DbHelper數據操作類

using System;
using System.Data;
using System.Data.Common;
using System.Configuration;

public class DbHelper
{
    private static string dbProviderName = ConfigurationManager.AppSettings["DbHelperProvider"];
    private static string dbConnectionString = ConfigurationManager.AppSettings["DbHelperConnectionString"];

    private DbConnection connection;
    public DbHelper()
    {
        this.connection = CreateConnection(DbHelper.dbConnectionString);
    }
    public DbHelper(string connectionString)
    {
        this.connection = CreateConnection(connectionString);
    }
    public static DbConnection CreateConnection()
    {
        DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbHelper.dbProviderName);
        DbConnection dbconn = dbfactory.CreateConnection();
        dbconn.ConnectionString = DbHelper.dbConnectionString;
        return dbconn;
    }
    public static DbConnection CreateConnection(string connectionString)
    {
        DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbHelper.dbProviderName);
        DbConnection dbconn = dbfactory.CreateConnection();
        dbconn.ConnectionString = connectionString;
        return dbconn;
    }

    public DbCommand GetStoredProcCommond(string storedProcedure)
    {
        DbCommand dbCommand = connection.CreateCommand();
        dbCommand.CommandText = storedProcedure;
        dbCommand.CommandType = CommandType.StoredProcedure;
        return dbCommand;
    }
    public DbCommand GetSqlStringCommond(string sqlQuery)
    {
        DbCommand dbCommand = connection.CreateCommand();
        dbCommand.CommandText = sqlQuery;
        dbCommand.CommandType = CommandType.Text;
        return dbCommand;
    }
    #region 增加參數
    public void AddParameterCollection(DbCommand cmd, DbParameterCollection dbParameterCollection)
    {
        foreach (DbParameter dbParameter in dbParameterCollection)
        {
            cmd.Parameters.Add(dbParameter);
        }
    }
    public void AddOutParameter(DbCommand cmd, string parameterName, DbType dbType, int size)
    {
        DbParameter dbParameter = cmd.CreateParameter();
        dbParameter.DbType = dbType;
        dbParameter.ParameterName = parameterName;
        dbParameter.Size = size;
        dbParameter.Direction = ParameterDirection.Output;
        cmd.Parameters.Add(dbParameter);
    }
    public void AddInParameter(DbCommand cmd, string parameterName, DbType dbType, object value)
    {
        DbParameter dbParameter = cmd.CreateParameter();
        dbParameter.DbType = dbType;
        dbParameter.ParameterName = parameterName;
        dbParameter.Value = value;
        dbParameter.Direction = ParameterDirection.Input;
        cmd.Parameters.Add(dbParameter);
    }
    public void AddReturnParameter(DbCommand cmd, string parameterName, DbType dbType)
    {
        DbParameter dbParameter = cmd.CreateParameter();
        dbParameter.DbType = dbType;
        dbParameter.ParameterName = parameterName;
        dbParameter.Direction = ParameterDirection.ReturnValue;
        cmd.Parameters.Add(dbParameter);
    }
    public DbParameter GetParameter(DbCommand cmd, string parameterName)
    {
        return cmd.Parameters[parameterName];
    }

    #endregion
    #region 執行
    public DataSet ExecuteDataSet(DbCommand cmd)
    {
        DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbHelper.dbProviderName);
        DbDataAdapter dbDataAdapter = dbfactory.CreateDataAdapter();
        dbDataAdapter.SelectCommand = cmd;
        DataSet ds = new DataSet();
        dbDataAdapter.Fill(ds);
        return ds;
    }

    public DataTable ExecuteDataTable(DbCommand cmd)
    {
        DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbHelper.dbProviderName);
        DbDataAdapter dbDataAdapter = dbfactory.CreateDataAdapter();
        dbDataAdapter.SelectCommand = cmd;
        DataTable dataTable = new DataTable();
        dbDataAdapter.Fill(dataTable);
        return dataTable;
    }

