SQLite操作公共类

    /// <summary>
    /// Copyright (C) ZYY
    /// 数据访问基础类(基于SQLite)
    /// </summary>
    public class DbHelperSqlite
    {
        /// <summary>
        /// 提示信息
        /// </summary>
        public static string StrLastError = string.Empty;

        /// <summary>
        /// 命令
        /// </summary>
        public enum SdaCmd
        {
            /// <summary>
            /// 查询
            /// </summary>
            Select,/// <summary>
            /// 删除
            /// </summary>
            Delete,/// <summary>
            /// 更新
            /// </summary>
            Update,/// <summary>
            /// 插入
            /// </summary>
            Insert
        }

        /// <summary>
        /// 连接字符串
        /// </summary>
        /// <value>
        /// The connection string.
        /// </value>
        public static string ConnString { get; set; } = "";

        /// <summary>
        /// 创建数据库文件及数据库表
        /// </summary>
        /// <param name="strDbpath">数据库文件包含文件名的全路径信息</param>
        /// <param name="sql">创建数据库表的SQL语句</param>
        public static void CreateDbTable(string strDbpath,string sql)
        {
            if (!File.Exists(strDbpath))
            {
                ConnString = $"Data Source={strDbpath};Pooling=false;FailIfMissing=false";
                SQLiteConnection conn = new SQLiteConnection(ConnString);
                SQLiteCommand cmd = new SQLiteCommand();
                conn.Open();
                cmd.CommandText = sql;
                cmd.Connection = conn;
                cmd.ExecuteNonQuery();
                conn.Close();
                FileInfo fileInfo = new FileInfo(strDbpath);
                if (fileInfo.Length == 0)
                {
                    File.Delete(strDbpath);
                    conn = new SQLiteConnection(ConnString);
                    cmd = new SQLiteCommand();
                    conn.Open();
                    cmd.CommandText = sql;
                    cmd.Connection = conn;
                    cmd.ExecuteNonQuery();
                    conn.Close();
                }
            }
            else
            {
                ConnString = $"Data Source={strDbpath};Pooling=false;FailIfMissing=false";
            }
        }

        /// <summary>
        /// DataAdapter方法 返回DataSet数据集
        /// </summary>
        /// <param name="sSqlCmd">SQL语句</param>
        /// <param name="command">操作参数 枚举类型</param>
        /// <param name="tabName">DataSet中的表名</param>
        /// <param name="paraList">命令参数集合</param>
        /// <returns></returns>
        public static DataSet DataAdapter(string sSqlCmd,SdaCmd command,string tabName,params SQLiteParameter[] paraList)
        {
            DataSet ds = new DataSet();
            try
            {
                SQLiteConnection con = new SQLiteConnection(ConnString);
                SQLiteCommand cmd = new SQLiteCommand
                {
                    Connection = con,CommandText = sSqlCmd
                };
                if (paraList != null)
                {
                    cmd.CommandType = CommandType.Text;
                    foreach (SQLiteParameter para in paraList)
                    {
                        cmd.Parameters.Add(para);
                    }
                }
                SQLiteDataAdapter sda = new SQLiteDataAdapter();
                switch (command)
                {
                    case SdaCmd.Select:
                        sda.SelectCommand = cmd;
                        break;
                    case SdaCmd.Insert:
                        sda.InsertCommand = cmd;
                        break;
                    case SdaCmd.Update:
                        sda.UpdateCommand = cmd;
                        break;
                    case SdaCmd.Delete:
                        sda.DeleteCommand = cmd;
                        break;
                }
                sda.Fill(ds,tabName);
                con.Close();
                SQLiteConnection.ClearAllPools();
            }
            catch (Exception ex)
            {
                StrLastError = ex.Message;
            }
            return ds;
        }

