mysql 数据库dbhelp_C# VS连接数据库DBhelp
#region 執行查詢全部SQL語句,返回DataTable;查詢全部
DataTable dt=OracleHelper.ExecuteDataTable(sqlString);for (int i = 0; i < dt.Rows.Count; i++)
{
DataRow mydr=dt.Rows[i];string email = mydr["email"].ToString();
}public static DataTable ExecuteDataTable(string sql, paramsOracleParameter[] parameters)
{
OracleConnection connection= newOracleConnection(connStr);
OracleCommand cmd= newOracleCommand(sql, connection);try{if (connection.State !=ConnectionState.Open)
{
connection.Open();
}
cmd.CommandText=sql;
cmd.Parameters.AddRange(parameters);
OracleDataAdapter adapter= newOracleDataAdapter(cmd);
DataTable datatable= newDataTable();
adapter.Fill(datatable);returndatatable;
}catch(System.Exception ex)
{
connection.Close();//Console.WriteLine(ex.ToString());
return null;
}finally{
connection.Close();
}
}#endregion#region執行插入或修改SQL語句,返回True& false;if(OracleHelper.UpdateOpera(updateStr))
{
MessageBox.Show("成功")
}public static bool UpdateOpera(string sql, paramsOracleParameter[] parameters)
{
OracleConnection connection= newOracleConnection(connStr);
OracleCommand cmd= newOracleCommand(sql, connection);try{if (connection.State !=ConnectionState.Open)
{
connection.Open();
}
cmd.CommandText=sql;return cmd.ExecuteNonQuery() > 0;
}catch(System.Exception ex)
{
connection.Close();//Console.WriteLine(ex.ToString());
return false;
}finally{
connection.Close();
}
}#endregion#region執行查詢SQL語句,返回是否存在;
OracleDataReader reader=OracleHelper.ExecuteReader(sqlCount);while(reader.Read())
{//存在去修改
}public static OracleDataReader ExecuteReader(string strSQL, paramsOracleParameter[] parameters)
{
connection= newOracleConnection(connStr);
OracleCommand cmd= newOracleCommand(strSQL, connection);try{if (connection.State !=ConnectionState.Open)
{
connection.Open();
}
OracleDataReader myReader=cmd.ExecuteReader();returnmyReader;
}catch(OracleException e)
{
connection.Close();throw newException(e.Message);
}//finally//{//connection.Close();//}
}#endregion
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