微软DbHelper

using System;
using System.Configuration;
using System.Data;
using System.Data.Common;
using System.Data.OleDb;
using System.Data.SqlClient;

namespace JADAY.Frame.DbHelper
{
    /// <summary>
    /// 数据库助手类
    /// </summary>
    public class DbUtility
    {
        private static string dbProviderName = ConfigurationSettings.AppSettings["DbProviderName"];
        private static string dbConnectionString = ConfigurationManager.AppSettings["TaxInvoiceConn"];

        private DbConnection connection;

        public DbUtility()
        {
            this.connection = CreateConnection(DbUtility.dbConnectionString);
        }

        public DbUtility(string connectionString)
        {
            this.connection = CreateConnection(connectionString);
        }

        public static DbConnection CreateConnection()
        {
            DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbUtility.dbProviderName);
            DbConnection dbconn = dbfactory.CreateConnection();
            dbconn.ConnectionString = DbUtility.dbConnectionString;
            return dbconn;
        }

        public static DbConnection CreateConnection(string connectionString)
        {
            DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbUtility.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 增加参数

        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 执行

        public DataSet ExecuteDataSet(DbCommand cmd)
        {
            DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbUtility.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(DbUtility.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 执行事务

        public DataSet ExecuteDataSet(DbCommand cmd, Trans t)
        {
            cmd.Connection = t.DbConnection;
            cmd.Transaction = t.DbTrans;
            DbProviderFactory dbfactory = DbProviderFactories.GetFactory(DbUtility.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(DbUtility.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 = DbUtility.CreateConnection();
            conn.Open();
            dbTrans = conn.BeginTransaction();
        }

        public Trans(string connectionString)
        {
            conn = DbUtility.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();
            }
        }
    }
}

2、直接执行sql语句

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1. DbHelper db = new DbHelper();
2. DbCommand cmd = db.GetSqlStringCommond("insert t1 (id)values(‘?haha‘?)");
3. db.ExecuteNonQuery(cmd);

3、执行存储过程

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

4、返回DataSet

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

5、返回DataTable

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

6、输入参数/输出参数/返回值的使用(比较重要哦)

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1. DbHelper db = new DbHelper();
2. DbCommand cmd = db.GetStoredProcCommond("t2_insert");
3. db.AddInParameter(cmd, "@timeticks", DbType.Int64, DateTime.Now.Ticks);
4. db.AddOutParameter(cmd, "@outString", DbType.String, 20);
5. db.AddReturnParameter(cmd, "@returnValue", DbType.Int32);
6. db.ExecuteNonQuery(cmd);
7. string s = db.GetParameter(cmd, "@outString").Value as string;
8. int r = Convert.ToInt32(db.GetParameter(cmd, "@returnValue").Value);

7、DataReader使用

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1. DbHelper db = new DbHelper();
2. DbCommand cmd = db.GetStoredProcCommond("t2_insert");
3. db.AddInParameter(cmd, "@timeticks", DbType.Int64, DateTime.Now.Ticks);
4. db.AddOutParameter(cmd, "@outString", DbType.String, 20);
5. db.AddReturnParameter(cmd, "@returnValue", DbType.Int32);
6. using (DbDataReader reader = db.ExecuteReader(cmd))
7. {
8. dt.Load(reader);
9. }
10. string s = db.GetParameter(cmd, "@outString").Value as string;
11. int r = Convert.ToInt32(db.GetParameter(cmd, "@returnValue").Value);

8、事务的使用.(项目中需要将基本的数据库操作组合成一个完整的业务流时,代码级的事务是必不可少的哦)

以上我们好像没有指定数据库连接字符串,大家如果看下DbHelper的代码,就知道要使用它必须在config中配置两个参数,如下:

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1. pubic void DoBusiness()
2. {
3. using (Trans t = new Trans())
4. {
5. try
6. {
7. D1(t);
8. throw new Exception();
9. D2(t);
10. t.Commit();
11. }
12. catch
13. {
14. t.RollBack();
15. }
16. }
17. }
18. public void D1(Trans t)
19. {
20. DbHelper db = new DbHelper();
21. DbCommand cmd = db.GetStoredProcCommond("table_insert");
22. db.AddInParameter(cmd, "@timeticks", DbType.Int64, DateTime.Now.Ticks);
23. db.AddOutParameter(cmd, "@outString", DbType.String, 20);
24. db.AddReturnParameter(cmd, "@returnValue", DbType.Int32);
25. if (t == null) db.ExecuteNonQuery(cmd);
26. else db.ExecuteNonQuery(cmd,t);
27. string s = db.GetParameter(cmd, "@outString").Value as string;
28. int r = Convert.ToInt32(db.GetParameter(cmd, "@returnValue").Value);
29. }
30. public void D2(Trans t)
31. {
32. DbHelper db = new DbHelper();
33. DbCommand cmd = db.GetSqlStringCommond("insert table (id)values(@id)");
34. if (t == null) db.ExecuteNonQuery(cmd);
35. else db.ExecuteNonQuery(cmd, t);
36. }