sql server 2000关于开始日期，结束日期的查询

在平时的开发中，经常会用到基于某个时间段的查询，比如选择开始日期、结束日期.（yyyy-MM-dd格式），而在数据库表中该列存储的格式却是（yyyy-MM-dd HH:MM:SS）格式，这样就要用到如下转换

sbSql.Append(string.Format(" AND Convert(Char(10),RegisterDate,120)<='{0}'", endRegisterDate));

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public DataTable GetOvertureDocInfoList(string boName, int isSend, string startRegisterDate, string endRegisterDate)
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{
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try
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{
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string strSql = "SELECT * FROM GovInfo_OvertureDocument WHERE '1'='1' ";
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StringBuilder sbSql = new StringBuilder(strSql);
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if (isSend > -1)
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{
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sbSql.Append(string.Format(" AND IsSend={0}",isSend));
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}
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if (startRegisterDate != "")
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{
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sbSql.Append(string.Format(" AND Convert(Char(10),RegisterDate,120)>='{0}'", startRegisterDate));
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}
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if (endRegisterDate != "")
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{
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sbSql.Append(string.Format(" AND Convert(Char(10),RegisterDate,120)<='{0}'", endRegisterDate));
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}
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//if (status != "")
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//{
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// sbSql.Append(string.Format("AND Status={0}", status));
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//}
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sbSql.Append(" ORDER BY registerdate DESC");
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SqlDBAccess dbaccess = new SqlDBAccess();
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DataSet ds = new DataSet();
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ds = dbaccess.ExecuteDataset(boName, CommandType.Text, sbSql.ToString());
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DataTable dt = ds.Tables[0];
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return dt;
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}
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catch (Exception e)
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{
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LogUtil.Log.Error(this, e);
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throw e;
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}
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}