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));

1public DataTable GetOvertureDocInfoList(string boName, int isSend, string startRegisterDate, string endRegisterDate)
2;;;;;{
3;try
4;{
5;;;;;string strSql = "SELECT * FROM GovInfo_OvertureDocument WHERE '1'='1' ";
6;;;;;StringBuilder sbSql = new StringBuilder(strSql);
7
8;;;;;if (isSend > -1)
9;;;;;{
10;sbSql.Append(string.Format(" AND IsSend={0}",isSend));
11;;;;;}
12
13;;;;;if (startRegisterDate != "")
14;;;;;{
15;sbSql.Append(string.Format(" AND Convert(Char(10),RegisterDate,120)>='{0}'", startRegisterDate));
16;;;;;}
17;;;;;if (endRegisterDate != "")
18;;;;;{
19;sbSql.Append(string.Format(" AND Convert(Char(10),RegisterDate,120)<='{0}'", endRegisterDate));
20;;;;;}
21
22;;;;;//if (status != "")
23;;;;;//{
24;;;;;//;sbSql.Append(string.Format("AND Status={0}", status));
25;;;;;//}
26
27;;;;;sbSql.Append(" ORDER BY registerdate DESC");
28
29;;;;;SqlDBAccess dbaccess = new SqlDBAccess();
30;;;;;DataSet ds = new DataSet();
31;;;;;ds = dbaccess.ExecuteDataset(boName, CommandType.Text, sbSql.ToString());
32;;;;;DataTable dt = ds.Tables[0];
33
34;;;;;return dt;
35;}
36;catch (Exception e)
37;{
38;;;;;LogUtil.Log.Error(this, e);
39;;;;;throw e;
40;}
41;;;;;}