C#关于sqlite数据库问题,大神来看看 10C
 namespace QQLite.GuessFeng
{
    /// <summary> 
    /// 说明:这是一个针对System.Data.SQLite的数据库常规操作封装的通用类。 
    /// 更新时间:2014-10-31
    /// </summary>    
    public class SQLiteDBHelper//SQLiteDBHelper
    {
        public static string DataSource = string.Format("Data Source={0};Pooling=true;FailIfMissing=false", Path.Combine(D:\\, "GuessFeng.db"));
        public static string dbpath = D:\\ + "GuessFeng.db";
        private string connectionString = string.Empty;

        #region 数据库连接必要条件参数

        private SQLiteConnection dbConnection = null;
        /// <summary>
        /// 数据库连接
        /// </summary>
        public SQLiteConnection DbConnection
        {
            get
            {
                if (this.dbConnection == null)
                {
                    // 若没打开,就变成自动打开关闭的
                    this.Open();
                    this.AutoOpenClose = true;
                }
                return this.dbConnection;
            }
            set
            {
                this.dbConnection = value;
            }
        }
        private SQLiteCommand dbCommand = null;
        /// <summary>
        /// 命令
        /// </summary>
        public SQLiteCommand DbCommand
        {
            get
            {
                return this.dbCommand;
            }
            set
            {
                this.dbCommand = value;
            }
        }
        private SQLiteDataAdapter dbDataAdapter = null;
        /// <summary>
        /// 数据库适配器
        /// </summary>
        public SQLiteDataAdapter DbDataAdapter
        {
            get
            {
                return this.dbDataAdapter;
            }
            set
            {
                this.dbDataAdapter = value;
            }
        }

        /// <summary>
        /// 数据库连接
        /// </summary>
        public string ConnectionString
        {
            get
            {
                return this.connectionString;
            }
            set
            {
                this.connectionString = value;
            }
        }

        private SQLiteTransaction dbTransaction = null;
        private bool inTransaction = false;
        /// <summary>
        /// 是否已采用事务
        /// </summary>
        public bool InTransaction
        {
            get
            {
                return this.inTransaction;
            }
            set
            {
                this.inTransaction = value;
            }
        }
        private bool autoOpenClose = false;
        /// <summary>
        /// 默认打开关闭数据库选项(默认为否)
        /// </summary>
        public bool AutoOpenClose
        {
            get
            {
                return autoOpenClose;
            }
            set
            {
                autoOpenClose = value;
            }
        }

        #endregion


        /// <summary> 
        /// 构造函数 
        /// </summary> 
        /// <param name="dbPath">SQLite数据库文件路径</param> 
        public SQLiteDBHelper()
        {
            // string dbPath = Client.BasePath + @"QQ\" + Client.QQ + @"\DataBase\QQLite.Plugin.VipwarrantPlugin.db";
            this.connectionString = DataSource;
        }
        /// <summary>
        /// 这时主要的获取数据库连接的方法
        /// </summary>
        /// <returns>数据库连接</returns>
        public IDbConnection Open()
        {
            this.Open(this.ConnectionString);
            return this.dbConnection;
        }

        /// <summary>
        /// 获得新的数据库连接
        /// </summary>
        /// <param name="connectionString">数据库连接字符串</param>
        /// <returns>数据库连接</returns>
        public IDbConnection Open(string connectionString)
        {
            // 若是空的话才打开
            if (this.dbConnection == null || this.dbConnection.State == ConnectionState.Closed)
            {
                this.ConnectionString = connectionString;
                this.dbConnection = new SQLiteConnection(this.ConnectionString);
                this.dbConnection.Open();
            }

