WPF或者winform快速使用SQLite

1、在项目工程中，打开NuGet然后搜索Stub.System.Data.SQLite.Core.NetFramework。
2、搜索到后开始安装。安装完成后项目引用中就出现System.data.sqlite,这时候就可以用了。
3、使用下面的代码作为一个数据库帮助类，快速使用是Sqlite数据库。（该方法在wpf和winform均测试过）

 public class DataBaseHelp
    {
        /// 

        /// 链接套接字
        /// 
        static SQLiteConnection m_dbConnection { get; set; }

        /// 

        /// 生成连接字符串
        /// 
        /// 
        private static string CreateConnectionString(string db)
        {
            SQLiteConnectionStringBuilder connectionString = new SQLiteConnectionStringBuilder();
            connectionString.DataSource = @"data/" + db;//此处文件名可以使用变量表示
            string conStr = connectionString.ToString();
            return conStr;
        }

        /// 

        /// 连接到数据库
        /// 
        /// 
        private static SQLiteConnection dbConnection(string db)
        {
            m_dbConnection = new SQLiteConnection(CreateConnectionString(db));
            m_dbConnection.Open();
            return m_dbConnection;
        }

        /// 

        /// 创建数据库文件,如：text.db
        /// 
        /// 文件名
        public static void CreateDBFile(string fileName)
        {
            string path = Environment.CurrentDirectory + @"/Data/";
            if (!Directory.Exists(path))
            {
                Directory.CreateDirectory(path);
            }
            string databaseFileName = path + fileName;
            if (!File.Exists(databaseFileName))
            {
                SQLiteConnection.CreateFile(databaseFileName);
            }
        }

        /// 

        /// 在指定数据库中创建一个table
        /// 如：create table mytab (ID INT PRIMARY KEY NOT NULL, text TEXT NOT NULL);
        /// 
        /// 
        /// 
        public static bool CreateTable(string db, string sql)
        {
            try
            {
                SQLiteCommand command = new SQLiteCommand(sql, dbConnection(db));
                command.ExecuteNonQuery();
                return true;
            }
            catch (Exception ex)
            {
                Console.WriteLine("ExecuteNonQuery(" + sql + ")Err:" + ex);
                return false;
            }
            finally
            {
                closeConn();
            }
        }

        /// 

        /// 返回记录集查询
        /// 
        /// sql查询语言
        /// 返回查询结果集
        public static DataTable SqlTable(string db, string sql)
        {
            try
            {
                SQLiteCommand sqlcmd = new SQLiteCommand(sql, dbConnection(db));//sql语句
                sqlcmd.CommandTimeout = 120;
                SQLiteDataReader reader = sqlcmd.ExecuteReader();
                DataTable dt = new DataTable();
                if (reader != null)
                {
                    dt.Load(reader, LoadOption.PreserveChanges, null);
                }
                return dt;
            }
            catch (Exception ex)
            {
                Console.WriteLine("SqlReader(" + sql + ")Err:" + ex);
                return null;
            }
            finally
            {
                closeConn();
            }
        }

        /// 

        /// 执行增删改查操作
        /// 
        /// 查询语言
        /// 
        public static int ExecuteNonQuery(string db, string sql)
        {
            try
            {
                SQLiteCommand cmd;
                cmd = new SQLiteCommand(sql, dbConnection(db));
                cmd.ExecuteNonQuery().ToString();
                return 1;
            }
            catch (Exception ex)
            {
                string chejnji="ExecuteNonQuery(" + sql + ")Err:" + ex.Message;
                var strDateInfo = "出现应用程序未处理的异常：" + DateTime.Now + "\r\n";
                var str = string.Format(strDateInfo + "异常类型：{0}\r\n异常消息：{1}\r\n异常信息：{2}\r\n",
                              ex.GetType().Name, ex.Message, ex.StackTrace);


                WriteLog(str+ chejnji);//日志写入
                return 0;
            }
            finally
            {
                closeConn();
            }
        }
        static void WriteLog(string str)
        {
            if (!Directory.Exists("ErrLog"))
            {
                Directory.CreateDirectory("ErrLog");
            }
            string CreateTime = DateTime.Now.ToString("yyyy-MM");


            using (var sw = new StreamWriter("ErrLog\\" + CreateTime + ".txt", true))
            {
                sw.WriteLine(str);
                sw.WriteLine("---------------------------------------------------------");
                sw.Close();
            }

