C#2005 一個簡單的查詢介面程式碼：DataGridView使用、影象顯示、複合查詢樣例
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Data.OleDb;
using System.Runtime.InteropServices;
using FileControl;
namespace xxxxx
{
public partial class FrmFind : Form
{
private const int CLSLicenseMaxLength = 16; // 車牌字串最大長度
private const int CLSLaneMinNumber = 1; // 車道最小值
private const int CLSLaneMaxNumber = 255; // 車道最大值
private const int CLSSpeedMinNumber = 0; // 車速最小值
private const int CLSSpeedMaxNumber = 300; // 車速最大值
private const int CLSDefaultReturnRecord = 500; // 查詢預設返回記錄數目
private const int CLSDefaultLoadRecord = 8; // 啟動時預設返回記錄數目
private const int CLSOverSpeedStateNormal = 1303; // 一般超速狀態程式碼 小於等於50%
private const int CLSOverSpeedStateSerious = 1603; // 嚴重超速狀態程式碼 大於50%
private DataSet clsDSVehicle; // 記憶體中快取的資料庫表儲存在此物件中
private Image clsImageFull; // 影象顯示物件-全景
private Image clsImageSpecial; // 影象顯示物件-牌識用
private int clsPreviousRowIndex; // 前一次顯示記錄的行索引號（在DataSet中）
public FrmFind()
{
InitializeComponent();
clsPreviousRowIndex = -1; // 前一次行的索引號
}
private void FrmFind_Load(object sender, EventArgs e)
{
InitCompenent();
GetVehicleFromDatabase(CLSDefaultLoadRecord, "");
}
private void FrmFind_FormClosed(object sender, FormClosedEventArgs e)
{
if (clsImageFull != null)
{
clsImageFull.Dispose();
}
if (clsImageSpecial != null)
{
clsImageSpecial.Dispose();
}
if (clsDSVehicle != null)
{
clsDSVehicle.Dispose();
}
}
/// <summary>
/// 初始化介面上各個元件的狀態
/// </summary>
private void InitCompenent()
{
dtpTimeStart.Enabled = false;
dtpTimeEnd.Enabled = false;
txtLicenseFind.Enabled = false;
cboLicenseColor.Enabled = false;
cboLane.Enabled = false;
cboSpeedCompareSymbol.Enabled = false;
cboSpeed.Enabled = false;
InitDataGridView();
}
/// <summary>
/// 初始化DataGridView控制元件的狀態
/// </summary>
private void InitDataGridView()
{
dgvVehicle.AutoGenerateColumns = false;
dgvVehicle.AllowUserToOrderColumns = true;
dgvVehicle.AllowUserToAddRows = false;
dgvVehicle.AllowUserToDeleteRows = false;
// 設定奇數資料行的背景色
dgvVehicle.AlternatingRowsDefaultCellStyle.BackColor = SystemColors.InactiveCaptionText;
dgvVehicle.MultiSelect = false;
// 設定採用行選取模式
dgvVehicle.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
//dgvVehicle.VirtualMode = true // 如果含未繫結資料則必須選設為true
this.dgvVehicle.DataSource = this.bsVehicle;
DataGridViewTextBoxColumn colautoId = new DataGridViewTextBoxColumn();
colautoId.DataPropertyName = "autoId"; // 資料來源欄位
colautoId.HeaderText = "序號";
colautoId.Name = "自增長序號";
colautoId.Width = 40;
colautoId.SortMode = DataGridViewColumnSortMode.NotSortable; // 不允許按列排序
dgvVehicle.Columns.Add(colautoId);
DataGridViewTextBoxColumn colindex = new DataGridViewTextBoxColumn();
colindex.DataPropertyName = "index";
colindex.HeaderText = "索引";
colindex.Name = "車輛索引號";
colindex.Width = 40;
colindex.SortMode = DataGridViewColumnSortMode.NotSortable;
