refactor(db): 重构数据库查询构建器以支持多数据库方言和标识符处理

- 实现了标识符处理器，统一处理表名、字段名的前缀添加和引号转换
- 添加对 MySQL、PostgreSQL、SQLite 三种数据库方言的支持
- 引入 ProcessTableName、ProcessColumn、ProcessConditionString 等方法处理标识符
- 为 HoTimeDB 添加 T() 和 C() 辅助方法用于手动构建 SQL 查询
- 重构 CRUD 操作中的表名和字段名处理逻辑，统一使用标识符处理器
- 添加完整的单元测试验证不同数据库方言下的标识符处理功能
- 优化 JOIN 操作中表名和条件字符串的处理方式

db/where.go

@@ -206,6 +206,7 @@ func (that *HoTimeDB) varCond(k string, v interface{}) (string, []interface{}) {
 	where := ""
 	res := make([]interface{}, 0)
 	length := len(k)
+	processor := that.GetProcessor()
 
 	if k == "[#]" {
 		k = strings.Replace(k, "[#]", "", -1)
@@ -219,73 +220,53 @@ func (that *HoTimeDB) varCond(k string, v interface{}) (string, []interface{}) {
 		switch Substr(k, length-3, 3) {
 		case "[>]":
 			k = strings.Replace(k, "[>]", "", -1)
-			if !strings.Contains(k, ".") {
-				k = "`" + k + "` "
-			}
+			k = processor.ProcessColumn(k) + " "
 			where += k + ">? "
 			res = append(res, v)
 		case "[<]":
 			k = strings.Replace(k, "[<]", "", -1)
-			if !strings.Contains(k, ".") {
-				k = "`" + k + "` "
-			}
+			k = processor.ProcessColumn(k) + " "
 			where += k + "<? "
 			res = append(res, v)
 		case "[!]":
 			k = strings.Replace(k, "[!]", "", -1)
-			if !strings.Contains(k, ".") {
-				k = "`" + k + "` "
-			}
+			k = processor.ProcessColumn(k) + " "
 			where, res = that.notIn(k, v, where, res)
 		case "[#]":
 			k = strings.Replace(k, "[#]", "", -1)
-			if !strings.Contains(k, ".") {
-				k = "`" + k + "` "
-			}
+			k = processor.ProcessColumn(k) + " "
 			where += " " + k + "=" + ObjToStr(v) + " "
 		case "[##]": // 直接添加value到sql，需要考虑防注入
 			where += " " + ObjToStr(v)
 		case "[#!]":
 			k = strings.Replace(k, "[#!]", "", -1)
-			if !strings.Contains(k, ".") {
-				k = "`" + k + "` "
-			}
+			k = processor.ProcessColumn(k) + " "
 			where += " " + k + "!=" + ObjToStr(v) + " "
 		case "[!#]":
 			k = strings.Replace(k, "[!#]", "", -1)
-			if !strings.Contains(k, ".") {
-				k = "`" + k + "` "
-			}
+			k = processor.ProcessColumn(k) + " "
 			where += " " + k + "!=" + ObjToStr(v) + " "
 		case "[~]":
 			k = strings.Replace(k, "[~]", "", -1)
-			if !strings.Contains(k, ".") {
-				k = "`" + k + "` "
-			}
+			k = processor.ProcessColumn(k) + " "
 			where += k + " LIKE ? "
 			v = "%" + ObjToStr(v) + "%"
 			res = append(res, v)
 		case "[!~]": // 左边任意
 			k = strings.Replace(k, "[!~]", "", -1)
-			if !strings.Contains(k, ".") {
-				k = "`" + k + "` "
-			}
+			k = processor.ProcessColumn(k) + " "
 			where += k + " LIKE ? "
 			v = "%" + ObjToStr(v) + ""
 			res = append(res, v)
 		case "[~!]": // 右边任意
 			k = strings.Replace(k, "[~!]", "", -1)
-			if !strings.Contains(k, ".") {
-				k = "`" + k + "` "
-			}
+			k = processor.ProcessColumn(k) + " "
 			where += k + " LIKE ? "
 			v = ObjToStr(v) + "%"
 			res = append(res, v)
 		case "[~~]": // 手动任意
 			k = strings.Replace(k, "[~~]", "", -1)
-			if !strings.Contains(k, ".") {
-				k = "`" + k + "` "
-			}
+			k = processor.ProcessColumn(k) + " "
 			where += k + " LIKE ? "
 			res = append(res, v)
 		default:
@@ -296,32 +277,24 @@ func (that *HoTimeDB) varCond(k string, v interface{}) (string, []interface{}) {
 			switch Substr(k, length-4, 4) {
 			case "[>=]":
 				k = strings.Replace(k, "[>=]", "", -1)
-				if !strings.Contains(k, ".") {
-					k = "`" + k + "` "
-				}
+				k = processor.ProcessColumn(k) + " "
 				where += k + ">=? "
 				res = append(res, v)
 			case "[<=]":
 				k = strings.Replace(k, "[<=]", "", -1)
-				if !strings.Contains(k, ".") {
-					k = "`" + k + "` "
-				}
+				k = processor.ProcessColumn(k) + " "
 				where += k + "<=? "
 				res = append(res, v)
 			case "[><]":
 				k = strings.Replace(k, "[><]", "", -1)
-				if !strings.Contains(k, ".") {
-					k = "`" + k + "` "
-				}
+				k = processor.ProcessColumn(k) + " "
 				where += k + " NOT BETWEEN ? AND ? "
 				vs := ObjToSlice(v)
 				res = append(res, vs[0])
 				res = append(res, vs[1])
 			case "[<>]":
 				k = strings.Replace(k, "[<>]", "", -1)
-				if !strings.Contains(k, ".") {
-					k = "`" + k + "` "
-				}
+				k = processor.ProcessColumn(k) + " "
 				where += k + " BETWEEN ? AND ? "
 				vs := ObjToSlice(v)
 				res = append(res, vs[0])
@@ -339,9 +312,8 @@ func (that *HoTimeDB) varCond(k string, v interface{}) (string, []interface{}) {
 
 // handleDefaultCondition 处理默认条件（带方括号但不是特殊操作符）
 func (that *HoTimeDB) handleDefaultCondition(k string, v interface{}, where string, res []interface{}) (string, []interface{}) {
-	if !strings.Contains(k, ".") {
-		k = "`" + k + "` "
-	}
+	processor := that.GetProcessor()
+	k = processor.ProcessColumn(k) + " "
 
 	if reflect.ValueOf(v).Type().String() == "common.Slice" || strings.Contains(reflect.ValueOf(v).Type().String(), "[]") {
 		vs := ObjToSlice(v)
@@ -369,9 +341,8 @@ func (that *HoTimeDB) handleDefaultCondition(k string, v interface{}, where stri
 
 // handlePlainField 处理普通字段（无方括号）
 func (that *HoTimeDB) handlePlainField(k string, v interface{}, where string, res []interface{}) (string, []interface{}) {
-	if !strings.Contains(k, ".") {
-		k = "`" + k + "` "
-	}
+	processor := that.GetProcessor()
+	k = processor.ProcessColumn(k) + " "
 
 	if v == nil {
 		where += k + " IS NULL "