C# SQL 多条件查询技巧

C# SQL 多条件查询技巧

2013-03-05 15:04 5843人阅读 评论(0) 收藏 举报


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C#_SQL多条件查询技巧

#region 多条件搜索时，使用List集合来拼接条件（拼接Sql）

StringBuilder sql = new StringBuilder("select * from PhoneNum");

List<string> wheres = new List<string>();

if (cboGroup.SelectedIndex != 0)

{

wheres.Add(" ptypeid=" + cboGroup.Text.Split('|')[0]);

}

if (txtSearchName.Text.Trim().Length > 0)

{

wheres.Add(" pname like '%" + txtSearchName.Text.Trim() + "%'");

}

if (txtSearchCellPhone.Text.Trim().Length > 0)

{

wheres.Add(" pcellphone like '%" + txtSearchCellPhone.Text.Trim() + "%'");

}

//判断用户是否选择了条件

if (wheres.Count > 0)

{

string wh = string.Join(" and ", wheres.ToArray());

sql.Append(" where " + wh);

}

#endregion

#region 多条件搜索使用带参数的sql语句

StringBuilder sql = new StringBuilder("select * from PhoneNum");

List<string> wheres = new List<string>();

List<SqlParameter> listParameter = new List<SqlParameter>();

if (cboGroup.SelectedIndex != 0)

{

wheres.Add(" ptypeid=@typeid ");

listParameter.Add(new SqlParameter("@typeid", cboGroup.Text.Split('|')[0]));

}

if (txtSearchName.Text.Trim().Length > 0)

{

wheres.Add(" pname like @pname ");

//pname like '%乔%'

//pname liek '%'+@pname+'%'

listParameter.Add(new SqlParameter("@pname", "%" + txtSearchName.Text.Trim() + "%"));

}

if (txtSearchCellPhone.Text.Trim().Length > 0)

{

wheres.Add(" pcellphone like @cellphone ");

listParameter.Add(new SqlParameter("@cellphone", "%" + txtSearchCellPhone.Text.Trim() + "%"));

}

//判断用户是否选择了条件

if (wheres.Count > 0)

{

string wh = string.Join(" and ", wheres.ToArray());

sql.Append(" where " + wh);

}

SqlHelper.ExecuteDataTable(sql.ToString(), listParameter.ToArray());

#endregion