dgvVehicle.Columns.Add(colindex);
DataGridViewTextBoxColumn collicense = new DataGridViewTextBoxColumn();
collicense.DataPropertyName = "license";
collicense.HeaderText = "車牌號碼";
collicense.Name = "車牌號碼";
collicense.Width =70;
collicense.SortMode = DataGridViewColumnSortMode.NotSortable;
dgvVehicle.Columns.Add(collicense);
DataGridViewTextBoxColumn collicenseColor = new DataGridViewTextBoxColumn();
collicenseColor.DataPropertyName = "licenseColor";
collicenseColor.HeaderText = "顏色";
collicenseColor.Name = "車牌顏色";
collicenseColor.Width = 35;
collicenseColor.SortMode = DataGridViewColumnSortMode.NotSortable;
dgvVehicle.Columns.Add(collicenseColor);
DataGridViewTextBoxColumn collicenseType = new DataGridViewTextBoxColumn();
collicenseType.DataPropertyName = "licenseType";
collicenseType.HeaderText = "型別";
collicenseType.Name = "車牌型別";
collicenseType.Width = 0;
collicenseType.SortMode = DataGridViewColumnSortMode.NotSortable;
collicenseType.Visible = false;
dgvVehicle.Columns.Add(collicenseType);
DataGridViewTextBoxColumn colpassTime = new DataGridViewTextBoxColumn();
colpassTime.DataPropertyName = "passTime"; // 資料來源欄位
colpassTime.DefaultCellStyle.Format = "yyyy-MM-dd HH:mm:ss";
colpassTime.HeaderText = "通行時間";
colpassTime.Name = "通行時間";
colpassTime.Width = 125;
colpassTime.SortMode = DataGridViewColumnSortMode.NotSortable;
dgvVehicle.Columns.Add(colpassTime);
DataGridViewTextBoxColumn collocation = new DataGridViewTextBoxColumn();
collocation.DataPropertyName = "location"; // 資料來源欄位
collocation.HeaderText = "地點";
collocation.Name = "影象採集地點";
collocation.Width = 120;
collocation.SortMode = DataGridViewColumnSortMode.NotSortable;
dgvVehicle.Columns.Add(collocation);
DataGridViewTextBoxColumn collane = new DataGridViewTextBoxColumn();
collane.DataPropertyName = "lane"; // 資料來源欄位
collane.HeaderText = "車道";
collane.Name = "車道";
collane.Width = 35;
collane.SortMode = DataGridViewColumnSortMode.NotSortable;
dgvVehicle.Columns.Add(collane);
DataGridViewTextBoxColumn coltype = new DataGridViewTextBoxColumn();
coltype.DataPropertyName = "type"; // 資料來源欄位
coltype.HeaderText = "車型";
coltype.Name = "車型";
coltype.Width = 50;
coltype.SortMode = DataGridViewColumnSortMode.NotSortable;
dgvVehicle.Columns.Add(coltype);
DataGridViewTextBoxColumn coldirection = new DataGridViewTextBoxColumn();
coldirection.DataPropertyName = "direction"; // 資料來源欄位
coldirection.HeaderText = "方向";
coldirection.Name = "方向";
coldirection.Width = 35;
coldirection.SortMode = DataGridViewColumnSortMode.NotSortable;
dgvVehicle.Columns.Add(coldirection);
DataGridViewTextBoxColumn colspeed = new DataGridViewTextBoxColumn();
colspeed.DataPropertyName = "speed"; // 資料來源欄位
colspeed.HeaderText = "車速";
colspeed.Name = "車速";
colspeed.Width = 35;
colspeed.SortMode = DataGridViewColumnSortMode.NotSortable;
