C# SQLite database access encapsulation class-C#.Net Tutorial-php.cn

Under the client configuration file node, add:

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where [localdb] is the local SQLite database The name, [config/local.db] is the SQLite database location in the current program running directory

C# SQLite database access encapsulation class code:

 /// 
    /// 本类为SQLite数据库帮助静态类,使用时只需直接调用即可,无需实例化
    /// 
    public static class SQLiteHelper
    {
        // Application.StartupPath
        public static string LocalDbConnectionString = ConfigurationManager.ConnectionStrings["localdb"].ConnectionString;

        #region ExecuteNonQuery
        /// 
        /// 执行数据库操作(新增、更新或删除)
        /// 
        /// 连接字符串
        /// SqlCommand对象
        /// 所受影响的行数
        public static int ExecuteNonQuery(string connectionString, SQLiteCommand cmd)
        {
            int result = 0;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            using (SQLiteConnection con = new SQLiteConnection(connectionString))
            {
                SQLiteTransaction trans = null;
                PrepareCommand(cmd, con, ref trans, true, cmd.CommandType, cmd.CommandText);
                try
                {
                    result = cmd.ExecuteNonQuery();
                    trans.Commit();
                }
                catch (Exception ex)
                {
                    trans.Rollback();
                    throw ex;
                }
            }
            return result;
        }

        /// 
        /// 执行数据库操作(新增、更新或删除)
        /// 
        /// 连接字符串
        /// 执行语句或存储过程名
        /// 执行类型
        /// 所受影响的行数
        public static int ExecuteNonQuery(string connectionString, string commandText, CommandType commandType)
        {
            int result = 0;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0)
                throw new ArgumentNullException("commandText");
            SQLiteCommand cmd = new SQLiteCommand();
            using (SQLiteConnection con = new SQLiteConnection(connectionString))
            {
                SQLiteTransaction trans = null;
                PrepareCommand(cmd, con, ref trans, true, commandType, commandText);
                try
                {
                    result = cmd.ExecuteNonQuery();
                    trans.Commit();
                }
                catch (Exception ex)
                {
                    trans.Rollback();
                    throw ex;
                }
            }
            return result;
        }

        /// 
        /// 执行数据库操作(新增、更新或删除)
        /// 
        /// 连接字符串
        /// 执行语句或存储过程名
        /// 执行类型
        /// SQL参数对象
        /// 所受影响的行数
        public static int ExecuteNonQuery(string connectionString, string commandText, CommandType commandType, params SQLiteParameter[] cmdParms)
        {
            int result = 0;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0)
                throw new ArgumentNullException("commandText");

            SQLiteCommand cmd = new SQLiteCommand();
            using (SQLiteConnection con = new SQLiteConnection(connectionString))
            {
                SQLiteTransaction trans = null;
                PrepareCommand(cmd, con, ref trans, true, commandType, commandText);
                try
                {
                    result = cmd.ExecuteNonQuery();
                    trans.Commit();
                }
                catch (Exception ex)
                {
                    trans.Rollback();
                    throw ex;
                }
            }
            return result;
        }
        #endregion

        #region ExecuteScalar
        /// 
        /// 执行数据库操作(新增、更新或删除)同时返回执行后查询所得的第1行第1列数据
        /// 
        /// 连接字符串
        /// SqlCommand对象
        /// 查询所得的第1行第1列数据
        public static object ExecuteScalar(string connectionString, SQLiteCommand cmd)
        {
            object result = 0;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            using (SQLiteConnection con = new SQLiteConnection(connectionString))
            {
                SQLiteTransaction trans = null;
                PrepareCommand(cmd, con, ref trans, true, cmd.CommandType, cmd.CommandText);
                try
                {
                    result = cmd.ExecuteScalar();
                    trans.Commit();
                }
                catch (Exception ex)
                {
                    trans.Rollback();
                    throw ex;
                }
            }
            return result;
        }

        /// 
        /// 执行数据库操作(新增、更新或删除)同时返回执行后查询所得的第1行第1列数据
        /// 
        /// 连接字符串
        /// 执行语句或存储过程名
        /// 执行类型
        /// 查询所得的第1行第1列数据
        public static object ExecuteScalar(string connectionString, string commandText, CommandType commandType)
        {
            object result = 0;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0)
                throw new ArgumentNullException("commandText");
            SQLiteCommand cmd = new SQLiteCommand();
            using (SQLiteConnection con = new SQLiteConnection(connectionString))
            {
                SQLiteTransaction trans = null;
                PrepareCommand(cmd, con, ref trans, true, commandType, commandText);
                try
                {
                    result = cmd.ExecuteScalar();
                    trans.Commit();
                }
                catch (Exception ex)
                {
                    trans.Rollback();
                    throw ex;
                }
            }
            return result;
        }

