昨天帮朋友做了个小工具，以完成多表连接处理一些数据。今天下班后又做了份使用文档，不知友能看懂否？现将使用文档及源码发布如下，以供有同样需求的朋友下载。
使用文档
一、增、改、查、删
1、增（向sheet中插入数据）：
INSERT INTO [Employee$](EmployeeId,EmployeeName,BranchId) VALUES('YG2014120001','韩兆新','BM20141201');
执行Sql前：
执行Sql后：
2、改（更新sheet中的数据）:
UPDATE [Employee$] SET BranchId = 'BM20141202';
执行Sql前：
执行Sql后：
3、查（在sheet中查询数据）:
SELECT EmployeeId,EmployeeName,BranchId FROM [Employee$];
4、删（从sheet中删除数据）:
显然不支持！
二、WHERE：（WHERE在修改、查询中的应用）
1、修改：
UPDATE [Employee$] SET EmployeeID=null,EmployeeName=null,BranchId=null WHERE EmployeeID='YG2014120003';
执行Sql前：
执行Sql后：
2、查询：
SELECT EmployeeId,EmployeeName,BranchId FROM [Employee$] WHERE EmployeeID = 'YG2014120002';
三、LIKE与通配符
SELECT * FROM [Employee$] WHERE EmployeeID LIKE 'YG201412%';
1、*：所有列的名称；
2、%：通配n个字符；
3、_：通配1个字符。
四、排序（ORDER BY）
1、升序：（ASC）可省略；
2、降序：（DSEC）。
示例1：（升序排序）
SELECT * FROM [Employee$] ORDER BY EmployeeId DESC;
示例2：（降序排序）
SELECT * FROM [Employee$] ORDER BY EmployeeId DESC;
示例3：（升序排序简写）
SELECT * FROM [Employee$] ORDER BY EmployeeId;
五、多sheet连接
先建立两个用于演示的sheet：
Characters：
| ID | Character |
| 1 | 内向 |
| 2 | 外向 |
| 3 | 中性性格 |
Colors：
| ID | Color |
| 1 | 绿色 |
| 2 | 红色 |
| 4 | 蓝色 |
1、内连接：
内连接（JOIN 或 INNER JOIN）：内连接取交集
示意图：
SELECT * FROM [characters$] INNER JOIN [colors$] ON [characters$].ID = [colors$].ID;
2、外连接：
外连接可分为：左连接、右连接、完全外连接。
（1）左连接（LEFT JOIN）：
示意图：
SELECT * FROM [characters$] LEFT JOIN [colors$] ON [characters$].ID = [colors$].ID;
结果：
（2）右连接（RIGHT JOIN）：
示意图：
SELECT * FROM [characters$] RIGHT JOIN [colors$] ON [characters$].ID = [colors$].ID;
结果：
（3）完全外连接：
示意图：
SELECT * FROM [characters$] LEFT JOIN [colors$] ON [characters$].ID = [colors$].ID
UNION
SELECT * FROM [characters$] RIGHT JOIN [colors$] ON [characters$].ID = [colors$].ID;
结果：
3、交叉连接（ CROSS JOIN ）：
交叉连接产生连接所涉及的表的笛卡尔积。
SELECT * FROM [characters$],[colors$];
结果：
4、补充：
1、如下可获取内连接结果：
SELECT * FROM [characters$],[colors$] WHERE [characters$].ID = [colors$].ID;
2、如下可获取交叉连接结果：
SELECT * FROM [characters$],[colors$];
源码：
Program.cs
using System;
using System.IO;
using System.Windows.Forms;
namespace SqlExcel
{
static class Program
{
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Sunisoft.IrisSkin.SkinEngine skinEngine = new Sunisoft.IrisSkin.SkinEngine();
string skinPath = Application.StartupPath + Path.DirectorySeparatorChar + "skin" + Path.DirectorySeparatorChar + "skin.ssk";
skinEngine.SkinFile = skinPath;
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new MainForm());
}
}
}
MainForm.cs
using System;
using System.Data;
using System.Data.Common;
using System.Drawing;
using System.Windows.Forms;
namespace SqlExcel
{
public partial class MainForm : Form
{
public MainForm()
{
InitializeComponent();
}
/// <summary>
/// 输入文件选择
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnInFile_Click(object sender, EventArgs e)
{
OpenFileDialog openFileDlg = new OpenFileDialog();
openFileDlg.Filter = "Excel 2003文件|*.xls|Excel 2007文件|*.xlsx";
if (DialogResult.OK.Equals(openFileDlg.ShowDialog()))
{
txtInFile.Text = openFileDlg.FileName;
}
}
/// <summary>
/// 执行Sql...