        /// <summary>
        /// 执行一个查询语句，返回一个包含查询结果的DataTable
        /// </summary>
        /// <param name="strSql">要执行的查询语句</param>
        /// <param name="parameters">执行SQL查询语句所需要的参数，参数必须以它们在SQL语句中的顺序为准</param>
        /// <returns></returns>
        public static DataTable ExecuteDataTable(string strSql,SQLiteParameter[] parameters)
        {
            try
            {
                using (SQLiteConnection connection = new SQLiteConnection(ConnString))
                {
                    using (SQLiteCommand command = new SQLiteCommand(strSql,connection))
                    {
                        if (parameters != null)
                        {
                            command.Parameters.AddRange(parameters);
                        }
                        SQLiteDataAdapter adapter = new SQLiteDataAdapter(command);
                        DataTable data = new DataTable();
                        adapter.Fill(data);
                        SQLiteConnection.ClearAllPools();
                        return data;
                    }
                }
            }
            catch (Exception ex)
            {
                StrLastError = ex.Message;
                return null;
            }
        }

        /// <summary>
        /// 执行一个查询语句，返回一个包含查询结果的DataTable
        /// </summary>
        /// <param name="strSql">要执行的查询语句</param>
        /// <returns></returns>
        public static DataTable ExecuteDataTable(string strSql)
        {
            try
            {
                using (SQLiteConnection connection = new SQLiteConnection(ConnString))
                {
                    using (SQLiteCommand command = new SQLiteCommand(strSql,connection))
                    {
                        SQLiteDataAdapter adapter = new SQLiteDataAdapter(command);
                        DataTable data = new DataTable("ResultData");
                        adapter.Fill(data);
                        SQLiteConnection.ClearAllPools();
                        return data;
                    }
                }
            }
            catch (Exception ex)
            {
                StrLastError = ex.Message;
                return null;
            }
        }

        /// <summary>
        /// 对SQLite数据库执行增删改操作，返回受影响的行数。
        /// </summary>
        /// <param name="strSql">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 static int ExecuteNonQuery(string strSql,SQLiteParameter[] parameters)
        {
            try
            {
                int affectedRows;
                using (SQLiteConnection connection = new SQLiteConnection(ConnString))
                {
                    connection.Open();
                    using (DbTransaction transaction = connection.BeginTransaction())
                    {
                        using (SQLiteCommand command = new SQLiteCommand(connection))
                        {
                            command.CommandText = strSql;
                            if (parameters != null && parameters.Length > 0)
                            {
                                command.Parameters.AddRange(parameters);
                            }
                            affectedRows = command.ExecuteNonQuery();
                        }
                        transaction.Commit();
                    }
                }
                SQLiteConnection.ClearAllPools();
                return affectedRows;
            }
            catch (Exception ex)
            {
                StrLastError = ex.Message;
                return 0;
            }
        }

        /// <summary>
        /// 对SQLite数据库执行增删改操作，返回受影响的行数。
        /// </summary>
        /// <param name="strSql">要执行的增删改的SQL语句</param>
        /// <returns></returns>
        public static int ExecuteNonQuery(string strSql)
        {
            try
            {
                int affectedRows;
                using (SQLiteConnection connection = new SQLiteConnection(ConnString))
                {
                    connection.Open();
                    using (DbTransaction transaction = connection.BeginTransaction())
                    {
                        using (SQLiteCommand command = new SQLiteCommand(connection))
                        {
                            command.CommandText = strSql;
                            affectedRows = command.ExecuteNonQuery();
                        }
                        transaction.Commit();
                    }
                }
                SQLiteConnection.ClearAllPools();
                return affectedRows;
            }
            catch (Exception ex)
            {
                StrLastError = ex.Message;
                return 0;
            }
        }

        /// <summary>
        /// 执行一个查询语句，返回一个关联的SQLiteDataReader实例
        /// </summary>
        /// <param name="strSql">要执行的查询语句</param>
        /// <param name="parameters">执行SQL查询语句所需要的参数，参数必须以它们在SQL语句中的顺序为准</param>
        /// <returns></returns>
        public static SQLiteDataReader ExecuteReader(string strSql,SQLiteParameter[] parameters)
        {
            try
            {
                using (SQLiteConnection connection = new SQLiteConnection(ConnString))
                {
                    SQLiteCommand command = new SQLiteCommand(strSql,connection);
                    if (parameters != null)
                    {
                        command.Parameters.AddRange(parameters);
                    }
                    connection.Open();
                    return command.ExecuteReader(CommandBehavior.CloseConnection);
                }
            }
            catch (Exception ex)
            {
                StrLastError = ex.Message;
                return null;
            }
        }

