sql += " END "
//.........这里部分代码省略.........