背景：
临时提供一个简单的网页，供其他人浏览数据库（Oracel、MSSQL）的某些数据，并导出Excel。
支持在配置文件中随时添加或修改sql。
实现：
把sql语句等信息保存一个xml文件中，前端页面提供一个下拉框，可以选择不同类型的sql语句，查询结果（暂没分页需要）直接绑定到GridView。
开发环境：VS2015
NuGet引入库：NPOI、Oracle.ManagedDataAccess.Client
一、VS目录
├─App_Code │ DataBase.cs ---------数据库连接类 │ ExcelHelper.cs ---------导出Excel工具类 │ SqlEntity.cs ---------sql语句的实体类 │ SqlEntityList.cs---------把sql.xml转化为实体类 │ ├─App_Data │ sql.xml ---------sql语句 │ │ rpt.aspx ---------前端查询页面 │ rpt.aspx.cs --------- │ Web.config ---------配置数据库连接信息
二、代码
1、Web.config
<connectionStrings> <add name="OracleString" connectionString="Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=testdb)));Persist Security Info=True;User ID=dev;Password=123456" providerName="Oracle.ManagedDataAccess.Client"/> <add name="SqlServerString" connectionString="user id=sa; password=123456; database=test; server=localhost" providerName="System.Data.SqlClient"/> connectionStrings>
2、DataBase.cs
using System; using System.Collections; using System.Collections.Generic; using System.Data; using System.Data.Common; using System.Data.SqlClient; using System.Linq; using System.Web; using System.Web.Configuration; ////// DataBase 的摘要说明 /// public class DataBase { private DbConnection cnn;//抽象类型 private DbCommand cmd;//抽象类型 private DbProviderFactory provider; private string providerName; public DataBase(String connectionName) { providerName = WebConfigurationManager.ConnectionStrings[connectionName].ProviderName; provider = DbProviderFactories.GetFactory(providerName); cnn = provider.CreateConnection(); cnn.ConnectionString = WebConfigurationManager.ConnectionStrings[connectionName].ConnectionString; cmd = provider.CreateCommand(); cmd.Connection = cnn; } #region 执行不带参数的SQL语句 /// /// 执行SQL语句，返回影响的记录数 /// public int ExecuteSQL(string sql) { return ExecuteSQL(sql, null); } /// /// 执行多条SQL语句，实现数据库事务。 /// public int ExecuteSqlTran(List<string> sqlList) { int count = -1; cnn.Open(); DbTransaction tx = cnn.BeginTransaction(); try { cmd.Transaction = tx; for (int n = 0; n < sqlList.Count; n++) { string strsql = sqlList[n].ToString(); if (strsql.Trim().Length > 1) { cmd.CommandText = strsql; count = cmd.ExecuteNonQuery(); } } tx.Commit(); } catch (SqlException e) { tx.Rollback(); cnn.Close(); throw new Exception(e.Message); } return count; } /// /// 执行一条计算查询结果语句，返回查询结果（object）。 /// public int ExecuteScalar(string sql) { return ExecuteScalar(sql, null); } /// /// 执行查询语句，返回DataSet /// public DataSet GetDataSet(string sql) { return GetDataSet(sql, null); } /// /// 执行查询语句，返回DataSet /// public DataTable GetDataTable(string sql) { return GetDataSet(sql).Tables[0]; } /// /// 执行查询语句，返回DataReader(使用该方法切记要手工关闭DataReader和连接) /// public DbDataReader ExecuteReader(string sql) { return ExecuteReader(sql, null); } #endregion #region 执行带参数的SQL语句 /// /// 执行SQL语句，返回影响的记录数 /// public int ExecuteSQL(string sql, params DbParameter[] cmdParms) { try { CreateCommand(sql, cmdParms); int rows = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); return rows; } catch (SqlException e) { cnn.Close(); throw new Exception(e.Message); } } /// /// 执行多条SQL语句，实现数据库事务。 /// public int ExecuteSqlTran(Hashtable sqlList) { int count = -1; cnn.Open(); DbTransaction tx = cnn.BeginTransaction(); try { cmd.Transaction = tx; foreach (DictionaryEntry myDE in sqlList) { string cmdText = myDE.Key.ToString(); DbParameter[] cmdParms = (DbParameter[])myDE.Value; CreateCommand(cmdText, cmdParms); count = cmd.ExecuteNonQuery(); } tx.Commit(); } catch (SqlException e) { tx.Rollback(); cnn.Close(); throw new Exception(e.Message); } return count; } /// /// 执行一条计算查询结果语句，返回查询结果（object）。 /// public int ExecuteScalar(string sql, params DbParameter[] cmdParms) { try { CreateCommand(sql, cmdParms); object o = cmd.ExecuteScalar(); return int.Parse(o.ToString()); } catch (SqlException e) { cnn.Close(); throw new Exception(e.Message); } } /// /// 执行查询语句，返回DataSet /// public DataSet GetDataSet(string sql, params DbParameter[] cmdParms) { DataSet ds = new DataSet(); try { CreateCommand(sql, cmdParms); DbDataAdapter adapter = provider.CreateDataAdapter(); adapter.SelectCommand = cmd; adapter.Fill(ds); } catch (SqlException e) { cnn.Close(); throw new Exception(e.Message); } return ds; } /// /// 执行查询语句，返回DataTable /// public DataTable GetDataTable(string sql, params DbParameter[] cmdParms) { return GetDataSet(sql, cmdParms).Tables[0]; } /// /// 执行查询语句，返回DataReader(使用该方法切记要手工关闭DataReader和连接) /// public DbDataReader ExecuteReader(string sql, params DbParameter[] cmdParms) { try { CreateCommand(sql, cmdParms); DbDataReader myReader = cmd.ExecuteReader(); return myReader; } catch (SqlException e) { cnn.Close(); throw new Exception(e.Message); } } public DbParameter MakeParam(string ParamName, DbType DbType, Int32 Size, object Value) { DbParameter Param = cmd.CreateParameter(); Param.ParameterName = ParamName; Param.DbType = DbType; if (Size > 0) Param.Size = Size; if (Value != null) Param.Value = Value; return Param; } private DbCommand CreateCommand(string cmdText, DbParameter[] Prams) { return CreateCommand(CommandType.Text, cmdText, Prams); } private DbCommand CreateCommand(CommandType cmdType, string cmdText, DbParameter[] Prams) { if (cnn.State != ConnectionState.Open) cnn.Open(); cmd.CommandType = cmdType; cmd.CommandText = cmdText; if (Prams != null) { cmd.Parameters.Clear(); foreach (DbParameter Parameter in Prams) cmd.Parameters.Add(Parameter); } return cmd; } public DataSet GetDataSetByProc(string ProcName, DbParameter[] Params) { cnn.Open(); DbCommand cmd = CreateCommand(CommandType.StoredProcedure, ProcName, Params); DbDataAdapter adapter = provider.CreateDataAdapter(); adapter.SelectCommand = cmd; DataSet ds = new DataSet(); adapter.Fill(ds); cnn.Close(); return ds; } #endregion }
3、ExcelHelper.cs
using NPOI.SS.UserModel; using NPOI.XSSF.UserModel; using System; using System.Collections.Generic; using System.Data; using System.IO; using System.Linq; using System.Text; using System.Web; ////// ExcelHelper 的摘要说明 /// public class ExcelHelper { public static void ExportXlsx(DataTable dt, string strFileName) { HttpContext curContext = HttpContext.Current; MemoryStream ms = ExportXlsx(dt); curContext.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(strFileName, Encoding.UTF8) + ".xlsx"); curContext.Response.AddHeader("Content-Length", ms.ToArray().Length.ToString()); curContext.Response.ContentEncoding = Encoding.UTF8; curContext.Response.BinaryWrite(ms.ToArray()); ms.Close(); ms.Dispose(); curContext.Response.End(); } private static MemoryStream ExportXlsx(DataTable dt) { XSSFWorkbook workbook = new XSSFWorkbook(); ISheet sheet = null; int headRowIndex = 0; string sheetName = "Sheet1"; if (!string.IsNullOrEmpty(dt.TableName)) { sheetName = dt.TableName; } sheet = workbook.CreateSheet(sheetName); int rowIndex = 0; XSSFRow headerRow = (XSSFRow)sheet.CreateRow(headRowIndex); ICellStyle headStyle = workbook.CreateCellStyle(); headStyle.Alignment = HorizontalAlignment.Center; IFont font = workbook.CreateFont(); font.FontHeightInPoints = 10; font.Boldweight = 700; headStyle.SetFont(font); foreach (DataColumn column in dt.Columns) { headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName); headerRow.GetCell(column.Ordinal).CellStyle = headStyle; } foreach (DataRow row in dt.Rows) { rowIndex++; XSSFRow dataRow = (XSSFRow)sheet.CreateRow(rowIndex); foreach (DataColumn column in dt.Columns) { dataRow.CreateCell(column.Ordinal).SetCellValue(row[column].ToString()); } } MemoryStream ms = new MemoryStream(); workbook.Write(ms); ms.Flush(); return ms; } }
4、sql.xml
xml version="1.0" encoding="utf-8" ?>
<sql>
<item id="1" text="报表1" dbConnName="OracleString">
select * from tb
item>
<item id="2" text="报表2" dbConnName="SqlServerString">
select * from tb
item>
sql>
5、SqlEntity.cs
public class SqlEntity { public SqlEntity() { } public int Id { get; set; } public string text { get; set; } public string sql { get; set; } public string dbConnName { get; set; } }
6、SqlEntityList.cs
public class SqlEntityList { public ListGetXmlData(String xmlPath) { var list = new List (); XmlDocument xmlDoc = new XmlDocument(); xmlDoc.Load(xmlPath); XmlNodeList xnl = xmlDoc.SelectSingleNode("sql").ChildNodes; for (int i = 0; i < xnl.Count; i++) { int id = int.Parse(xnl.Item(i).Attributes["id"].Value); string text = xnl.Item(i).Attributes["text"].Value; string dbConnName = xnl.Item(i).Attributes["dbConnName"].Value; string sql = xnl.Item(i).InnerText; var model = new SqlEntity() { Id = id, text = text, dbConnName = dbConnName.ToLower(), sql = sql }; list.Add(model); } return list; } }
7、rpt.aspx
<div> <asp:DropDownList ID="ddlType" DataTextField="text" DataValueField="id" runat="server"> asp:DropDownList> <asp:Button runat="server" ID="btnQuery" Text="查询" OnClick="btnQuery_Click"/> <asp:Literal runat="server" ID="ltlInfo">asp:Literal> <asp:Button runat="server" ID="btnExport" Text="导出" OnClick="btnExport_Click" /> div> <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="true" Width="100%">asp:GridView>
8、rpt.aspx.cs
protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { ddlType.DataSource = getSqlList(); ddlType.DataBind(); } } private ListgetSqlList() { String path = Server.MapPath("~/App_Data/sql.xml"); SqlEntityList sqlEntityList = new SqlEntityList(); List list = sqlEntityList.GetXmlData(path); return list; } private DataSet getDataSet(int type) { DataSet ds = new DataSet(); List list = getSqlList(); var m = list.FirstOrDefault(t => t.Id == type); DataBase db = new DataBase(m.dbConnName); ds = db.GetDataSet(m.sql); ltlInfo.Text = "记录数:" + ds.Tables[0].Rows.Count.ToString(); return ds; } private void BindData(DataSet ds) { GridView1.DataSource = ds; GridView1.DataBind(); } protected void btnQuery_Click(object sender, EventArgs e) { int type = int.Parse(ddlType.SelectedValue); DataSet ds = getDataSet(type); BindData(ds); } protected void btnExport_Click(object sender, EventArgs e) { int type = int.Parse(ddlType.SelectedValue); DataSet ds = getDataSet(type); DataTable dt = ds.Tables[0]; String fileName = ddlType.SelectedItem.Text; ExcelHelper.ExportXlsx(dt, fileName); }