dgvVehicle.Columns.Add(colspeed);
DataGridViewTextBoxColumn colspeedLimit = new DataGridViewTextBoxColumn();
colspeedLimit.DataPropertyName = "speedLimit"; // 資料來源欄位
colspeedLimit.HeaderText = "限速";
colspeedLimit.Name = "限速";
colspeedLimit.Width = 35;
colspeedLimit.SortMode = DataGridViewColumnSortMode.NotSortable;
dgvVehicle.Columns.Add(colspeedLimit);
DataGridViewTextBoxColumn colstate = new DataGridViewTextBoxColumn();
colstate.DataPropertyName = "state"; // 資料來源欄位
colstate.HeaderText = "狀態";
colstate.Name = "車輛狀態";
colstate.Width = 40;
colstate.SortMode = DataGridViewColumnSortMode.NotSortable;
dgvVehicle.Columns.Add(colstate);
}
/// <summary>
/// DataGridView控制元件的當前單元格變化事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void dgvVehicle_CurrentCellChanged(object sender, EventArgs e)
{
if (dgvVehicle.CurrentRow != null)
{
if (clsPreviousRowIndex == dgvVehicle.CurrentRow.Index)
{
return;
}
else
{
clsPreviousRowIndex = dgvVehicle.CurrentRow.Index;
ShowCurrentRecord(dgvVehicle.CurrentRow.Index);
}
}
}
/// <summary>
/// 顯示當前記錄
/// </summary>
/// <param name="noRecordFlag">此引數為true時載入無記錄資訊</param>
private void ShowCurrentRecord(bool noRecordFlag)
{
if (noRecordFlag)
{
txtLicense.BackColor = Color.Gray;
txtLicense.Text = "";
lblCurrentVehicleDetail.Text = "";
picFull.Image = null;
picSpecial.Image = null;
}
}
/// <summary>
/// 顯示當前記錄
/// </summary>
/// <param name="recordIndex">此引數大於等於0時介面載入顯示DataSet中索引為recordIndex的記錄資訊</param>
private void ShowCurrentRecord(int recordIndex)
{
if (recordIndex < 0)
{
return;
}
string licenseColorCode = clsDSVehicle.Tables["tbVehicle"].Rows[recordIndex].ItemArray[4].ToString().Trim();
switch (licenseColorCode)
{
case "0":
txtLicense.BackColor = Color.White;
txtLicense.ForeColor = Color.Black;
break;
case "1":
txtLicense.BackColor = Color.Yellow;
txtLicense.ForeColor = Color.Black;
break;
case "2":
txtLicense.BackColor = Color.Blue;
txtLicense.ForeColor = Color.White;
break;
case "3":
txtLicense.BackColor = Color.Black;
txtLicense.ForeColor = Color.White;
break;
case "5": // 底色為綠色時字型色為白 2008-01-24從羅兵華處得知
txtLicense.BackColor = Color.Green;
txtLicense.ForeColor = Color.White;
break;
default:
txtLicense.BackColor = Color.Gray;
txtLicense.ForeColor = Color.Black;
break;
} //End Switch
txtLicense.Text = clsDSVehicle.Tables["tbVehicle"].Rows[recordIndex].ItemArray[2].ToString().Trim();
string detail = "";
detail = detail + "索引：" + clsDSVehicle.Tables["tbVehicle"].Rows[recordIndex].ItemArray[1].ToString();
detail = detail + "/r/n車牌號碼：" + clsDSVehicle.Tables["tbVehicle"].Rows[recordIndex].ItemArray[2].ToString();
detail = detail + "/r/n車牌顏色：" + clsDSVehicle.Tables["tbVehicle"].Rows[recordIndex].ItemArray[3].ToString();
detail = detail + "/r/n時間：" + clsDSVehicle.Tables["tbVehicle"].Rows[recordIndex].ItemArray[6].ToString();
