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        }