        /// 
        /// 执行数据库操作(新增、更新或删除)同时返回执行后查询所得的第1行第1列数据
        /// 
        /// 连接字符串
        /// 执行语句或存储过程名
        /// 执行类型
        /// SQL参数对象
        /// 查询所得的第1行第1列数据
        public static object ExecuteScalar(string connectionString, string commandText, CommandType commandType, params SQLiteParameter[] cmdParms)
        {
            object result = 0;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0)
                throw new ArgumentNullException("commandText");

            SQLiteCommand cmd = new SQLiteCommand();
            using (SQLiteConnection con = new SQLiteConnection(connectionString))
            {
                SQLiteTransaction trans = null;
                PrepareCommand(cmd, con, ref trans, true, commandType, commandText);
                try
                {
                    result = cmd.ExecuteScalar();
                    trans.Commit();
                }
                catch (Exception ex)
                {
                    trans.Rollback();
                    throw ex;
                }
            }
            return result;
        }
        #endregion

        #region ExecuteReader
        /// 
        /// 执行数据库查询，返回SqlDataReader对象
        /// 
        /// 连接字符串
        /// SqlCommand对象
        /// SqlDataReader对象
        public static DbDataReader ExecuteReader(string connectionString, SQLiteCommand cmd)
        {
            DbDataReader reader = null;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");

            SQLiteConnection con = new SQLiteConnection(connectionString);
            SQLiteTransaction trans = null;
            PrepareCommand(cmd, con, ref trans, false, cmd.CommandType, cmd.CommandText);
            try
            {
                reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            return reader;
        }

        /// 
        /// 执行数据库查询，返回SqlDataReader对象
        /// 
        /// 连接字符串
        /// 执行语句或存储过程名
        /// 执行类型
        /// SqlDataReader对象
        public static DbDataReader ExecuteReader(string connectionString, string commandText, CommandType commandType)
        {
            DbDataReader reader = null;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0)
                throw new ArgumentNullException("commandText");

            SQLiteConnection con = new SQLiteConnection(connectionString);
            SQLiteCommand cmd = new SQLiteCommand();
            SQLiteTransaction trans = null;
            PrepareCommand(cmd, con, ref trans, false, commandType, commandText);
            try
            {
                reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            return reader;
        }

        /// 
        /// 执行数据库查询，返回SqlDataReader对象
        /// 
        /// 连接字符串
        /// 执行语句或存储过程名
        /// 执行类型
        /// SQL参数对象
        /// SqlDataReader对象
        public static DbDataReader ExecuteReader(string connectionString, string commandText, CommandType commandType, params SQLiteParameter[] cmdParms)
        {
            DbDataReader reader = null;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0)
                throw new ArgumentNullException("commandText");

            SQLiteConnection con = new SQLiteConnection(connectionString);
            SQLiteCommand cmd = new SQLiteCommand();
            SQLiteTransaction trans = null;
            PrepareCommand(cmd, con, ref trans, false, commandType, commandText, cmdParms);
            try
            {
                reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            return reader;
        }
        #endregion

        #region ExecuteDataSet
        /// 
        /// 执行数据库查询，返回DataSet对象
        /// 
        /// 连接字符串
        /// SqlCommand对象
        /// DataSet对象
        public static DataSet ExecuteDataSet(string connectionString, SQLiteCommand cmd)
        {
            DataSet ds = new DataSet();
            SQLiteConnection con = new SQLiteConnection(connectionString);
            SQLiteTransaction trans = null;
            PrepareCommand(cmd, con, ref trans, false, cmd.CommandType, cmd.CommandText);
            try
            {
                SQLiteDataAdapter sda = new SQLiteDataAdapter(cmd);
                sda.Fill(ds);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (cmd.Connection != null)
                {
                    if (cmd.Connection.State == ConnectionState.Open)
                    {
                        cmd.Connection.Close();
                    }
                }
            }
            return ds;
        }

        /// 
        /// 执行数据库查询，返回DataSet对象
        /// 
        /// 连接字符串
        /// 执行语句或存储过程名
        /// 执行类型
        /// DataSet对象
        public static DataSet ExecuteDataSet(string connectionString, string commandText, CommandType commandType)
        {
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0)
                throw new ArgumentNullException("commandText");
            DataSet ds = new DataSet();
            SQLiteConnection con = new SQLiteConnection(connectionString);
            SQLiteCommand cmd = new SQLiteCommand();
            SQLiteTransaction trans = null;
            PrepareCommand(cmd, con, ref trans, false, commandType, commandText);
            try
            {
                SQLiteDataAdapter sda = new SQLiteDataAdapter(cmd);
                sda.Fill(ds);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (con != null)
                {
                    if (con.State == ConnectionState.Open)
                    {
                        con.Close();
                    }
                }
            }
            return ds;
        }