        /// <summary>
        /// 执行一个查询语句，返回一个关联的SQLiteDataReader实例
        /// </summary>
        /// <param name="strSql">要执行的查询语句</param>
        /// <returns></returns>
        public static SQLiteDataReader ExecuteReader(string strSql)
        {
            try
            {
                using (SQLiteConnection connection = new SQLiteConnection(ConnString))
                {
                    SQLiteCommand command = new SQLiteCommand(strSql,connection);
                    connection.Open();
                    return command.ExecuteReader(CommandBehavior.CloseConnection);
                }
            }
            catch (Exception ex)
            {
                StrLastError = ex.Message;
                return null;
            }
        }

        /// <summary>
        /// 执行一个查询语句，返回查询结果的第一行第一列
        /// </summary>
        /// <param name="strSql">要执行的查询语句</param>
        /// <param name="parameters">执行SQL查询语句所需要的参数，参数必须以它们在SQL语句中的顺序为准</param>
        /// <returns></returns>
        public static object ExecuteScalar(string strSql,connection))
                    {
                        if (parameters != null)
                        {
                            command.Parameters.AddRange(parameters);
                        }
                        SQLiteDataAdapter adapter = new SQLiteDataAdapter(command);
                        DataTable data = new DataTable();
                        adapter.Fill(data);
                        SQLiteConnection.ClearAllPools();
                        return data;
                    }
                }
            }
            catch (Exception ex)
            {
                StrLastError = ex.Message;
                return null;
            }
        }

        /// <summary>
        /// 执行一个查询语句，返回查询结果的第一行第一列
        /// </summary>
        /// <param name="strSql">要执行的查询语句</param>
        /// <returns></returns>
        public static object ExecuteScalar(string strSql)
        {
            try
            {
                using (SQLiteConnection connection = new SQLiteConnection(ConnString))
                {
                    using (SQLiteCommand command = new SQLiteCommand(strSql,connection))
                    {
                        SQLiteDataAdapter adapter = new SQLiteDataAdapter(command);
                        DataTable data = new DataTable();
                        adapter.Fill(data);
                        SQLiteConnection.ClearAllPools();
                        return data;
                    }
                }
            }
            catch (Exception ex)
            {
                StrLastError = ex.Message;
                return null;
            }
        }

        /// <summary>
        /// 执行多条SQL语句，实现数据库事务。
        /// </summary>
        /// <param name="sqlStringList">SQL语句的哈希表（key为strSql语句，value是该语句的SQLiteParameter[]）</param>
        /// <returns></returns>
        public static bool ExecuteSqlTran(Hashtable sqlStringList)
        {
            SQLiteConnection conn = new SQLiteConnection(ConnString);
            conn.Open();
            using (SQLiteTransaction trans = conn.BeginTransaction())
            {
                SQLiteCommand cmd = new SQLiteCommand();
                try
                {
                    foreach (DictionaryEntry myDe in sqlStringList)
                    {
                        string cmdText = myDe.Key.ToString();
                        SQLiteParameter[] cmdParms = (SQLiteParameter[]) myDe.Value;
                        PrepareCommand(cmd,conn,trans,cmdText,cmdParms);
                        cmd.ExecuteNonQuery();
                        cmd.Parameters.Clear();
                    }
                    trans.Commit();
                    return true;
                }
                catch (Exception ex)
                {
                    trans.Rollback();
                    StrLastError = ex.Message;
                    return false;
                }
                finally
                {
                    conn.Close();
                }
            }
        }

        /// <summary>
        /// 执行压缩数据库
        /// </summary>
        public static void ExecuteZip()
        {
            using (SQLiteConnection connection = new SQLiteConnection(ConnString))
            {
                using (SQLiteCommand cmd = new SQLiteCommand("VACUUM",connection))
                {
                    try
                    {
                        connection.Open();
                        cmd.ExecuteNonQuery();
                    }
                    catch (SQLiteException e)
                    {
                        connection.Close();
                        StrLastError = e.Message;
                    }
                }
            }
        }