detail = detail + "/r/n位置：" + clsDSVehicle.Tables["tbVehicle"].Rows[recordIndex].ItemArray[7].ToString();
detail = detail + "/r/n車道：" + clsDSVehicle.Tables["tbVehicle"].Rows[recordIndex].ItemArray[8].ToString();
detail = detail + "/r/n車型：" + clsDSVehicle.Tables["tbVehicle"].Rows[recordIndex].ItemArray[9].ToString();
detail = detail + "/r/n方向：" + clsDSVehicle.Tables["tbVehicle"].Rows[recordIndex].ItemArray[10].ToString();
//detail = detail + "/r/n小車限速：" + clsDSVehicle.Tables["tbVehicle"].Rows[recordIndex].ItemArray[13].ToString();
//detail = detail + "/r/n卡車限速：" + clsDSVehicle.Tables["tbVehicle"].Rows[recordIndex].ItemArray[14].ToString();
detail = detail + "/r/n本車限速：" + clsDSVehicle.Tables["tbVehicle"].Rows[recordIndex].ItemArray[15].ToString();
detail = detail + "/r/n觸發車速：" + clsDSVehicle.Tables["tbVehicle"].Rows[recordIndex].ItemArray[12].ToString();
detail = detail + "/r/n車速：" + clsDSVehicle.Tables["tbVehicle"].Rows[recordIndex].ItemArray[11].ToString();
if (CLSOverSpeedStateNormal == (int)clsDSVehicle.Tables["tbVehicle"].Rows[recordIndex].ItemArray[16])
{
detail = detail + "/r/n狀態：" + clsDSVehicle.Tables["tbVehicle"].Rows[recordIndex].ItemArray[16].ToString() + " 一般超速，超速小於等於50%";
}
else if (CLSOverSpeedStateSerious == (int)clsDSVehicle.Tables["tbVehicle"].Rows[recordIndex].ItemArray[16])
{
detail = detail + "/r/n狀態：" + clsDSVehicle.Tables["tbVehicle"].Rows[recordIndex].ItemArray[16].ToString() + " 嚴重超速，超速大於50%";
}
lblCurrentVehicleDetail.Text = detail + "/r/n";
try
{
string imageFullPath = clsDSVehicle.Tables["tbVehicle"].Rows[recordIndex].ItemArray[17].ToString().Trim();
if (File.Exists(imageFullPath))
{
if (clsImageFull != null)
{
clsImageFull.Dispose();
}
clsImageFull = Image.FromFile(imageFullPath);
picFull.Image = clsImageFull;
}
else
{
picFull.Image = null;
lblCurrentVehicleDetail.Text = lblCurrentVehicleDetail.Text + "未找到全景影象！";
}
string imageSpecialPath = clsDSVehicle.Tables["tbVehicle"].Rows[recordIndex].ItemArray[18].ToString().Trim();
if (File.Exists(imageSpecialPath))
{
if (clsImageSpecial != null)
{
clsImageSpecial.Dispose();
}
clsImageSpecial = Image.FromFile(imageSpecialPath);
picSpecial.Image = clsImageSpecial;
}
else
{
picSpecial.Image = null;
lblCurrentVehicleDetail.Text = lblCurrentVehicleDetail.Text + "未找到牌識影象！";
}
}
catch (Exception ex)
{
Log.WriteToFile("FrmFind.ShowCurrentRecord Exception","recordIndex=" + recordIndex.ToString() + " ex.Message: " + ex.ToString());
// 介面顯示影象載入異常資訊
lblCurrentVehicleDetail.Text = lblCurrentVehicleDetail.Text + "顯示影象發生異常！詳細請查閱日誌！";
}
}
private void chkTimeStart_CheckedChanged(object sender, EventArgs e)
{
if (chkTimeStart.Checked)
{
dtpTimeStart.Enabled = true;
dtpTimeStart.Value = DateTime.Now;
}
else
{
dtpTimeStart.Enabled = false;
}
}
private void chkTimeEnd_CheckedChanged(object sender, EventArgs e)
