feat(db): 添加对达梦数据库的支持

- 在应用程序中新增对达梦数据库（DM）的配置和连接支持
- 实现 SetDmDB 函数以配置达梦数据库连接
- 更新数据库操作逻辑，支持达梦特有的 SQL 语法和功能
- 在相关文件中添加达梦数据库的处理逻辑，包括表创建、数据插入和查询
- 更新 go.mod 和 go.sum 文件以引入达梦数据库驱动
- 增强文档，详细说明达梦数据库的配置和使用方法

example/app/mysql.go

@@ -0,0 +1,96 @@
+package app
+
+import (
+	. "code.hoteas.com/golang/hotime"
+	. "code.hoteas.com/golang/hotime/common"
+)
+
+// MysqlCtr MySQL 特有测试控制器
+var MysqlCtr = Ctr{
+	"tables": func(that *Context) {
+		if that.Db.Type != "mysql" {
+			that.Display(0, Map{"skip": true, "reason": "当前非 MySQL 数据库"})
+			return
+		}
+		tables := that.Db.Query("SHOW TABLES")
+		that.Display(0, Map{"tables": tables})
+	},
+
+	"describe": func(that *Context) {
+		if that.Db.Type != "mysql" {
+			that.Display(0, Map{"skip": true, "reason": "当前非 MySQL 数据库"})
+			return
+		}
+		tableName := that.Req.FormValue("table")
+		if tableName == "" {
+			that.Display(1, "请提供 table 参数")
+			return
+		}
+		columns := that.Db.Query("DESCRIBE " + tableName)
+		data := that.Db.Select(tableName, Map{"LIMIT": 10})
+		that.Display(0, Map{"table": tableName, "columns": columns, "sample_data": data})
+	},
+
+	"rawsql": func(that *Context) {
+		if that.Db.Type != "mysql" {
+			that.Display(0, Map{"skip": true, "reason": "当前非 MySQL 数据库"})
+			return
+		}
+		result := testMysqlRawSQL(that)
+		that.Display(0, result)
+	},
+}
+
+func testMysqlRawSQL(that *Context) Map {
+	result := Map{"name": "MySQL原生SQL测试", "tests": Slice{}}
+	tests := Slice{}
+
+	test1 := Map{"name": "Query 原生查询 (反引号)"}
+	articles1 := that.Db.Query("SELECT id, title, author FROM `article` WHERE state = ? LIMIT ?", 0, 5)
+	test1["result"] = len(articles1) >= 0
+	test1["count"] = len(articles1)
+	tests = append(tests, test1)
+
+	test2 := Map{"name": "Exec 原生执行 (反引号)"}
+	testArticle := that.Db.Get("article", "id", Map{"state": 0})
+	if testArticle != nil {
+		res, err := that.Db.Exec("UPDATE `article` SET modify_time = NOW() WHERE id = ?", testArticle.GetInt64("id"))
+		if err.GetError() == nil && res != nil {
+			affected, _ := res.RowsAffected()
+			test2["result"] = affected >= 0
+			test2["affected"] = affected
+		} else {
+			test2["result"] = false
+			test2["error"] = err.GetError()
+		}
+	} else {
+		test2["result"] = true
+		test2["note"] = "无可用测试数据"
+	}
+	tests = append(tests, test2)
+
+	test3 := Map{"name": "IN (?) 非空数组展开"}
+	articles3 := that.Db.Query("SELECT id, title FROM `article` WHERE id IN (?) LIMIT 10", []int{1, 2, 3, 4, 5})
+	test3["result"] = len(articles3) >= 0
+	test3["count"] = len(articles3)
+	test3["lastQuery"] = that.Db.LastQuery
+	tests = append(tests, test3)
+
+	test4 := Map{"name": "IN (?) 空数组替换为1=0"}
+	articles4 := that.Db.Query("SELECT id, title FROM `article` WHERE id IN (?) LIMIT 10", []int{})
+	test4["result"] = len(articles4) == 0
+	test4["count"] = len(articles4)
+	test4["lastQuery"] = that.Db.LastQuery
+	tests = append(tests, test4)
+
+	test5 := Map{"name": "NOT IN (?) 空数组替换为1=1"}
+	articles5 := that.Db.Query("SELECT id, title FROM `article` WHERE id NOT IN (?) LIMIT 10", []int{})
+	test5["result"] = len(articles5) > 0
+	test5["count"] = len(articles5)
+	test5["lastQuery"] = that.Db.LastQuery
+	tests = append(tests, test5)
+
+	result["tests"] = tests
+	result["success"] = true
+	return result
+}