        /// <summary>
        /// 取dataset
        /// </summary>
        /// <param name="strSql">strSql语句</param>
        /// <returns>
        /// 返回dataset
        /// </returns>
        public static DataSet GetDataSet(string strSql)
        {
            DataSet ds = null;
            try
            {
                SQLiteConnection conn = new SQLiteConnection(ConnString);
                conn.Open();
                SQLiteCommand cmd = new SQLiteCommand
                {
                    CommandText = strSql,Connection = conn
                };
                SQLiteDataAdapter dao = new SQLiteDataAdapter(cmd);
                ds = new DataSet();
                dao.Fill(ds);
                conn.Close();
            }
            catch (Exception ex)
            {
                StrLastError = ex.Message;
            }
            finally
            {
                SQLiteConnection.ClearAllPools();
            }
            return ds;
        }

        /// <summary>
        /// 取dataset
        /// </summary>
        /// <param name="strSql">strSql语句</param>
        /// <param name="paraList">命令参数集合</param>
        /// <returns>
        /// 返回dataset
        /// </returns>
        public static DataSet GetDataSet(string strSql,params SQLiteParameter[] paraList)
        {
            DataSet ds = null;
            try
            {
                SQLiteConnection conn = new SQLiteConnection(ConnString);
                conn.Open();
                SQLiteCommand cmd = new SQLiteCommand
                {
                    CommandText = strSql
                };
                if (paraList != null && paraList.Length > 0)
                {
                    cmd.Parameters.AddRange(paraList);
                }
                cmd.Connection = conn;
                SQLiteDataAdapter dao = new SQLiteDataAdapter(cmd);
                ds = new DataSet();
                dao.Fill(ds);
                conn.Close();
            }
            catch (Exception ex)
            {
                StrLastError = ex.Message;
            }
            finally
            {
                SQLiteConnection.ClearAllPools();
            }
            return ds;
        }

        /// <summary>
        /// 取datatable
        /// </summary>
        /// <param name="strSql">SQL语句</param>
        /// <returns>
        /// 返回DataTable
        /// </returns>
        public static DataTable GetDataTable(string strSql)
        {
            DataTable dt = null;
            try
            {
                SQLiteConnection conn = new SQLiteConnection(ConnString);
                conn.Open();
                SQLiteCommand cmd = new SQLiteCommand
                {
                    CommandText = strSql,Connection = conn
                };
                SQLiteDataAdapter dao = new SQLiteDataAdapter(cmd);
                dt = new DataTable();
                dao.Fill(dt);
                conn.Close();
            }
            catch (Exception ex)
            {
                StrLastError = ex.Message;
            }
            finally
            {
                SQLiteConnection.ClearAllPools();
            }
            return dt;
        }

        /// <summary>
        /// 取datatable
        /// </summary>
        /// <param name="strSql">SQL语句</param>
        /// <param name="paraList">命令参数集合</param>
        /// <returns>
        /// 返回DataTable
        /// </returns>
        public static DataTable GetDataTable(string strSql,params SQLiteParameter[] paraList)
        {
            DataTable dt = null;
            try
            {
                SQLiteConnection conn = new SQLiteConnection(ConnString);
                conn.Open();
                SQLiteCommand cmd = new SQLiteCommand
                {
                    CommandText = strSql
                };
                if (paraList != null && paraList.Length > 0)
                {
                    cmd.Parameters.AddRange(paraList);
                }
                cmd.Connection = conn;
                SQLiteDataAdapter dao = new SQLiteDataAdapter(cmd);
                dt = new DataTable();
                dao.Fill(dt);
                conn.Close();
            }
            catch (Exception ex)
            {
                StrLastError = ex.Message;
            }
            finally
            {
                SQLiteConnection.ClearAllPools();
            }
            return dt;
        }

        /// <summary>
        /// 取最大的ID
        /// </summary>
        /// <param name="sKeyField">字段</param>
        /// <param name="sTableName">表名</param>
        /// <returns></returns>
        public static int GetMaxId(string sKeyField,string sTableName)
        {
            DataTable dt = GetDataTable("select ifnull(max([" + sKeyField + "]),0) as MaxID from [" + sTableName + "]");
            if (dt != null && dt.Rows.Count > 0)
            {
                return Convert.ToInt32(dt.Rows[0][0].ToString());
            }
            return 0;
        }