{
if (chkTimeEnd.Checked)
{
dtpTimeEnd.Enabled = true;
dtpTimeEnd.Value = DateTime.Now;
}
else
{
dtpTimeEnd.Enabled = false;
}
}
private void chkLicense_CheckedChanged(object sender, EventArgs e)
{
if (chkLicense.Checked)
{
txtLicenseFind.Enabled = true;
if (txtLicenseFind.Text.Length == 0)
{
txtLicenseFind.Text = "無車牌";
}
txtLicenseFind.Select();
}
else
{
txtLicenseFind.Enabled = false;
}
}
private void chkLicenseColor_CheckedChanged(object sender, EventArgs e)
{
if (chkLicenseColor.Checked)
{
cboLicenseColor.Enabled = true;
if (cboLicenseColor.SelectedIndex < 0)
{
cboLicenseColor.SelectedIndex = 2;
}
}
else
{
cboLicenseColor.Enabled = false;
}
}
private void chkLane_CheckedChanged(object sender, EventArgs e)
{
if (chkLane.Checked)
{
cboLane.Enabled = true;
if (cboLane.SelectedIndex < 0)
{
cboLane.SelectedIndex = 0;
}
}
else
{
cboLane.Enabled = false;
}
}
private void chkSpeed_CheckedChanged(object sender, EventArgs e)
{
if (chkSpeed.Checked)
{
cboSpeedCompareSymbol.Enabled = true;
if (cboSpeedCompareSymbol.SelectedIndex < 0)
{
cboSpeedCompareSymbol.SelectedIndex = 0;
}
cboSpeed.Enabled = true;
if (cboSpeed.Text.Length == 0)
{
cboSpeed.Text = "60";
}
}
else
{
cboSpeedCompareSymbol.Enabled = false;
cboSpeed.Enabled = false;
}
}
private void txtLicenseFind_Validated(object sender, EventArgs e)
{
int inputLicenseLength = txtLicenseFind.Text.Length;
if (inputLicenseLength > CLSLicenseMaxLength)
{
MessageBox.Show("您輸入的車牌字串的超過了長度限制，最長為" + CLSLicenseMaxLength.ToString() + "個字元！/r/n" + "一般車牌字串長度為7。/r/n" + "本軟體支援模糊查詢，例如您輸入：123,可以查詢所有含123的車牌號碼！", "請重新輸入！", MessageBoxButtons.OK, MessageBoxIcon.Stop);
txtLicenseFind.Focus();
txtLicenseFind.Select(0, inputLicenseLength);
}
}
private void cboLane_Validated(object sender, EventArgs e)
{
try
{
int lane = int.Parse(cboLane.Text);
if (lane < CLSLaneMinNumber || lane > CLSLaneMaxNumber)
{
MessageBox.Show("您輸入的車道號超出了允許範圍，必須為" + CLSLaneMinNumber.ToString() + "-" + CLSLaneMaxNumber.ToString() + "之間的數字！", "請重新輸入！", MessageBoxButtons.OK, MessageBoxIcon.Stop);
cboLane.Focus();
cboLane.Select(0, cboLane.Text.Length);
}
}
catch (Exception ex)
{
MessageBox.Show("您輸入的車道號不符合要求，導致以下異常產生：/r/n" + ex.Message + "/r/n輸入必須為" + CLSLaneMinNumber.ToString() + "-" + CLSLaneMaxNumber.ToString() + "之間的數字！", "請重新輸入！", MessageBoxButtons.OK, MessageBoxIcon.Stop);
cboLane.Text = "1";
cboLane.Focus();
cboLane.Select(0, cboLane.Text.Length);
}
}
private void cboSpeed_Validated(object sender, EventArgs e)
{
try
{
int speed = int.Parse(cboSpeed.Text);
if (speed < CLSSpeedMinNumber || speed > CLSSpeedMaxNumber)
{
MessageBox.Show("您輸入的車速超出了允許範圍，必須為" + CLSSpeedMinNumber.ToString() + "-" + CLSSpeedMaxNumber.ToString() + "之間的數字！", "請重新輸入！", MessageBoxButtons.OK, MessageBoxIcon.Stop);
cboSpeed.Focus();
cboSpeed.Select(0, cboSpeed.Text.Length);
}
}