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnExecute_Click(object sender, EventArgs e)
{
if (string.IsNullOrEmpty(txtInFile.Text.Trim()))
{
MessageBox.Show("请选择输入文件！", "操作提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}
if (string.IsNullOrEmpty(txtSql.Text.Trim()))
{
MessageBox.Show("请输入Sql语句！", "操作提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}
int linesNum = 0;
double executionTime = 0.0;
string resultInfo = string.Empty;
DataTable dtResult = null;
tabResult.SelectedTab = tPageResultInfo;
try
{
if (txtSql.Text.ToLower().StartsWith("select"))
{
executionTime = CodeTimer.ExecuteCode(delegate()
{
dtResult = SqlHelper.ExecuteDataTable(txtInFile.Text, txtSql.Text);
});
tabResult.SelectedTab = tPageResult;
}
else
{
executionTime = CodeTimer.ExecuteCode(delegate()
{
linesNum = SqlHelper.ExecuteNonQuery(txtInFile.Text, txtSql.Text);
});
}
resultInfo = FormatResultInfo(txtSql.Text, linesNum, executionTime);
}
catch (Exception ex)
{
if (ex.Message.Equals("未在本地计算机上注册“Microsoft.Ace.OLEDB.12.0”提供程序。"))
{
MessageBox.Show("本程序运行需安装：AccessDatabaseEngine，\r\n请安装后重试！", "系统警告", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
else if (ex is DbException)
{
MessageBox.Show(string.Format("Sql语句错误：“{0}”", ex.Message), "操作提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else
{
MessageBox.Show(string.Format("发生未处理错误，请联系作者！\r\n错误信息：“{0}”", ex.Message), "系统错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
resultInfo = FormatResultInfo(txtSql.Text, ex.Message);
}
finally
{
gvResult.DataSource = dtResult;
txtResultInfo.Text = resultInfo;
}
}
/// <summary>
/// 到处结果数据
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnExport_Click(object sender, EventArgs e)
{
DataTable dt = gvResult.DataSource as DataTable;
if (null == dt)
{
MessageBox.Show("无操作结果！", "操作提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}
SaveFileDialog saveFileDlg = new SaveFileDialog();
saveFileDlg.Filter = "Excel 2003文件|*.xls|Excel 2007文件|*.xlsx";
if (DialogResult.OK.Equals(saveFileDlg.ShowDialog()))
{
try
{
ExcelHelper.DataTableToExcel(dt, "result", saveFileDlg.FileName);
MessageBox.Show("导出成功", "操作提示", MessageBoxButtons.OK, MessageBoxIcon.None);
}
catch (Exception ex)
{
MessageBox.Show(string.Format("导出失败，原因：“{0}”", ex.Message), "操作提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
}
//显示行号
private void gvResult_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
{
Rectangle rectangle = new Rectangle(e.RowBounds.Location.X,
e.RowBounds.Location.Y,
gvResult.RowHeadersWidth - 4,
e.RowBounds.Height);
TextRenderer.DrawText(e.Graphics, (e.RowIndex + 1).ToString(),
gvResult.RowHeadersDefaultCellStyle.Font,
rectangle,
gvResult.RowHeadersDefaultCellStyle.ForeColor,
TextFormatFlags.VerticalCenter | TextFormatFlags.Right);
}
#region 格式化Sql执行结果信息
private string FormatResultInfo(string sql, int linesNum, double executionTime)
{
return string.Format("[SQL]{0}\r\n受影响的行: {1}\r\n时间: {2}ms\r\n", sql, linesNum, executionTime);
}
private string FormatResultInfo(string sql, string errorInfo)
{
return string.Format("[SQL]{0}\r\n[Err]{1}", sql, errorInfo);
}
#endregion
}
}
SqlHelper.cs
using System;
using System.Configuration;
using System.Data;
using System.Data.OleDb;
namespace SqlExcel
{
static class SqlHelper
{
private static string GetConnectionString(string dataSource)
{
if (string.IsNullOrEmpty(dataSource))
{
throw new Exception("数据源不能为空！");
}
return string.Format(ConfigurationManager.ConnectionStrings["Conn"].ConnectionString, dataSource);
}
public static DataTable ExecuteDataTable(string dataSource, string sql, params OleDbParameter[] parameters)
