C#处理SQL的两种小方法

方法一:

public DataTable GetDptLst()
{
using (DataAccesser da = DataAccesser.GetInstance())
{
Database database = da.InnerDatabase;

StringBuilder strSql = new StringBuilder();
strSql.Append("SELECT DPT_CD /r/n");
strSql.Append(" ,DPT_N /r/n");
strSql.Append(" ,DPT_DIFF /r/n");
strSql.Append("FROM " + importDbName + ".dbo.MyTable /r/n");
strSql.Append("WHERE Some Condition");

DbCommand command = database.GetSqlStringCommand(strSql.ToString());
DataTable tbl = new DataTable();
tbl.Columns.Add("DPT_CD", Type.GetType("System.String"));
tbl.Columns.Add("DPT_N", Type.GetType("System.String"));
tbl.Columns.Add("DPT_DIFF", Type.GetType("System.String"));

da.FillDataTable(command, tbl);

return tbl;
}
}

方法二:

public MyDataBase.P0101_VIEW_01DataTable FillGridView(string year, string period)
{
using (DataAccesser da = DataAccesser.GetInstance())
{
MyDataBase.P0101_VIEW_01DataTable tbl = new MyDataBase.P0101_VIEW_01DataTable();

try
{
Database database = da.InnerDatabase;
da.BeginTransaction();

StringBuilder strSql = new StringBuilder();

strSql.Append("SELECT * /r/n");
strSql.Append("FROM P0101_VIEW_01 /r/n");
strSql.Append("WHERE YEAR = ");
strSql.Append(" @YEAR AND /r/n");
strSql.Append(" SEASON = ");
strSql.Append(" @SEASON /r/n");

DbCommand command = database.GetSqlStringCommand(strSql.ToString());

SqlParameter[] prams = { new SqlParameter("@YEAR", SqlDbType.VarChar),
new SqlParameter("@SEASON", SqlDbType.VarChar) };
prams[0].Value = year;
prams[1].Value = period;
foreach (SqlParameter parameter in prams)
{
command.Parameters.Add(parameter);
}

da.FillDataTable(command, tbl);
}
catch (Exception ex)
{
throw ex;
}

return tbl;
}
}

二者的主要区别是对新定义的变量tbl的处理不同,方法一是定义为DataTable类型,方法二是定义为MyDataBase.P0101_VIEW_01DataTable类型.

通过方法二查找,要求查找P0101_VIEW_01DataTable的各个字段,而方法二则是查找什么字段,就再往tbl中添加什么字段(tbl.Columns.Add).

个人认为方法一比较好.