            this.AutoOpenClose = false;
            return this.dbConnection;
        }

        #region 建立本地数据库

        /// <summary> 
        /// 创建SQLite数据库文件 
        /// </summary> 
        /// <param name="dbPath">要创建的SQLite数据库文件路径</param> 
        public void CreateDB()
        {
            if (!File.Exists(dbpath))
            {
                // 自动打开
                if (this.DbConnection == null)
                {
                    this.AutoOpenClose = true;
                    this.Open();
                }
                else if (this.DbConnection.State == ConnectionState.Closed)
                {
                    this.Open();
                }
                this.dbCommand = this.DbConnection.CreateCommand();
                this.dbCommand.CommandText =
                    "CREATE TABLE [DBVersion] ([Version] NVARCHAR(50)  NULL);INSERT INTO [DBVersion] (Version) values('4.0.0.0');CREATE TABLE [RanNum] ([Id] INTEGER PRIMARY KEY NOT NULL,[ExternalId] INTEGER NOT NULL,[Num] INTEGER NOT NULL,[LastQQ]INTEGER NULL);CREATE TABLE [Config] ([Id] INTEGER PRIMARY KEY NOT NULL,[Fix] TEXT NULL,[Open] INTEGER NOT NULL,[Deduct] INTEGER NOT NULL,[Award] INTEGER NOT NULL);INSERT INTO [Config] (Fix,Open,Deduct,Award) values('#',10,5,100);CREATE TABLE [Lock] ([Id] INTEGER PRIMARY KEY NOT NULL,[value] TEXT NULL);";
                this.dbCommand.ExecuteNonQuery();
                //this.dbCommand.CommandText = "DROP TABLE Demo";
                //this.dbCommand.ExecuteNonQuery();
            }
        }

        #endregion

        /// <summary> 
        /// 对SQLite数据库执行增删改操作,返回受影响的行数。 
        /// </summary> 
        /// <param name="commandText">要执行的增删改的SQL语句</param> 
        /// <param name="parameters">执行增删改语句所需要的参数,参数必须以它们在SQL语句中的顺序为准</param> 
        /// <returns></returns> 
        public int ExecuteNonQuery(string commandText, SQLiteParameter[] parameters)
        {
            // 自动打开
            if (this.DbConnection == null)
            {
                this.AutoOpenClose = true;
                this.Open();
            }
            else if (this.DbConnection.State == ConnectionState.Closed)
            {
                this.Open();
            }
            this.dbCommand = this.DbConnection.CreateCommand();
            this.dbCommand.CommandText = commandText;
            if (this.dbTransaction != null)
            {
                this.dbCommand.Transaction = this.dbTransaction;
            }
            if (parameters != null)
            {
                this.dbCommand.Parameters.Clear();
                for (int i = 0; i < parameters.Length; i++)
                {
                    this.dbCommand.Parameters.Add(parameters[i]);
                }
            }
            int returnValue = this.dbCommand.ExecuteNonQuery();
            // 自动关闭           
            this.dbCommand.Parameters.Clear();
            // 自动关闭
            //if (this.AutoOpenClose)
            //{
            //    this.Close();
            //}
            return returnValue;
        }

        #endregion

        #region public void Close() 关闭数据库连接
        /// <summary>
        /// 关闭数据库连接
        /// </summary>
        public void Close()
        {
            if (this.dbConnection != null)
            {
                this.dbConnection.Close();
                this.dbConnection.Dispose();
            }

            this.Dispose();
        }
        #endregion

        #region public void Dispose() 内存回收
        /// <summary>
        /// 内存回收
        /// </summary>
        public void Dispose()
        {
            if (this.dbCommand != null)
            {
                this.dbCommand.Dispose();
            }
            if (this.dbDataAdapter != null)
            {
                this.dbDataAdapter.Dispose();
            }
            this.dbConnection = null;
        }
        #endregion

    }
}
         private void button1_Click(object sender, EventArgs e)
        {
            SQLiteDBHelper vdb = new SQLiteDBHelper();//初始化SQLite数据库
            string sql = "UPDATE Config SET Fix=@Fix,Open=@Open,Deduct=@Deduct,Award=@Award WHERE (Id=1)";//修改语句
            SQLiteParameter[] Config = new SQLiteParameter[]{
                new SQLiteParameter("@Fix",text_Fix.Text ),
                new SQLiteParameter ("@Open",text_Open.Text ),
                new SQLiteParameter("@Deduct",text_Deduct.Text ),
                new SQLiteParameter("@Award",text_Award.Text )
            };
            //MessageBox.Show("保存成功!");
            if (vdb.ExecuteNonQuery(sql, Config) > 0)
            {
                MessageBox.Show("保存成功!");
            }
        }

为什么点击按钮保存,一点就卡死

3个回答

也不报错,就是卡的不动,等一二分钟就好了,但是保存不了

你的SqlHelper写的很乱 为什么不可以在用的时候创建连接,用完之后立即关闭呢 而且你的连接对象new了吗
if (this.DbConnection == null)
{
this.AutoOpenClose = true;
this.Open();
}

                    你的代码中并没有new 
a7478729
a7478729 这个类,我也是在网上找的,初学者
4 年多之前 回复
a7478729
a7478729 肯定实例化了
4 年多之前 回复

关注我博客 加我qq 812647756 我给你一个sqlite 的SqlHelper . 看见这么烂的代码就生气

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