数据库解耦源码

创建数据库接口：

namespace DataModels.IDBHandler
{
    /// <summary>
    /// 配置参数 数据库操作基类
    /// </summary>
    public interface IDBCreater
    {
        int Createtable();
    }
}

DBBase 类：

using System.Configuration;
using ToolsPakage;
namespace DataModels.IDBHandler
{
    public class DBBase
    {
        public static string ConnString = Security.DecryptDES(ConfigurationManager.AppSettings["dbConn"]);
    }
}

SqliteCreater:

public class SqliteCreater : IDBCreater
    {
        DbUtility utility;
        string path = AppDomain.CurrentDomain.BaseDirectory + "Alarm.db";
        string source = @"data source={0};version=3";
        public SqliteCreater()
        {
            DBBase.ConnString = string.Format(source,path);
            utility = new DbUtility();
        }
        public int Createtable()
        {
            if(File.Exists(path))
            {
                return 0;
            }
            try
            {
                if (!CreateTableConfigINFO())
                {
                    return -1;
                }
                if (!CreateTableCompanyInfo())
                {
                    return -1;
                }
                if (!CreateTableUserInfo())
                {
                    return -1;
                }
                if (!CreateTableLog())
                {
                    return -1;
                }
                if (!CreateTableOpratorFunction())
                {
                    return -1;
                }
                if (!CreateTableFacility())
                {
                    return -1;
                }
                if (!CreateTableContacts())
                {
                    return -1;
                }
                if (!InsertAdmin())
                {
                    return -1;
                }
                if(!CreateTableGroup())
                {
                    return -1;
                }
                return 1;
            }
            catch
            {
                return -1;
            }
        }
    }

DbUtility 类包含一下代码以及一些基本数据库操作代码（通用）:

public string ConnectionString { get; set; }
        private DbProviderFactory providerFactory;
        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="connectionString">数据库连接字符串</param>
        /// <param name="providerType">数据库类型枚举，参见<paramref name="providerType"/></param>
        public DbUtility()
        {
            ConnectionString = DBBase.ConnString;
            string privoder = System.Configuration.ConfigurationManager.AppSettings["dbPrivoder"];
            DbProviderType type = (DbProviderType)Enum.Parse(typeof(DbProviderType), privoder);
            providerFactory = ProviderFactory.GetDbProviderFactory(type);
            if (providerFactory == null)
            {
                throw new ArgumentException("Can‘t load DbProviderFactory for given value of providerType");
            }
        }

SqliteProvider:

public class SQLitePrivoder : DbProviderFactory
    {
        public override DbCommand CreateCommand()
        {
            DbCommand command = new SQLiteCommand();
            return command;
        }

        public override DbConnection CreateConnection()
        {
            DbConnection conn = new SQLiteConnection();
            return conn;
        }

        public override DbDataAdapter CreateDataAdapter()
        {
            DbDataAdapter ada = new SQLiteDataAdapter();
            return ada;
        }

        public override DbParameter CreateParameter()
        {
            DbParameter para = new SQLiteParameter();
            return para;
        }
    }

业务逻辑操作接口：

public interface ILogHandler
    {
        bool Add(TabLog model);
        bool Update(TabLog model);
        bool Delete(long ID);
        bool DeleteList(string IDlist, out int count);
        TabLog GetModel(long ID);
        TabLog DataRowToModel(DataRow row);
        DataTable GetLogDataSetByWhere(string where);
        DataTable GetDataTableByPage(int pageSize, int pageIndex, out int pageCount);
    }

业务逻辑实现：

public class TabLogHandler : ILogHandler
    {
        DbUtility utility;
        string path = AppDomain.CurrentDomain.BaseDirectory + "Alarm.db";
        string source = @"data source={0};version=3";
        public TabLogHandler()
        {
            DBBase.ConnString = string.Format(source, path);
            utility = new DbUtility();
        }

业务逻辑接口工厂:

/// <summary>
    /// 返回抽象处理接口
    /// </summary>
    public class HandlerFactory
    {
        static string privoder = System.Configuration.ConfigurationManager.AppSettings["dbPrivoder"];
        private static Dictionary<DbProviderType, IComInfoHandler> _comInfoDic = new Dictionary<DbProviderType, IComInfoHandler>();
        private static Dictionary<DbProviderType, IContractsHandler> _contractDic = new Dictionary<DbProviderType, IContractsHandler>();
        private static Dictionary<DbProviderType, IFacilityHandler> _facilityDic = new Dictionary<DbProviderType, IFacilityHandler>();
        private static Dictionary<DbProviderType, ILogHandler> _logDic = new Dictionary<DbProviderType, ILogHandler>();
        private static Dictionary<DbProviderType, IOperatorFunctionHandler> _operatorFunDic = new Dictionary<DbProviderType, IOperatorFunctionHandler>();
        private static Dictionary<DbProviderType, IOperatorHandler> _operatorDic = new Dictionary<DbProviderType, IOperatorHandler>();
        private static Dictionary<DbProviderType, IUserInfoHandler> _userInfoDic = new Dictionary<DbProviderType, IUserInfoHandler>();
        private static Dictionary<DbProviderType, IGroupHandler> _groupDic = new Dictionary<DbProviderType, IGroupHandler>();
        private static Dictionary<DbProviderType, IDBCreater> _dbCreateDic = new Dictionary<DbProviderType, IDBCreater>();

