求个增删改查的通用基类。

[kiaoqq2010]

今天不要脸皮，跪求基类。
只为学习用。

[winner2050]

用微软的sqlhelper

[Peter200694013]

数据库操作类？

sqlhelper..

[「已注销」]

微软的

public abstract class SQLHelper
    {
        /// <summary>
        /// 连接字符串
        /// </summary>

       public static readonly string ConnectionString = "数据库连接字符串";

       
       
            
        private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());

        /// <summary>
        /// 数据库增,删,改方法
        /// </summary>
        /// <param name="connectionString">连接字符串</param>
        /// <param name="cmdType">Command类型</param>
        /// <param name="cmdText">执行文本</param>
        /// <param name="commandParameters">参数</param>
        /// <returns></returns>
        public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {

            SqlCommand cmd = new SqlCommand();
            
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                int val = cmd.ExecuteNonQuery();
                cmd.Parameters.Clear();
                return val;
            }
        }

        /// <summary>a
        /// 数据库增,删,改方法

        /// </summary>
        /// <param name="connection">连接对象</param>
        /// <param name="cmdType">Command类型</param>
        /// <param name="cmdText">执行文本</param>
        /// <param name="commandParameters">参数</param>
        /// <returns></returns>
        public static int ExecuteNonQuery(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {

            SqlCommand cmd = new SqlCommand();

            PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
            int val = cmd.ExecuteNonQuery();
            cmd.Parameters.Clear();
            return val;
        }

        /// <summary>
        /// 数据库增,删,改方法

        /// </summary>
        /// <param name="trans">事务</param>
        /// <param name="cmdType">Command类型</param>
        /// <param name="cmdText">执行文本</param>
        /// <param name="commandParameters">参数</param>
        /// <returns></returns>
        public static int ExecuteNonQuery(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();
            PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters);
            int val = cmd.ExecuteNonQuery();
            cmd.Parameters.Clear();
            return val;
        }

        /// <summary>
        /// 读取数据
        /// </summary>
        /// <param name="connectionString">连接字符串</param>
        /// <param name="cmdType">Command类型</param>
        /// <param name="cmdText">执行文本</param>
        /// <param name="commandParameters">参数</param>
        /// <returns>SqlDataReader</returns>
        public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();
            SqlConnection conn = new SqlConnection(connectionString);


            try
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return rdr;
            }
            catch(SqlException ex)
            {
                string s = ex.Message;
                conn.Close();
                throw;
            }
        }

        /// <summary>
        /// 读取数据
        /// </summary>
        /// <param name="safeSql">执行文本</param>
        /// <param name="cmdType">command类型</param>
        /// <param name="connectionString">连接字符串</param>
        /// <returns>DataTable</returns>
        public static DataTable GetDataSet(string safeSql,CommandType cmdType, string connectionString)
        {
            DataSet ds = new DataSet();
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                SqlCommand cmd = new SqlCommand(safeSql, conn);
                SqlDataAdapter da = new SqlDataAdapter(cmd);
                da.Fill(ds);
                return ds.Tables[0];
            }

        }

        /// <summary>
        /// 读取数据
        /// </summary>
        /// <param name="connectionString">连接字符串</param>
        /// <param name="cmdType">command类型</param>
        /// <param name="sql">执行文本</param>
        /// <param name="values">参数</param>
        /// <returns>DataTable</returns>
        public static DataTable GetDataSet(string connectionString,CommandType cmdType, string sql, params SqlParameter[] values)
        {
            DataSet ds = new DataSet();
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                SqlCommand cmd = new SqlCommand(sql, conn);
                cmd.CommandType = cmdType;
                cmd.Parameters.AddRange(values);
                SqlDataAdapter da = new SqlDataAdapter(cmd);
                da.Fill(ds);
                return ds.Tables[0];
            }

        }

        /// <summary>
        /// 得到单个返回值结果

        /// </summary>
        /// <param name="connectionString">连接字符串</param>
        /// <param name="cmdType">command类型</param>
        /// <param name="cmdText">执行文本</param>
        /// <param name="commandParameters">参数</param>
        /// <returns>object对象</returns>
        public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();

            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
                object val = cmd.ExecuteScalar();
                cmd.Parameters.Clear();
                return val;
            }
        }

        /// <summary>
        /// 得到单个返回值结果

        /// </summary>
        /// <param name="connection">连接对象</param>
        /// <param name="cmdType">command类型</param>
        /// <param name="cmdText">执行文本</param>
        /// <param name="commandParameters">参数</param>
        /// <returns>object对象</returns>
        public static object ExecuteScalar(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {

            SqlCommand cmd = new SqlCommand();

            PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
            object val = cmd.ExecuteScalar();
            cmd.Parameters.Clear();
            return val;
        }

        public static void CacheParameters(string cacheKey, params SqlParameter[] commandParameters)
        {
            parmCache[cacheKey] = commandParameters;
        }

        public static SqlParameter[] GetCachedParameters(string cacheKey)
        {
            SqlParameter[] cachedParms = (SqlParameter[])parmCache[cacheKey];

            if (cachedParms == null)
                return null;

            SqlParameter[] clonedParms = new SqlParameter[cachedParms.Length];

            for (int i = 0, j = cachedParms.Length; i < j; i++)
                clonedParms[i] = (SqlParameter)((ICloneable)cachedParms[i]).Clone();

            return clonedParms;
        }

        /// <summary>
        /// 处理ADO.NET数据操作对象
        /// </summary>
        /// <param name="cmd">执行对象</param>
        /// <param name="conn">连接对象</param>
        /// <param name="trans">事务对象</param>
        /// <param name="cmdType">command类型</param>
        /// <param name="cmdText">执行文本</param>
        /// <param name="cmdParms">参数</param>
        private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms)
        {

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

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

            if (trans != null)
                cmd.Transaction = trans;

            cmd.CommandType = cmdType;

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

[zhulong1111]

mark 官方的 比较好用

[myhope88]

下载个helper类就行啦

[Peter200694013]

DBAccess.cs

using System;
using System.Data;
using System.Data.SqlClient;
using System.Collections.Generic;
using System.Linq;
using System.Text;


namespace DBAccess
{
    public class SqlHelper:DBAccess
    {
        private List<SqlParameter> m_ListParameter = null;

        public DataTable ExecuteDataTable(string cmdText, params SqlParameter[] commandParameters)
        {
            DataSet ds = ExecuteDataSet(cmdText, commandParameters);
            if (null != ds)
            {
                if (0 != ds.Tables.Count)
                {
                    return ds.Tables[0];
                }
                else
                {
                    return null;
                }
            }
            else
            {
                return null;
            }
        }

        public DataTable ExecuteDataTable(string cmdText)
        {
            return ExecuteDataTable(cmdText, GetParameters());
        }

        public DataRow ExecuteDataRow(string cmdText, params SqlParameter[] commandParameters)
        {
            DataTable dt = ExecuteDataTable(cmdText, commandParameters);
            if (null != dt)
            {
                if (0 != dt.Rows.Count)
                {
                    return dt.Rows[0];

                }
                else
                {
                    return null;
                }
            }
            else
            {
                return null;
            }
        }

        public DataRow ExecuteDataRow(string cmdText)
        {
            return ExecuteDataRow(cmdText, GetParameters());
        }

        public int ExecuteNonQuery(string cmdText)
        {
            return ExecuteNonQuery(cmdText, GetParameters());
        }
        public int ExecuteNonQuery(SqlTransaction trans, string cmdText)
        {
            return ExecuteNonQuery(trans, cmdText, GetParameters());
        }
        public DataSet ExecuteDataSet(string cmdText)
        {
            return ExecuteDataSet(cmdText, GetParameters());
        }
        public SqlDataReader ExecuteReader(string cmdText)
        {
            return ExecuteReader(cmdText, GetParameters());
        }
        public object ExecuteScalar(string cmdText)
        {
            return ExecuteScalar(cmdText, GetParameters());
        }

        private SqlParameter GetParameter(string paraName, SqlDbType paraType, object value)
        {
            SqlParameter para = new SqlParameter(paraName, paraType);
            para.Value = value;

            return para;
        }

        private SqlParameter GetParameter(string paraName, SqlDbType paraType, object value, int size)
        {
            SqlParameter para = new SqlParameter(paraName, paraType);
            para.Value = value;
            para.Size = size;
            return para;
        }

        public void AddParameter(string paraName, SqlDbType paraType, object value)
        {
            if (null == m_ListParameter)
            {
                m_ListParameter = new List<SqlParameter>();
            }
            SqlParameter para = GetParameter(paraName, paraType, value);
            m_ListParameter.Add(para);
        }

        private SqlParameter[] GetParameters()
        {
            SqlParameter[] paras = null;
            if (null != m_ListParameter)
            {
                if (0 != m_ListParameter.Count)
                {
                    paras = m_ListParameter.ToArray();
                }
                m_ListParameter = null;
            }

            return paras;
        }
    }
}

SqlHelper.cs

using System;
using System.Data;
using System.Data.SqlClient;
using System.Collections.Generic;
using System.Linq;
using System.Text;


namespace DBAccess
{
    public class SqlHelper:DBAccess
    {
        private List<SqlParameter> m_ListParameter = null;

