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

view plain

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

3、执行存储过程

view plain

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

4、返回DataSet

view plain

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

5、返回DataTable

view plain

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

view plain

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;
int r = Convert.ToInt32(db.GetParameter(cmd, "@returnValue").Value);

7、DataReader使用

view plain

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;
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:

view plain

pubic void DoBusiness()
{
using (Trans t = new Trans())
{
try
{
D1(t);
throw new Exception();
D2(t);
t.Commit();
}
catch
{
t.RollBack();
}
}
}
public void D1(Trans t)
{
DbHelper db = new DbHelper();
DbCommand cmd = db.GetStoredProcCommond("table_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;
int r = Convert.ToInt32(db.GetParameter(cmd, "@returnValue").Value);
}
public void D2(Trans t)
{
DbHelper db = new DbHelper();
DbCommand cmd = db.GetSqlStringCommond("insert table (id)values(@id)");
if (t == null) db.ExecuteNonQuery(cmd);
else db.ExecuteNonQuery(cmd, t);
}

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