    public DbDataReader ExecuteReader(DbCommand cmd)
    {
        cmd.Connection.Open();
        DbDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
        return reader;
    }
    public int ExecuteNonQuery(DbCommand cmd)
    {
        cmd.Connection.Open();
        int ret = cmd.ExecuteNonQuery();
        cmd.Connection.Close();
        return ret;
    }

    public object ExecuteScalar(DbCommand cmd)
    {
        cmd.Connection.Open();
        object ret = cmd.ExecuteScalar();
        cmd.Connection.Close();
        return ret;
    }
    #endregion
    #region 執行事務
    public DataSet ExecuteDataSet(DbCommand cmd, Trans t)
    {
        cmd.Connection = t.DbConnection;
        cmd.Transaction = t.DbTrans;
        DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbHelper.dbProviderName);
        DbDataAdapter dbDataAdapter = dbfactory.CreateDataAdapter();
        dbDataAdapter.SelectCommand = cmd;
        DataSet ds = new DataSet();
        dbDataAdapter.Fill(ds);
        return ds;
    }

    public DataTable ExecuteDataTable(DbCommand cmd, Trans t)
    {
        cmd.Connection = t.DbConnection;
        cmd.Transaction = t.DbTrans;
        DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbHelper.dbProviderName);
        DbDataAdapter dbDataAdapter = dbfactory.CreateDataAdapter();
        dbDataAdapter.SelectCommand = cmd;
        DataTable dataTable = new DataTable();
        dbDataAdapter.Fill(dataTable);
        return dataTable;
    }

    public DbDataReader ExecuteReader(DbCommand cmd, Trans t)
    {
        cmd.Connection.Close();
        cmd.Connection = t.DbConnection;
        cmd.Transaction = t.DbTrans;
        DbDataReader reader = cmd.ExecuteReader();
        DataTable dt = new DataTable();
        return reader;
    }
    public int ExecuteNonQuery(DbCommand cmd, Trans t)
    {
        cmd.Connection.Close();
        cmd.Connection = t.DbConnection;
        cmd.Transaction = t.DbTrans;
        int ret = cmd.ExecuteNonQuery();
        return ret;
    }

    public object ExecuteScalar(DbCommand cmd, Trans t)
    {
        cmd.Connection.Close();
        cmd.Connection = t.DbConnection;
        cmd.Transaction = t.DbTrans;
        object ret = cmd.ExecuteScalar();
        return ret;
    }
    #endregion
}

public class Trans : IDisposable
{
    private DbConnection conn;
    private DbTransaction dbTrans;
    public DbConnection DbConnection
    {
        get { return this.conn; }
    }
    public DbTransaction DbTrans
    {
        get { return this.dbTrans; }
    }

    public Trans()
    {
        conn = DbHelper.CreateConnection();
        conn.Open();
        dbTrans = conn.BeginTransaction();
    }
    public Trans(string connectionString)
    {
        conn = DbHelper.CreateConnection(connectionString);
        conn.Open();
        dbTrans = conn.BeginTransaction();
    }
    public void Commit()
    {
        dbTrans.Commit();
        this.Colse();
    }

    public void RollBack()
    {
        dbTrans.Rollback();
        this.Colse();
    }

    public void Dispose()
    {
        this.Colse();
    }

    public void Colse()
    {
        if (conn.State == System.Data.ConnectionState.Open)
        {
            conn.Close();
        }
    }
}

那麼如何使用它呢?下面我給出一些基本的使用示例,基本能滿足你大部分的數據庫操作需要了.

1)直接執行sql語句

複製

保存

DbHelper db = new DbHelper();
DbCommand cmd = db.GetSqlStringCommond("insert t1 (id)values('haha')");
db.ExecuteNonQuery(cmd);

2)執行存儲過程

複製

保存

DbHelper db = new DbHelper();
DbCommand cmd = db.GetStoredProcCommond("t1_insert");
db.AddInParameter(cmd, "@id", DbType.String, "heihei");
db.ExecuteNonQuery(cmd);

3)返回DataSet

複製

保存

DbHelper db = new DbHelper();
DbCommand cmd = db.GetSqlStringCommond("select * from t1");
DataSet ds = db.ExecuteDataSet(cmd);