        public DataTable ExecuteDataTable(string cmdText, params SqlParameter[] commandParameters)
        {
            DataSet ds = ExecuteDataSet(cmdText, commandParameters);
            if (null != ds)
            {
                if (0 != ds.Tables.Count)
                {
                    return ds.Tables[0];
                }
                else
                {
                    return null;
                }
            }
            else
            {
                return null;
            }
        }

        public DataTable ExecuteDataTable(string cmdText)
        {
            return ExecuteDataTable(cmdText, GetParameters());
        }

        public DataRow ExecuteDataRow(string cmdText, params SqlParameter[] commandParameters)
        {
            DataTable dt = ExecuteDataTable(cmdText, commandParameters);
            if (null != dt)
            {
                if (0 != dt.Rows.Count)
                {
                    return dt.Rows[0];

                }
                else
                {
                    return null;
                }
            }
            else
            {
                return null;
            }
        }

        public DataRow ExecuteDataRow(string cmdText)
        {
            return ExecuteDataRow(cmdText, GetParameters());
        }

        public int ExecuteNonQuery(string cmdText)
        {
            return ExecuteNonQuery(cmdText, GetParameters());
        }
        public int ExecuteNonQuery(SqlTransaction trans, string cmdText)
        {
            return ExecuteNonQuery(trans, cmdText, GetParameters());
        }
        public DataSet ExecuteDataSet(string cmdText)
        {
            return ExecuteDataSet(cmdText, GetParameters());
        }
        public SqlDataReader ExecuteReader(string cmdText)
        {
            return ExecuteReader(cmdText, GetParameters());
        }
        public object ExecuteScalar(string cmdText)
        {
            return ExecuteScalar(cmdText, GetParameters());
        }

        private SqlParameter GetParameter(string paraName, SqlDbType paraType, object value)
        {
            SqlParameter para = new SqlParameter(paraName, paraType);
            para.Value = value;

            return para;
        }

        private SqlParameter GetParameter(string paraName, SqlDbType paraType, object value, int size)
        {
            SqlParameter para = new SqlParameter(paraName, paraType);
            para.Value = value;
            para.Size = size;
            return para;
        }

        public void AddParameter(string paraName, SqlDbType paraType, object value)
        {
            if (null == m_ListParameter)
            {
                m_ListParameter = new List<SqlParameter>();
            }
            SqlParameter para = GetParameter(paraName, paraType, value);
            m_ListParameter.Add(para);
        }

        private SqlParameter[] GetParameters()
        {
            SqlParameter[] paras = null;
            if (null != m_ListParameter)
            {
                if (0 != m_ListParameter.Count)
                {
                    paras = m_ListParameter.ToArray();
                }
                m_ListParameter = null;
            }

            return paras;
        }
    }
}

[kiaoqq2010]

sqlhelper...

可能各位误解我的意思了。

DataSet get()
{

}
int del(int id)
{

}

这样写大概就清楚意思了。- -!!

因为有很多不同的模块都经常用到这些形式的方法。我就想，写一个通用的父类，碰到相同的操作就可以直接调用父类的方法。

[一克代码]

[Quote=引用 3 楼 zhengfujie 的回复:]
微软的

C# code

public abstract class SQLHelper
{
/// <summary>
/// 连接字符串
/// </summary>

public static readonly string ConnectionString = "数据库连接字符串";

……
[/Quote]

很随意！！！！！！！

[凤凰涅檠]

mark up

[kiaoqq2010]

- -!!

怎么就到7楼了。

[IHandler]

按楼主的意思，让SqlHelper继承System.Web.UI.Page
然后Web窗体类继承SqlHelper

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

/// <summary>
///BasePge 的摘要说明
/// </summary>
public class BasePage:System.Web.UI.Page
{
	public BasePage()
	{
		//
		//TODO: 在此处添加构造函数逻辑
		//
	}
    //
    //执行数据库操作的方法
    //
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;

public partial class _Default : BasePage 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {

            
        }
    }

}

[IHandler]

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;

/// <summary>
///BasePge 的摘要说明
/// </summary>
public class BasePage:System.Web.UI.Page
{
	public BasePage()
	{
		//
		//TODO: 在此处添加构造函数逻辑
		//
	}
    //
    //执行数据库操作的方法
    //
    protected virtual DataSet GetDataSet(String query)
    {
        //......
        return new DataSet();
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;

public partial class _Default : BasePage 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            //调用基类的方法
            DataSet ds = GetDataSet("Select * from Users");
        }
    }

}

[脾气不坏]

mark！
学习。。。

[kiaoqq2010]

汗 所以问问题要详细。汗 分浪费了。

[cjfriends]

[Quote=引用 1 楼 winner2050 的回复:]
用微软的sqlhelper
[/Quote]
这个很全很强大的

[sundada2013]

我也来求求求啊