catch (Exception ex)
{
MessageBox.Show("您輸入的車速不符合要求，導致以下異常產生：/r/n" + ex.Message + "/r/n輸入必須為" + CLSSpeedMinNumber.ToString() + "-" + CLSSpeedMaxNumber.ToString() + "之間的數字！", "請重新輸入！", MessageBoxButtons.OK, MessageBoxIcon.Stop);
cboSpeed.Text = "60";
cboSpeed.Focus();
cboSpeed.Select(0, cboSpeed.Text.Length);
}
}
private void btnFind_Click(object sender, EventArgs e)
{
this.Cursor = Cursors.WaitCursor;
string errorMsg = "";
if (!ValidateSqlParameter(ref errorMsg))
{
MessageBox.Show("您輸入的查詢條件不正確：/r/n" + errorMsg + "/r/n請重新選擇查詢條件！", "錯誤提示！", MessageBoxButtons.OK, MessageBoxIcon.Stop);
this.Cursor = Cursors.Arrow;
return;
}
GetVehicleFromDatabase(0, GetSearchSqlCommand(0));
this.Cursor = Cursors.Arrow;
}
/// <summary>
/// 驗證Sql查詢條件間的引數有效性
/// </summary>
/// <param name="errorMsg">檢測到錯誤則寫入錯誤資訊並立即返回</param>
/// <returns>全部有效返回 true；否則返回false，並將錯誤資訊寫入errorMsg</returns>
private bool ValidateSqlParameter(ref string errorMsg)
{
string timeStart;
string timeEnd;
errorMsg = null;
if (chkTimeStart.Checked && chkTimeEnd.Checked)
{
timeStart = dtpTimeStart.Value.ToString("yyyy-MM-dd HH:mm:ss");
timeEnd = dtpTimeEnd.Value.ToString("yyyy-MM-dd HH:mm:ss");
if ((dtpTimeStart.Value > dtpTimeEnd.Value) && (!timeStart.Equals(timeEnd)))
{
errorMsg = "終止時間必須大於等於起始時間！/r/n" + "本次查詢終止時間：" + dtpTimeEnd.Value.ToString() + " 小於起始時間：" + dtpTimeStart.Value.ToString();
return false;
}
}
return true;
}
/// <summary>
/// 獲取查詢語句【目前只支援Access資料庫】
/// </summary>
/// <param name="databaseType">資料庫型別 0 Access；1 MySql；2 Sql Server；3 Oracle</param>
/// <returns>返回查詢語句</returns>
private string GetSearchSqlCommand(int databaseType)
{
string sqlCommand;
string timeStart;
string timeEnd;
bool otherChecked = false;
if (chkNotLimitReturnRecord.Checked)
{
sqlCommand = "select * from tbVehicle";
}
else
{
sqlCommand = "select top " + CLSDefaultReturnRecord.ToString() + " * from tbVehicle";
}
if (chkTimeStart.Checked)
{
if (otherChecked)
{
sqlCommand = sqlCommand + " and ";
}
else
{
sqlCommand = sqlCommand + " where ";
}
timeStart = dtpTimeStart.Value.ToString("yyyy-MM-dd HH:mm:ss");
if (0 == databaseType) // 如果是Access資料，時間標識字元不一樣
{
sqlCommand = sqlCommand + "passTime >=" + "#" + timeStart + "#";
}
else
{
sqlCommand = sqlCommand + "passTime >=" + "'" + timeStart + "'";
}
otherChecked = true;
}
if (chkTimeEnd.Checked)
{
if (otherChecked)
{
sqlCommand = sqlCommand + " and ";
}
else
{
sqlCommand = sqlCommand + " where ";
}
timeEnd = dtpTimeEnd.Value.ToString("yyyy-MM-dd HH:mm:ss");
if (0 == databaseType) // 如果是Access資料，時間標識字元不一樣
{
sqlCommand = sqlCommand + "passTime <=" + "#" + timeEnd + "#";
}
else
{
sqlCommand = sqlCommand + "passTime <=" + "'" + timeEnd + "'";
}
otherChecked = true;
}
if (chkLicense.Checked)
{
if (otherChecked)
{
sqlCommand = sqlCommand + " and ";
}
else
{
sqlCommand = sqlCommand + " where ";
