feat(database): 新增命令行参数解析、空值检查和数据库配置管理功能

- 实现了 command 包用于控制台参数和选项解析
- 添加了 empty 包提供变量空值/零值检查功能
- 集成了 Viper 库进行配置文件管理和环境变量支持
- 提供了数据库配置初始化和默认值设置功能
- 实现了配置值获取、设置和结构化解析方法
- 添加了服务器、数据库和JWT配置的便捷获取方法
- 实现了完整的数据库接口定义和事务管理功能

database/command/command.go

@@ -0,0 +1,135 @@
+// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
+//
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file,
+// You can obtain one at https://github.com/gogf/gf.
+//
+
+// Package command provides console operations, like options/arguments reading.
+package command
+
+import (
+	"os"
+	"regexp"
+	"strings"
+)
+
+var (
+	defaultParsedArgs    = make([]string, 0)
+	defaultParsedOptions = make(map[string]string)
+	argumentOptionRegex  = regexp.MustCompile(`^\-{1,2}([\w\?\.\-]+)(=){0,1}(.*)$`)
+)
+
+// Init does custom initialization.
+func Init(args ...string) {
+	if len(args) == 0 {
+		if len(defaultParsedArgs) == 0 && len(defaultParsedOptions) == 0 {
+			args = os.Args
+		} else {
+			return
+		}
+	} else {
+		defaultParsedArgs = make([]string, 0)
+		defaultParsedOptions = make(map[string]string)
+	}
+	// Parsing os.Args with default algorithm.
+	defaultParsedArgs, defaultParsedOptions = ParseUsingDefaultAlgorithm(args...)
+}
+
+// ParseUsingDefaultAlgorithm parses arguments using default algorithm.
+func ParseUsingDefaultAlgorithm(args ...string) (parsedArgs []string, parsedOptions map[string]string) {
+	parsedArgs = make([]string, 0)
+	parsedOptions = make(map[string]string)
+	for i := 0; i < len(args); {
+		array := argumentOptionRegex.FindStringSubmatch(args[i])
+		if len(array) > 2 {
+			if array[2] == "=" {
+				parsedOptions[array[1]] = array[3]
+			} else if i < len(args)-1 {
+				if len(args[i+1]) > 0 && args[i+1][0] == '-' {
+					// Example: gf gen -d -n 1
+					parsedOptions[array[1]] = array[3]
+				} else {
+					// Example: gf gen -n 2
+					parsedOptions[array[1]] = args[i+1]
+					i += 2
+					continue
+				}
+			} else {
+				// Example: gf gen -h
+				parsedOptions[array[1]] = array[3]
+			}
+		} else {
+			parsedArgs = append(parsedArgs, args[i])
+		}
+		i++
+	}
+	return
+}
+
+// GetOpt returns the option value named `name`.
+func GetOpt(name string, def ...string) string {
+	Init()
+	if v, ok := defaultParsedOptions[name]; ok {
+		return v
+	}
+	if len(def) > 0 {
+		return def[0]
+	}
+	return ""
+}
+
+// GetOptAll returns all parsed options.
+func GetOptAll() map[string]string {
+	Init()
+	return defaultParsedOptions
+}
+
+// ContainsOpt checks whether option named `name` exist in the arguments.
+func ContainsOpt(name string) bool {
+	Init()
+	_, ok := defaultParsedOptions[name]
+	return ok
+}
+
+// GetArg returns the argument at `index`.
+func GetArg(index int, def ...string) string {
+	Init()
+	if index < len(defaultParsedArgs) {
+		return defaultParsedArgs[index]
+	}
+	if len(def) > 0 {
+		return def[0]
+	}
+	return ""
+}
+
+// GetArgAll returns all parsed arguments.
+func GetArgAll() []string {
+	Init()
+	return defaultParsedArgs
+}
+
+// GetOptWithEnv returns the command line argument of the specified `key`.
+// If the argument does not exist, then it returns the environment variable with specified `key`.
+// It returns the default value `def` if none of them exists.
+//
+// Fetching Rules:
+// 1. Command line arguments are in lowercase format, eg: gf.package.variable;
+// 2. Environment arguments are in uppercase format, eg: GF_PACKAGE_VARIABLE；
+func GetOptWithEnv(key string, def ...string) string {
+	cmdKey := strings.ToLower(strings.ReplaceAll(key, "_", "."))
+	if ContainsOpt(cmdKey) {
+		return GetOpt(cmdKey)
+	} else {
+		envKey := strings.ToUpper(strings.ReplaceAll(key, ".", "_"))
+		if r, ok := os.LookupEnv(envKey); ok {
+			return r
+		} else {
+			if len(def) > 0 {
+				return def[0]
+			}
+		}
+	}
+	return ""
+}