需要用到根據唯一索引來進行批量更新和插入,這裏利用ON DUPLICATE KEY UPDATE 來進行更新,遇到的問題:
1)因爲剛接觸go 不太清楚如何將切片轉換爲字符串,所以自己寫了一個 方法 MapTranslateString
2)因爲剛接觸go 不太清楚orm的 sql的佔位符除了‘?’之外還能是什麼,導致打印出來的sql語句一堆問號,如果有錯誤也不好排查
// o orm 對象, dataList 需要傳入參數 fieldList dataList 的 map的字符串鍵值 (更新的字段),tableName 表名稱 ,size 一次插入長度
func (oh *OrmHelper) OnDuplicateKeyUpdate(O orm.Ormer, dataList []map[string]interface{}, fieldList []string, tableName string, size int) {
if size < 100 {
size = 100
}
tempList := dataList
for dataList != nil {
if len(dataList) > size {
tempList = dataList[:size]
temp := append(dataList[:0], dataList[size:]...)
dataList = temp
} else {
tempList = dataList
dataList = nil
}
sql := "INSERT INTO " + tableName + "(" + MapTranslateString(fieldList, ",") + ") VALUES"
rawInterface := make([]interface{}, 0)
for _, data := range tempList {
var rawInterfaceTemp = make([]interface{}, len(fieldList))
if data != nil {
sql += "("
var i = 0
for _, field := range fieldList {
if data[field] == nil {
panic("批量插入失敗!傳入的數據中不存在字段" + field)
}
sql += "?,"
rawInterfaceTemp[i] = data[field]
i++
}
rawInterface = append(rawInterface, rawInterfaceTemp)
sql = string([]byte(sql[:len(sql)-1])) + "),"
}
}
sql = string([]byte(sql[:len(sql)-1]))
sql += " ON DUPLICATE KEY UPDATE "
for _, field := range fieldList {
sql += "`" + field + "`=values(`" + field + "`),"
}
sql = string([]byte(sql[:len(sql)-1]))
_, err := O.Raw(sql, rawInterface).Exec()
if err != nil {
panic(err)
}
}
}
func MapTranslateString(mapString []string, op string) string {
str := ""
length := len(mapString)
if length > 0 {
for i, value := range mapString {
if i == 0 {
str += value
} else if i < length {
str += op + value
}
}
}
return str
}