        /// <summary>
        /// 取最大的ID
        /// </summary>
        /// <param name="sKeyField">字段</param>
        /// <param name="sTableName">表名</param>
        /// <param name="paraList">命令参数集合</param>
        /// <returns></returns>
        public static int GetMaxId(string sKeyField,string sTableName,params SQLiteParameter[] paraList)
        {
            DataTable dt = GetDataTable("select ifnull(max([" + sKeyField + "]),0) as MaxID from [" + sTableName + "]",paraList);
            if (dt != null && dt.Rows.Count > 0)
            {
                return Convert.ToInt32(dt.Rows[0][0].ToString());
            }
            return 0;
        }

        /// <summary>
        /// 查询数据库中的所有数据类型信息
        /// </summary>
        /// <returns></returns>
        public static DataTable GetSchema()
        {
            using (SQLiteConnection connection = new SQLiteConnection(ConnString))
            {
                connection.Open();
                DataTable data = connection.GetSchema("TABLES");
                connection.Close();
                SQLiteConnection.ClearAllPools();
                return data;
            }
        }

        /// <summary>
        /// 取某个单一的元素
        /// </summary>
        /// <param name="strSql">strSql语句</param>
        /// <param name="paraList">命令参数集合</param>
        /// <returns>
        /// 返回dataset的第一行第一列的元素
        /// </returns>
        public static object GetSingle(string strSql,params SQLiteParameter[] paraList)
        {
            DataTable dt = GetDataTable(strSql,paraList);
            if (dt != null && dt.Rows.Count > 0)
            {
                return dt.Rows[0][0];
            }
            return null;
        }

        /// <summary>
        /// 取某个单一的元素
        /// </summary>
        /// <param name="strSql">strSql语句</param>
        /// <returns>
        /// 返回dataset的第一行第一列的元素
        /// </returns>
        public static object GetSingle(string strSql)
        {
            DataTable dt = GetDataTable(strSql);
            if (dt != null && dt.Rows.Count > 0)
            {
                return dt.Rows[0][0];
            }
            return null;
        }

        /// <summary>
        /// 判断是否存在
        /// </summary>
        /// <param name="strSql">SQL</param>
        /// <param name="paraList">命令参数集合</param>
        /// <returns>
        ///   <c>true</c> if the specified string SQL is exist; otherwise,<c>false</c>.
        /// </returns>
        public static bool IsExist(string strSql,params SQLiteParameter[] paraList)
        {
            DataTable dt;
            try
            {
                SQLiteConnection conn = new SQLiteConnection(ConnString);
                conn.Open();
                SQLiteCommand cmd = new SQLiteCommand
                {
                    CommandText = strSql
                };
                if (paraList != null && paraList.Length > 0)
                {
                    cmd.Parameters.AddRange(paraList);
                }
                cmd.Connection = conn;
                SQLiteDataAdapter dao = new SQLiteDataAdapter(cmd);
                dt = new DataTable();
                dao.Fill(dt);
                conn.Close();
                SQLiteConnection.ClearAllPools();
            }
            catch (Exception ex)
            {
                StrLastError = ex.Message;
                return false;
            }
            if (dt.Rows.Count > 0)
            {
                if (Convert.ToInt32(dt.Rows[0][0]) > 0)
                {
                    return true;
                }
            }
            return false;
        }

        /// <summary>
        /// 执行insert,update,delete 动作，也可以使用事务
        /// </summary>
        /// <param name="strSql">strSql语句</param>
        /// <param name="bUseTransaction">是否使用事务，默认不使用事务</param>
        /// <returns></returns>
        public static bool UpdateData(string strSql,bool bUseTransaction)
        {
            int iResult;
            if (!bUseTransaction)
            {
                try
                {
                    SQLiteConnection conn = new SQLiteConnection(ConnString);
                    conn.Open();
                    SQLiteCommand comm = new SQLiteCommand(conn)
                    {
                        CommandText = strSql
                    };
                    iResult = comm.ExecuteNonQuery();
                    conn.Close();
                }
                catch (Exception ex)
                {
                    StrLastError = ex.Message;
                    iResult = -1;
                }
            }
            else // 使用事务 
            {
                SQLiteConnection conn = new SQLiteConnection(ConnString);
                conn.Open();
                DbTransaction trans = conn.BeginTransaction();
                try
                {
                    SQLiteCommand comm = new SQLiteCommand(conn)
                    {
                        CommandText = strSql
                    };
                    iResult = comm.ExecuteNonQuery();
                    trans.Commit();
                    conn.Close();
                }

                catch (Exception ex)
                {
                    iResult = -1;
                    trans.Rollback();
                    StrLastError = ex.Message;
                }
            }
            SQLiteConnection.ClearAllPools();
            return iResult > 0;
        }