        }
        /// 

        /// 删除数据库
        /// 
        /// 文件名
        public static void DeleteDBFile(string fileName)
        {
            string path = Environment.CurrentDirectory + @"/Data/" + fileName;
            if (File.Exists(path))
            {
                File.Delete(path);
            }
        }
        /// 

        /// 在指定数据库中删除一个table
        /// 
        /// 表名称
        /// 
        public static bool DeleteTable(string db, string tablename)
        {
            try
            {
                SQLiteCommand cmd = new SQLiteCommand("DROP TABLE IF EXISTS " + tablename, dbConnection(db));
                cmd.ExecuteNonQuery();
                return true;
            }
            catch (Exception ex)
            {
                Console.WriteLine("ExecuteNonQuery(DROP TABLE IF EXISTS " + tablename + ")Err:" + ex);
                return false;
            }
            finally
            {
                closeConn();
            }
        }
        /// 

        /// 返回一条记录查询
        /// 
        /// sql查询语言
        /// 返回字符串数组
        public static List<string> SqlRow(string db, string sql)
        {
            try
            {
                SQLiteCommand sqlcmd = new SQLiteCommand(sql, dbConnection(db));//sql语句
                SQLiteDataReader reader = sqlcmd.ExecuteReader();
                if (!reader.Read())
                {
                    return null;
                }
                List<string> Row = new List<string>();
                for (int i = 0; i < reader.FieldCount; i++)
                {
                    Row.Add(reader[i].ToString());
                }
                reader.Close();
                return Row;
            }
            catch (Exception ex)
            {
                Console.WriteLine("SqlRow(" + sql + ")Err:" + ex);
                return null;
            }
            finally
            {
                closeConn();
            }
        }

        /// 

        /// 在指定表中添加列
        /// 
        /// 表名
        /// 列名
        /// 列的数值类型
        /// 
        public static bool AddColumn(string db, string tablename, string columnname, string ctype)
        {
            try
            {
                SQLiteCommand cmd = new SQLiteCommand("ALTER TABLE " + tablename + " ADD COLUMN " + columnname + " " + ctype, dbConnection(db));
                cmd.ExecuteNonQuery();
                return true;
            }
            catch (Exception ex)
            {
                Console.WriteLine("ExecuteNonQuery(ALTER TABLE " + tablename + " ADD COLUMN " + columnname + " " + ctype + ")Err:" + ex);
                return false;
            }
            finally
            {
                closeConn();
            }
        }

        /// 

        /// 唯一结果查询
        /// 
        /// sql查询语言
        /// 返回一个字符串
        public static string sqlone(string db, string sql)
        {
            try
            {
                SQLiteCommand sqlcmd = new SQLiteCommand(sql, dbConnection(db));//sql语句
                return sqlcmd.ExecuteScalar().ToString();
            }
            catch
            {
                return "";
            }
            finally
            {
                closeConn();
            }
        }

        /// 

        /// 获取一列数据
        /// 
        /// 单列查询
        /// 返回结果数量
        /// 返回一个数组
        public static List<string> sqlcolumn(string db, string sql)
        {
            try
            {
                List<string> Column = new List<string>();
                SQLiteCommand sqlcmd = new SQLiteCommand(sql, dbConnection(db));//sql语句
                SQLiteDataReader reader = sqlcmd.ExecuteReader();
                while (reader.Read())
                {
                    Column.Add(reader[0].ToString());
                }
                reader.Close();
                return Column;
            }
            catch (Exception ex)
            {
                Console.WriteLine("sqlcolumn(" + sql + ")Err:" + ex);
                return null;
            }
            finally
            {
                closeConn();
            }
        }

        /// 

        /// 关闭数据库连接
        /// 
        public static void closeConn()
        {
            try
            {
                if (m_dbConnection.State == ConnectionState.Open)
                    m_dbConnection.Close();
                else if (m_dbConnection.State == ConnectionState.Broken)
                {
                    m_dbConnection.Close();
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("closeConnErr:" + ex);
            }
        }

    }