        /// 
        /// 执行数据库查询，返回DataSet对象
        /// 
        /// 连接字符串
        /// 执行语句或存储过程名
        /// 执行类型
        /// SQL参数对象
        /// DataSet对象
        public static DataSet ExecuteDataSet(string connectionString, string commandText, CommandType commandType, params SQLiteParameter[] cmdParms)
        {
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0)
                throw new ArgumentNullException("commandText");
            DataSet ds = new DataSet();
            SQLiteConnection con = new SQLiteConnection(connectionString);
            SQLiteCommand cmd = new SQLiteCommand();
            SQLiteTransaction trans = null;
            PrepareCommand(cmd, con, ref trans, false, commandType, commandText, cmdParms);
            try
            {
                SQLiteDataAdapter sda = new SQLiteDataAdapter(cmd);
                sda.Fill(ds);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (con != null)
                {
                    if (con.State == ConnectionState.Open)
                    {
                        con.Close();
                    }
                }
            }
            return ds;
        }
        #endregion

        #region 通用分页查询方法
        /// 
        /// 通用分页查询方法
        /// 
        /// 连接字符串
        /// 表名
        /// 查询字段名
        /// where条件
        /// 排序条件
        /// 每页数据数量
        /// 当前页数
        /// 数据总量
        /// DataTable数据表
        public static DataTable SelectPaging(string connString, string tableName, string strColumns, string strWhere, string strOrder, int pageSize, int currentIndex, out int recordOut)
        {
            DataTable dt = new DataTable();
            recordOut = Convert.ToInt32(ExecuteScalar(connString, "select count(*) from " + tableName, CommandType.Text));
            string pagingTemplate = "select {0} from {1} where {2} order by {3} limit {4} offset {5} ";
            int offsetCount = (currentIndex - 1) * pageSize;
            string commandText = String.Format(pagingTemplate, strColumns, tableName, strWhere, strOrder, pageSize.ToString(), offsetCount.ToString());
            using (DbDataReader reader = ExecuteReader(connString, commandText, CommandType.Text))
            {
                if (reader != null)
                {
                    dt.Load(reader);
                }
            }
            return dt;
        }
        #endregion

        #region  预处理Command对象,数据库链接,事务,需要执行的对象,参数等的初始化
        /// 
        /// 预处理Command对象,数据库链接,事务,需要执行的对象,参数等的初始化
        /// 
        /// Command对象
        /// Connection对象
        /// Transcation对象
        /// 是否使用事务
        /// SQL字符串执行类型
        /// SQL Text
        /// SQLiteParameters to use in the command
        private static void PrepareCommand(SQLiteCommand cmd, SQLiteConnection conn, ref SQLiteTransaction trans, bool useTrans, CommandType cmdType, string cmdText, params SQLiteParameter[] cmdParms)
        {

            if (conn.State != ConnectionState.Open)
                conn.Open();

            cmd.Connection = conn;
            cmd.CommandText = cmdText;

            if (useTrans)
            {
                trans = conn.BeginTransaction(IsolationLevel.ReadCommitted);
                cmd.Transaction = trans;
            }


            cmd.CommandType = cmdType;

            if (cmdParms != null)
            {
                foreach (SQLiteParameter parm in cmdParms)
                    cmd.Parameters.Add(parm);
            }
        }

        #endregion
    }

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Use demo:

 /// 
        /// 获取数据库关键字信息
        /// 
        /// 分类
        /// 版本
        /// 
        private DataSet GetSystemDataBaseKeyWords(string category, string versions)
        {
            StringBuilder sql = new StringBuilder();
            sql.Append("SELECT Keywords , Versions , Type , Description , Category  , Id , Extends ");
            sql.Append(" FROM A_DataBaseKeyWords ");
            sql.AppendFormat(" WHERE 1={0} ", "1");
            if (!String.IsNullOrEmpty(category))
            {
                sql.AppendFormat(" AND Category='{0}'", category);
            }
            if (!String.IsNullOrEmpty(versions))
            {
                sql.AppendFormat(" AND Versions='{0}'", versions);
            }
            return SQLiteHelper.ExecuteDataSet(SQLiteHelper.LocalDbConnectionString, sql.ToString(), CommandType.Text);
        }

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