关于数据库存储过程分页DatagridView BindingNavigator 控件的详细实现
参考了许多的资料和不断地调试，总算把这个问题弄清楚了。实现了一个简单的分页示例，虽然这样的做法不是太好。
程序有3个控件
BindingNavigator： 就是DataGridView控件上面的那个，在工程里名字： bindngrDemo
DataGridView: dgvDemo
BindingSource: 这个其实可以不要 bindseDemo
示例采用的是SQL SERVER的示例数据库pub
在pub数据库里写入分页存储过程
CREATE PROCEDURE [dbo].[Pagination] @Columns VARCHAR(500), -- The columns to be displayed, divide by comma @Tablename VARCHAR(100), -- The name of the table to be searched @OrderColumnName VARCHAR(100), -- The name of the column to be used in order @Order VARCHAR(50), -- The order method, ASC or DESC @Where VARCHAR(100), -- The where condition, if there is not conditon use 1=1 @PageIndex INT, -- Current page index @PageSize INT, -- The size of the page @PageCount INT OUTPUT -- The total page count,define as output parameter AS BEGIN DECLARE @SqlRecordCount NVARCHAR(100) -- The SQL Statement to get the total count of the records DECLARE @SqlSelect NVARCHAR(1000) -- The SQL SELECT statment SET @SqlRecordCount = N'SELECT @RecordCount = COUNT(*) FROM ' + @Tablename + ' WHERE ' +@Where DECLARE @RecordCount INT EXEC sp_executesql @SqlRecordCount, N'@RecordCount INT OUTPUT',@RecordCount OUTPUT -- Transfer the parameter dynamic IF(@RecordCount % @PageSize = 0) SET @PageCount = @RecordCount / @PageSize ELSE SET @PageCount = @RecordCount / @PageSize + 1 SET @SqlSelect = N'SELECT ' + @Columns + ' FROM(SELECT ROW_NUMBER() OVER (ORDER BY ' + @OrderColumnName +' ' + @Order + ') AS tempid, * FROM ' + @Tablename + ' WHERE ' + @Where + ') AS tempTableName WHERE tempid BETWEEN ' + STR((@PageIndex - 1)*@PageSize + 1) + ' AND ' + STR(@PageIndex * @PageSize) EXEC(@SqlSelect) END
下面的就是VS里的代码了：
在工程里定义几个变量：
public partial class frmDataPagination : Form { #region Define the page size static int pageSize = 20; static int pageCount = 0; #endregion ... }
上面2个变量，一个定义在数据库里分页时，每页的大小； 另一个用来接收存储过程分页时，输出的总页数。
在里面加入一个产生Select命令的函数，用于向sqlDataAdapter传递sql command.
private static SqlCommand GenerateSelectCommand(string Columns, string tableName, string orderColumnName, string order, string whereCondition, int pageIndex, int pageSize, SqlConnection conn) { SqlCommand sqlcmd = new SqlCommand("Pagination", conn); sqlcmd.CommandType = CommandType.StoredProcedure; sqlcmd.Parameters.AddWithValue("@Columns", Columns); sqlcmd.Parameters.AddWithValue("@Tablename", tableName); sqlcmd.Parameters.AddWithValue("@OrderColumnName", orderColumnName); sqlcmd.Parameters.AddWithValue("@Order", order); sqlcmd.Parameters.AddWithValue("@Where", whereCondition); sqlcmd.Parameters.AddWithValue("@PageIndex", pageIndex); sqlcmd.Parameters.AddWithValue("@PageSize", pageSize); SqlParameter pageCount = new SqlParameter("@PageCount", SqlDbType.Int); pageCount.Direction = ParameterDirection.Output; sqlcmd.Parameters.Add(pageCount); sqlcmd.UpdatedRowSource = UpdateRowSource.None; return sqlcmd; }
下面是LoadData函数， 在这个函数里面可以指定自己要选的table 以及列等等参数
里面有2种数据绑定
可以直接用sql command + Sql datareader
也可以sqldataAdapter + Dataset 或者Datatable
// Load the page data private static void LoadData(int pageIndex, DataGridView dgvDemo) { string strConn = "server = (local); Database = pubs; Integrated Security = SSPI"; try { using (SqlConnection conn = new SqlConnection(strConn)) { conn.Open(); // Use sqlcommand to fetch the data /* SqlCommand cmd = GenerateSelectCommand("fname", "employee", "fname", "ASC", "1=1", pageIndex, pageSize, conn); SqlDataReader rdr = cmd.ExecuteReader(); BindingSource bindseDemo = new BindingSource(); bindseDemo.DataSource = rdr; dgvDemo.DataSource = bindseDemo; */ // Use SqlDataAdapter to fetch the data SqlDataAdapter sqlDa = new SqlDataAdapter(); sqlDa.SelectCommand = GenerateSelectCommand("fname, lname, hire_date", "employee", "fname", "ASC", "1=1", pageIndex, pageSize, conn); DataTable ds = new DataTable(); sqlDa.Fill(ds); pageCount = (int)sqlDa.SelectCommand.Parameters["@PageCount"].Value; BindingSource bindseDemo = new BindingSource(); bindseDemo.DataSource = ds; dgvDemo.DataSource = bindseDemo; sqlDa.Dispose(); // Use SqlDataAdapter Dataset to fetch the data /* DataSet ds = new DataSet(); SqlDataAdapter sqlDa = new SqlDataAdapter(); sqlDa.SelectCommand = GenerateSelectCommand("fname", "employee", "fname", "ASC", "1=1", pageIndex, pageSize, conn); sqlDa.Fill(ds); pageCount = (int)sqlDa.SelectCommand.Parameters["@PageCount"].Value; dgvDemo.DataSource = ds.Tables[0]; sqlDa.Dispose(); */ conn.Close(); } } catch (Exception ex) { MessageBox.Show(ex.Message, "Information:", MessageBoxButtons.OK, MessageBoxIcon.Information); } }
窗体Load的代码
private void frmDataPagination_Load(object sender, EventArgs e) { // Even if there is no records, there is no exception LoadData(1, dgvDemo); // Set the status of the BindingNavigator control if (pageCount == 0 || pageCount == 1) { bindngrDemo.MoveFirstItem.Enabled = false; bindngrDemo.MoveLastItem.Enabled = false; bindngrDemo.MoveNextItem.Enabled = false; bindngrDemo.MovePreviousItem.Enabled = false; } else { bindngrDemo.MoveFirstItem.Enabled = false; bindngrDemo.MoveLastItem.Enabled = true; bindngrDemo.MoveNextItem.Enabled = true; bindngrDemo.MovePreviousItem.Enabled = false; bindngrDemo.PositionItem.Text = "1"; bindngrDemo.CountItem.Text = "of {" + pageCount.ToString() + "}"; } }
BindingNavigator控件的几个事件
包括4个键
向后，最后，向前，最前
private void bindingNavigatorMoveNextItem_Click(object sender, EventArgs e) { int currentPage = Convert.ToInt32(bindngrDemo.PositionItem.Text); if (currentPage < pageCount) { int page = currentPage + 1; bindngrDemo.PositionItem.Text = page.ToString(); LoadData(page, dgvDemo); if (page == pageCount) { bindngrDemo.MoveNextItem.Enabled = false; bindngrDemo.MoveLastItem.Enabled = false; } if (page >= 2) { bindngrDemo.MovePreviousItem.Enabled = true; bindngrDemo.MoveFirstItem.Enabled = true; } } else { MessageBox.Show("This is the last page", "Information", MessageBoxButtons.OK, MessageBoxIcon.Information); } } private void bindingNavigatorMovePreviousItem_Click(object sender, EventArgs e) { int currentPage = Convert.ToInt32(bindngrDemo.PositionItem.Text); if (currentPage >= 2) { int page = currentPage - 1; bindngrDemo.PositionItem.Text = page.ToString(); LoadData(page, dgvDemo); if (page == 1) { bindngrDemo.MovePreviousItem.Enabled = false; bindngrDemo.MoveFirstItem.Enabled = false; } if (page <= pageCount) { bindngrDemo.MoveNextItem.Enabled = true; bindngrDemo.MoveLastItem.Enabled = true; } } else { MessageBox.Show("This is the first page", "Information", MessageBoxButtons.OK, MessageBoxIcon.Information); } } private void bindingNavigatorMoveLastItem_Click(object sender, EventArgs e) { LoadData(pageCount, dgvDemo); bindngrDemo.PositionItem.Text = pageCount.ToString(); bindngrDemo.MoveLastItem.Enabled = false; bindngrDemo.MoveNextItem.Enabled = false; bindngrDemo.MovePreviousItem.Enabled = true; bindngrDemo.MoveFirstItem.Enabled = true; } private void bindingNavigatorMoveFirstItem_Click(object sender, EventArgs e) { LoadData(1, dgvDemo); bindngrDemo.PositionItem.Text = "1"; bindngrDemo.MoveFirstItem.Enabled = false; bindngrDemo.MovePreviousItem.Enabled = false; bindngrDemo.MoveNextItem.Enabled = true; bindngrDemo.MoveLastItem.Enabled = true; } }
至此就全部完了，里面其他的部分就由自己编写了，比如DataGridView控件的显示等等