4)返回DataTable

複製

保存

DbHelper db = new DbHelper();
DbCommand cmd = db.GetSqlStringCommond("t1_findall");
DataTable dt = db.ExecuteDataTable(cmd);

5)輸入參數/輸出參數/返回值的使用(比較重要哦)

複製

保存

DbHelper db = new DbHelper();
DbCommand cmd = db.GetStoredProcCommond("t2_insert");
db.AddInParameter(cmd, "@timeticks", DbType.Int64, DateTime.Now.Ticks);
db.AddOutParameter(cmd, "@outString", DbType.String, 20);
db.AddReturnParameter(cmd, "@returnValue", DbType.Int32);

db.ExecuteNonQuery(cmd);

string s = db.GetParameter(cmd, "@outString").Value as string;//out parameter
int r = Convert.ToInt32(db.GetParameter(cmd, "@returnValue").Value);//return value

6)DataReader使用

複製

保存

DbHelper db = new DbHelper();
DbCommand cmd = db.GetStoredProcCommond("t2_insert");
db.AddInParameter(cmd, "@timeticks", DbType.Int64, DateTime.Now.Ticks);
db.AddOutParameter(cmd, "@outString", DbType.String, 20);
db.AddReturnParameter(cmd, "@returnValue", DbType.Int32);

using (DbDataReader reader = db.ExecuteReader(cmd))
{
    dt.Load(reader);
}
string s = db.GetParameter(cmd, "@outString").Value as string;//out parameter
int r = Convert.ToInt32(db.GetParameter(cmd, "@returnValue").Value);//return value

7)事務的使用.(項目中需要將基本的數據庫操作組合成一個完整的業務流時,代碼級的事務是必不可少的哦)

複製

保存

public void DoBusiness()
{
    using (Trans t = new Trans())
    {
        try
        {
            D1(t);
            throw new Exception();//如果有異常,會回滾滴
            D2(t);
            t.Commit();
        }
        catch
        {
            t.RollBack();
        }
    }
}
public void D1(Trans t)
{
    DbHelper db = new DbHelper();
    DbCommand cmd = db.GetStoredProcCommond("t2_insert");
    db.AddInParameter(cmd, "@timeticks", DbType.Int64, DateTime.Now.Ticks);
    db.AddOutParameter(cmd, "@outString", DbType.String, 20);
    db.AddReturnParameter(cmd, "@returnValue", DbType.Int32);

    if (t == null)
        db.ExecuteNonQuery(cmd);
    else
        db.ExecuteNonQuery(cmd, t);

    string s = db.GetParameter(cmd, "@outString").Value as string;//out parameter
    int r = Convert.ToInt32(db.GetParameter(cmd, "@returnValue").Value);//return value
}
public void D2(Trans t)
{
    DbHelper db = new DbHelper();
    DbCommand cmd = db.GetSqlStringCommond("insert t1 (id)values('..')");
    if (t == null)
        db.ExecuteNonQuery(cmd);
    else
        db.ExecuteNonQuery(cmd, t);
}

以上我們好像沒有指定數據庫連接字符串,大家如果看下DbHelper的代碼,就知道要使用它必須在config中配置兩個參數,如下:

複製

保存

<appSettings>
    <add key="DbHelperProvider" value="System.Data.SqlClient"/>
    <add key="DbHelperConnectionString" value="Data Source=(local);Initial Catalog=DbHelperTest;Persist Security Info=True;User ID=sa;Password=sa"/>
</appSettings>

其實,DbHelper需要的僅僅是兩個字符串,你可以自己修改,作成加密什麼的...

好了,就這樣,DbHelper的代碼是非常簡單和透明的,只是在ado.net上做了一點小包裝,改變了一下使用它的程序員的編碼方式,去除掉一些比較"物理級"的編程概念,如connection的open和close之類的,使程序員更專注於業務邏輯代碼的編寫,少死掉點腦細胞,另外,統一了數據操作層的數據操作代碼的風格和格式,維護起來很方便的撒~~~

DbHelper數據操作類

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