多条件搜索分页的实现

　　对教材列表进行展示的时候，可以有条件的筛选结果，前台用到的是EasyUI DataGrid,后台接受查询参数，返回结果。

这里只写成后台，数据访问层中实现的关键代码。

View Code

/// <summary>
/// 默认下获取分页数据
/// </summary>
/// <param name="pageIndex">当前页码</param>
/// <param name="pageSize">每一页的行数</param>
/// <returns>BookID,BookName,Author,UserName,AcaName,Category,[State],AddDate,LastUpdateTime</returns>
public DataTable GetPagedModel(int pageIndex, int pageSize)
{
string strOrder = "order by AddDate DESC";
string strSQL = string.Format(@"select * from
(select BookID,BookName,Author,UserName,AcaName,Category,[State],AddDate,LastUpdateTime,ROW_NUMBER() over({0}) as num from ViewBookInfo where IsDel=0) as tb
where num between {1}*({2}-1)+1 and {1}*{2} {0} ", strOrder, pageSize, pageIndex);

return  SQLHelper.GetDataTable(strSQL);
}

/// <summary>
/// 含参数的查询
/// </summary>
/// <param name="pageIndex"></param>
/// <param name="pageSize"></param>
/// <param name="paras">BookName、ClassName、DeptID、DeptPID、Category、[State]</param>
/// <returns>BookID,BookName,Author,UserName,AcaName,Category,[State],AddDate,LastUpdateTime</returns>
public DataTable GetPagedModel(int pageIndex, int pageSize, Hashtable ht)
{
string strCondition;
List<SqlParameter> parasList;
string sOrder=" order by AddDate DESC";

//获取参数
GetSearchCondition(ht,out strCondition,out parasList);

string strSQL = string.Format(@"select * from (select BookID,BookName,Author,UserName,AcaName,Category,[State],AddDate,LastUpdateTime,ROW_NUMBER() over({0}) as num from ViewBookInfo where IsDel=0 {3}) as tb
where num between {1}*({2}-1)+1 and {1}*{2} {0} ", sOrder , pageSize, pageIndex,strCondition);

return SQLHelper.GetDataTable(strSQL,parasList.ToArray());

}

/// <summary>
/// 获取详细信息
/// </summary>
/// <param name="BookID"></param>
/// <returns></returns>
public DataTable GetDetail(int BookID)
{
string strSQL = "select ClassTarget,BookFeature from BookInfo where BookID="+BookID;

return SQLHelper.GetDataTable(strSQL);
}
/// <summary>
/// 含参数记录的条数
/// </summary>
/// <param name="ht">BookName、ClassName、DeptID、DeptPID、Category、[State]</param>
/// <returns></returns>
public int GetRecordCount(Hashtable ht)
{
string strCondition;
List<SqlParameter> parasList;

//获取参数
GetSearchCondition(ht, out strCondition, out parasList);

string strSQL = string.Format("select count(0) from ViewBookInfo where IsDel=0 {0} ", strCondition);

return Convert.ToInt32(SQLHelper.ExecuteScalar(strSQL, parasList.ToArray()));
}

/// <summary>
/// 装配查询参数,获取查询要的字符串，和参数集合
/// </summary>
/// <param name="ht">BookName、ClassName、DeptID、DeptPID、Category、[State]</param>
/// <param name="sOrder"></param>
/// <param name="paras"></param>
private void GetSearchCondition(Hashtable ht, out string contString, out List<SqlParameter> paras)
{
StringBuilder sOrder = new StringBuilder();
paras=new List<SqlParameter>();

if (ht.Count == 0)
{
contString = "";
return;
}

object oBookName = ht["BookName"];
object oClassName = ht["ClassName"];
object oDeptID = ht["DeptID"];
object oDeptPID = ht["DeptPID"];
object oCategory = ht["Category"];
object oState = ht["State"];

//书名
if (oBookName != null && !string.IsNullOrEmpty(oBookName.ToString()))
{
sOrder.Append(" and BookName like @BookName or  BookPY like @BookName");
paras.Add(new SqlParameter("@BookName",oBookName.ToString()+"%"));
}
//课程名
if(oClassName!=null&&!string.IsNullOrEmpty(oClassName.ToString()))
{
sOrder.Append(" and  ClassName like @ClassName ");
paras.Add(new SqlParameter("@ClassName",oClassName.ToString()+"%"));
}
//部门ID
if (oDeptID != null && !string.IsNullOrEmpty(oDeptID.ToString()))
{
sOrder.Append(" and DeptID=@DeptID ");
paras.Add(new SqlParameter("@DeptID",Convert.ToInt32(oDeptID)));
}

//上级部门PID
if (oDeptPID != null && !string.IsNullOrEmpty(oDeptPID.ToString()))
{
sOrder.Append(" and DeptPID=@DeptPID ");
paras.Add(new SqlParameter("@DeptPID",Convert.ToInt32(oDeptPID)));
}

//种类Category
if (oCategory != null && !string.IsNullOrEmpty(oCategory.ToString()))
{
sOrder.Append(" and Category=@Category ");
paras.Add(new SqlParameter("@Category",oCategory.ToString()));
}

//状态State
if (oState != null && !string.IsNullOrEmpty(oState.ToString()))
{
sOrder.Append(" and [State]=@State ");
paras.Add(new SqlParameter("@State",oState.ToString()));
}

contString = sOrder.ToString();

}

　　条件查询中Hashtable存储的是筛选的字段和其对应的值。