        private HandlerFactory()
        {

        }

        public static IComInfoHandler CreateComInfoHandler()
        {
            try
            {
                return (IComInfoHandler)_comInfoDic[(DbProviderType)Enum.Parse(typeof(DbProviderType), privoder)];
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        public static IContractsHandler CreateContractsHandler()
        {
            try
            {
                return (IContractsHandler)_contractDic[(DbProviderType)Enum.Parse(typeof(DbProviderType), privoder)];
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        public static IFacilityHandler CreateFacilityHandler()
        {
            try
            {
                return (IFacilityHandler)_facilityDic[(DbProviderType)Enum.Parse(typeof(DbProviderType), privoder)];
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        public static ILogHandler CreateLogHandler()
        {
            try
            {
                return (ILogHandler)_logDic[(DbProviderType)Enum.Parse(typeof(DbProviderType), privoder)];
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        public static IOperatorFunctionHandler CreateOperatorFunctionHandler()
        {
            try
            {
                return (IOperatorFunctionHandler)_operatorFunDic[(DbProviderType)Enum.Parse(typeof(DbProviderType), privoder)];
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        public static IOperatorHandler CreateOperatorHandler()
        {
            try
            {
                return (IOperatorHandler)_operatorDic[(DbProviderType)Enum.Parse(typeof(DbProviderType), privoder)];
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        public static IUserInfoHandler CreateUserInfoHandler()
        {
            try
            {
                return (IUserInfoHandler)_userInfoDic[(DbProviderType)Enum.Parse(typeof(DbProviderType), privoder)];
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        public static IGroupHandler CreateGroupHandler()
        {
            try
            {
                return (IGroupHandler)_groupDic[(DbProviderType)Enum.Parse(typeof(DbProviderType), privoder)];
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        public static IDBCreater CreateDBbyType()
        {
            try
            {
                return (IDBCreater)_dbCreateDic[(DbProviderType)Enum.Parse(typeof(DbProviderType), privoder)];
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        public static bool InitDBPrivoder()
        {
            try
            {
                #region Sqlite 映射

                _comInfoDic.Add(DbProviderType.SQLite, new DataModels.SqliteHandler.TabComInfoHandler());
                _contractDic.Add(DbProviderType.SQLite, new DataModels.SqliteHandler.TabContactsHandler());
                _facilityDic.Add(DbProviderType.SQLite, new DataModels.SqliteHandler.TabFacilityHandler());
                _logDic.Add(DbProviderType.SQLite, new DataModels.SqliteHandler.TabLogHandler());
                _operatorFunDic.Add(DbProviderType.SQLite, new DataModels.SqliteHandler.TabOperatorFunctionHandler());
                _operatorDic.Add(DbProviderType.SQLite, new DataModels.SqliteHandler.TabOperatorHandler());
                _userInfoDic.Add(DbProviderType.SQLite, new DataModels.SqliteHandler.TabUserInfoHandler());
                _dbCreateDic.Add(DbProviderType.SQLite, new DataModels.DBCreater.SqliteCreater());
                _groupDic.Add(DbProviderType.SQLite, new DataModels.SqliteHandler.TabGroupHandler());

                #endregion

                #region Mysql 映射

                _comInfoDic.Add(DbProviderType.MySql, new DataModels.MySqlHandler.TabComInfoHandler());
                _contractDic.Add(DbProviderType.MySql, new DataModels.MySqlHandler.TabContactsHandler());
                _facilityDic.Add(DbProviderType.MySql, new DataModels.MySqlHandler.TabFacilityHandler());
                _logDic.Add(DbProviderType.MySql, new DataModels.MySqlHandler.TabLogHandler());
                _operatorFunDic.Add(DbProviderType.MySql, new DataModels.MySqlHandler.TabOperatorFunctionHandler());
                _operatorDic.Add(DbProviderType.MySql, new DataModels.MySqlHandler.TabOperatorHandler());
                _userInfoDic.Add(DbProviderType.MySql, new DataModels.MySqlHandler.TabUserInfoHandler());
                _dbCreateDic.Add(DbProviderType.MySql, new DataModels.DBCreater.MySqlCreater());

                #endregion

                return true;
            }
            catch
            {
                return false;
            }
        }
    }
}

配置文件：