        /// <summary>
        /// 执行insert,delete 动作，也可以使用事务
        /// </summary>
        /// <param name="strSql">strSql语句</param>
        /// <param name="bUseTransaction">是否使用事务，默认不使用事务</param>
        /// <param name="paraList">命令参数集合</param>
        /// <returns></returns>
        public static bool UpdateData(string strSql,bool bUseTransaction,params SQLiteParameter[] paraList)
        {
            int iResult;
            if (!bUseTransaction)
            {
                try
                {
                    SQLiteConnection conn = new SQLiteConnection(ConnString);
                    conn.Open();
                    SQLiteCommand cmd = new SQLiteCommand(conn)
                    {
                        CommandText = strSql
                    };
                    if (paraList != null && paraList.Length > 0)
                    {
                        cmd.Parameters.AddRange(paraList);
                    }
                    iResult = cmd.ExecuteNonQuery();
                    conn.Close();
                }
                catch (Exception ex)
                {
                    iResult = -1;
                    StrLastError = ex.Message;
                }
            }

            else // 使用事务 
            {
                SQLiteConnection conn = new SQLiteConnection(ConnString);
                conn.Open();
                DbTransaction trans = conn.BeginTransaction();
                try
                {
                    SQLiteCommand cmd = new SQLiteCommand(conn)
                    {
                        CommandText = strSql
                    };
                    if (paraList != null && paraList.Length > 0)
                    {
                        cmd.Parameters.AddRange(paraList);
                    }
                    iResult = cmd.ExecuteNonQuery();
                    trans.Commit();
                    conn.Close();
                }

                catch (Exception ex)
                {
                    iResult = -1;
                    trans.Rollback();
                    StrLastError = ex.Message;
                }
            }
            SQLiteConnection.ClearAllPools();
            return iResult > 0;
        }

        /// <summary>
        /// Prepares the command.
        /// </summary>
        /// <param name="cmd">The command.</param>
        /// <param name="conn">The connection.</param>
        /// <param name="trans">The trans.</param>
        /// <param name="cmdText">The command text.</param>
        /// <param name="cmdParms">The command parms.</param>
        private static void PrepareCommand(SQLiteCommand cmd,SQLiteConnection conn,SQLiteTransaction trans,string cmdText,SQLiteParameter[] cmdParms)
        {
            if (conn.State != ConnectionState.Open)
            {
                conn.Open();
            }
            cmd.Connection = conn;
            cmd.CommandText = cmdText;
            if (trans != null)
            {
                cmd.Transaction = trans;
            }
            cmd.CommandType = CommandType.Text;
            if (cmdParms != null)
            {
                foreach (SQLiteParameter parm in cmdParms)
                {
                    cmd.Parameters.Add(parm);
                }
            }
        }

        /// <summary>
        /// Existses the specified string SQL.
        /// </summary>
        /// <param name="strSql">The string SQL.</param>
        /// <returns></returns>
        public static bool Exists(string strSql)
        {
            object obj = GetSingle(strSql);
            int cmdresult;
            if (Equals(obj,null) || Equals(obj,DBNull.Value))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = int.Parse(obj.ToString());
            }
            if (cmdresult == 0)
            {
                return false;
            }
            return true;
        }

        /// <summary>
        /// Existses the specified string SQL.
        /// </summary>
        /// <param name="strSql">The string SQL.</param>
        /// <param name="cmdParms">The command parms.</param>
        /// <returns></returns>
        public static bool Exists(string strSql,params SQLiteParameter[] cmdParms)
        {
            object obj = GetSingle(strSql,cmdParms);
            int cmdresult;
            if (Equals(obj,DBNull.Value))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = int.Parse(obj.ToString());
            }
            if (cmdresult == 0)
            {
                return false;
            }
            return true;
        }
    }

（编辑：李大同）

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