}
sqlCommand = sqlCommand + "license like " + "'%" + txtLicenseFind.Text.Trim() + "%'";
otherChecked = true;
}
if (chkLicenseColor.Checked)
{
if (otherChecked)
{
sqlCommand = sqlCommand + " and ";
}
else
{
sqlCommand = sqlCommand + " where ";
}
sqlCommand = sqlCommand + "licenseColor = " + "'" + cboLicenseColor.Text.Trim() + "'";
otherChecked = true;
}
if (chkLane.Checked)
{
if (otherChecked)
{
sqlCommand = sqlCommand + " and ";
}
else
{
sqlCommand = sqlCommand + " where ";
}
sqlCommand = sqlCommand + "lane = " + cboLane.Text.Trim();
otherChecked = true;
}
if (chkSpeed.Checked)
{
if (otherChecked)
{
sqlCommand = sqlCommand + " and ";
}
else
{
sqlCommand = sqlCommand + " where ";
}
switch (cboSpeedCompareSymbol.SelectedIndex)
{
case 0:
sqlCommand = sqlCommand + "Speed >= " + cboSpeed.Text.Trim();
break;
case 1:
sqlCommand = sqlCommand + "Speed = " + cboSpeed.Text.Trim();
break;
case 2:
sqlCommand = sqlCommand + "Speed <= " + cboSpeed.Text.Trim();
break;
default:
sqlCommand = sqlCommand + "Speed >= " + cboSpeed.Text.Trim();
break;
} //End Switch
otherChecked = true;
}
if (chkOrderByPassTime.Checked)
{
sqlCommand = sqlCommand + " order by passTime";
}
return sqlCommand;
}
/// <summary>
/// 從資料庫裝載車輛資訊
/// </summary>
/// <param name="recordNumber">當此引數大於0小於CLSDefaultReturnRecord時，返回前recordNumber條記錄</param>
/// <param name="sqlCommand">當recordNumber無效時用指定查詢語句查詢</param>
private void GetVehicleFromDatabase(int recordNumber,string sqlCommand)
{
try
{
if (clsDSVehicle != null)
{
clsDSVehicle.Clear();
clsDSVehicle.Dispose();
}
if (recordNumber > 0 && recordNumber < CLSDefaultReturnRecord)
{
clsDSVehicle = DataAccess.GetDataSet("select top " + recordNumber.ToString() + " * from tbVehicle");
}
else
{
clsDSVehicle = DataAccess.GetDataSet(sqlCommand);
}
if (clsDSVehicle != null)
{
clsDSVehicle.Tables[0].TableName = "tbVehicle";
if (clsDSVehicle.Tables[0].Rows.Count <= 0)
{
// 顯示無資訊
ShowCurrentRecord(true);
return;
}
this.bsVehicle.DataSource = clsDSVehicle;
this.bsVehicle.DataMember = "tbVehicle";
this.bsVehicle.AllowNew = false;
this.bnVehicle.BindingSource = this.bsVehicle;
clsPreviousRowIndex = -1;
}
else
{
// 異常
ShowCurrentRecord(true);
MessageBox.Show("從資料庫查詢時發生異常，可能是表tbVehicle不存在！/r/n" + "recordNumber=" + recordNumber.ToString() + "/r/nsqlCommand=" + sqlCommand, "錯誤提示！", MessageBoxButtons.OK, MessageBoxIcon.Warning);
Log.WriteToFile("FrmFind.GetVehicleFromDatabase", "clsDSVehicle == null recordNumber=" + recordNumber.ToString() + " sqlCommand=" + sqlCommand);
}
}
catch (Exception ex)
{
MessageBox.Show("從資料庫查詢時發生以下異常：/r/n" + ex.Message , "錯誤提示！", MessageBoxButtons.OK, MessageBoxIcon.Warning);
Log.WriteToFile("FrmFind.GetVehicleFromDatabase exception", "recordNumber=" + recordNumber.ToString() + " sqlCommand=" + sqlCommand + " ex.Message=" + ex.Message);
}
}
}
}