{
using (OleDbConnection conn = new OleDbConnection(GetConnectionString(dataSource)))
{
using (OleDbCommand cmd = conn.CreateCommand())
{
cmd.CommandText = sql;
cmd.Parameters.AddRange(parameters);
using (OleDbDataAdapter da = new OleDbDataAdapter(cmd))
{
DataTable dt = new DataTable();
da.Fill(dt);
return dt;
}
}
}
}
public static int ExecuteNonQuery(string dataSource, string sql, params OleDbParameter[] parameters)
{
using (OleDbConnection conn = new OleDbConnection(GetConnectionString(dataSource)))
{
conn.Open();
using (OleDbCommand cmd = conn.CreateCommand())
{
cmd.CommandText = sql;
cmd.Parameters.AddRange(parameters);
return cmd.ExecuteNonQuery();
}
}
}
}
}
ExcelHelper.cs
using System;
using System.Data;
using System.IO;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
namespace SqlExcel
{
static class ExcelHelper
{
#region 导出DataTable到Excel（Author：hanzhaoxin/2014-12-12）
public static void DataTableToExcel(DataTable dtSource, string sheetName, string fileName)
{
string extension = Path.GetExtension(fileName);
IWorkbook workbook;
if (extension.Equals(".xls"))
{
workbook = new HSSFWorkbook();
}
else if (extension.Equals(".xlsx"))
{
workbook = new XSSFWorkbook();
}
else
{
throw new Exception("不是有效的Excel格式！");
}
ISheet sheet = workbook.CreateSheet(sheetName);
IRow headerRow = sheet.CreateRow(0);
foreach (DataColumn cl in dtSource.Columns)
{
headerRow.CreateCell(cl.Ordinal).SetCellValue(cl.ColumnName);
}
int rowIndex = 1;
foreach (DataRow dr in dtSource.Rows)
{
IRow dataRow = sheet.CreateRow(rowIndex);
foreach (DataColumn cl in dtSource.Columns)
{
#region SetCellValue
switch (cl.DataType.ToString())
{
case "System.String":
dataRow.CreateCell(cl.Ordinal).SetCellValue(dr[cl].ToString());
break;
case "System.DateTime":
DateTime dtCellValue = new DateTime();
DateTime.TryParse(dr[cl].ToString(), out dtCellValue);
dataRow.CreateCell(cl.Ordinal).SetCellValue(dtCellValue);
break;
case "System.Boolean":
bool blCellValue;
bool.TryParse(dr[cl].ToString(), out blCellValue);
dataRow.CreateCell(cl.Ordinal).SetCellValue(blCellValue);
break;
case "System.Int16":
case "System.Int32":
case "System.Int64":
case "System.Byte":
int iCellValue;
int.TryParse(dr[cl].ToString(), out iCellValue);
dataRow.CreateCell(cl.Ordinal).SetCellValue(iCellValue);
break;
case "System.Decimal":
case "System.Double":
double doubCellValue;
double.TryParse(dr[cl].ToString(), out doubCellValue);
dataRow.CreateCell(cl.Ordinal).SetCellValue(doubCellValue);
break;
case "System.DBNull":
dataRow.CreateCell(cl.Ordinal).SetCellValue("");
break;
default:
dataRow.CreateCell(cl.Ordinal).SetCellValue(dr[cl].ToString());
break;
}
#endregion
}
rowIndex++;
}
using (FileStream fs = File.OpenWrite(fileName))
{
workbook.Write(fs);
headerRow = null;
sheet = null;
workbook = null;
}
}
#endregion
}
}
CodeTimer.cs
using System.Diagnostics;
namespace SqlExcel
{
delegate void Action();
static class CodeTimer
{
public static double ExecuteCode(Action dgMethodName)
{
Stopwatch sw = new Stopwatch();
sw.Start();
dgMethodName.Invoke();
sw.Stop();
return sw.Elapsed.TotalMilliseconds;
}
}
}
App.config
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<connectionStrings>
<add name="Conn" connectionString="Provider=Microsoft.Ace.OLEDB.12.0;Extended Properties=Excel 12.0;Data Source={0};"/>
</connectionStrings>
</configuration>
下载
因该程序运行需注册“Microsoft.Ace.OLEDB.12.0”，考虑到很多朋友没有安装。后面也会给出下载“AccessDatabaseEngine.exe”的链接。
下载地址：
SqlExcel源码：http://files.cnblogs.com/hanzhaoxin/SqlExcel%E6%BA%90%E7%A0%81.zip
AccessDatabaseEngine：http://www.microsoft.com/zh-cn/download/details.aspx?id=13255