实例介绍
【实例简介】
基于SQL语句新建，添加，查找，等操作
【实例截图】
【核心代码】
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 | using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Data;using System.Data.OleDb;using ADOX;using System.Collections;using System.IO;namespace Access数据库{ public partial class Form1 : Form { public Form1() { InitializeComponent(); } #region //access调用方法 //创建mdb public bool CreateMDBDataBase(string mdbPath) { try { ADOX.CatalogClass cat = new ADOX.CatalogClass(); cat.Create("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" mdbPath ";"); cat = null; return true; } catch { return false; } } // 新建mdb的表 //mdbHead是一个ArrayList，存储的是table表中的具体列名。 public static bool CreateMDBTable(string mdbPath, string tableName, ArrayList mdbHead) { try { ADOX.CatalogClass cat = new ADOX.CatalogClass(); string sAccessConnection = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" mdbPath; ADODB.Connection cn = new ADODB.Connection(); cn.Open(sAccessConnection, null, null, -1); cat.ActiveConnection = cn; //新建一个表 ADOX.TableClass tbl = new ADOX.TableClass(); tbl.ParentCatalog = cat; tbl.Name = tableName; int size = mdbHead.Count; for (int i = 0; i < size; i ) { //增加一个文本字段 ADOX.ColumnClass col2 = new ADOX.ColumnClass(); col2.ParentCatalog = cat; col2.Name = mdbHead[i].ToString();//列的名称 col2.Properties["Jet OLEDB:Allow Zero Length"].Value = false; tbl.Columns.Append(col2, ADOX.DataTypeEnum.adVarWChar, 500); } cat.Tables.Append(tbl); //这句把表加入数据库(非常重要) tbl = null; cat = null; cn.Close(); return true; } catch { return false; } } //读取mdb文件内数据表个数 public string[] GetShemaTableName(string mdbPath) { try { //获取数据表 string ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" mdbPath; OleDbConnection conn = new OleDbConnection(ConnectionString); conn.Open(); DataTable shemaTable = conn.GetOleDbSchemaTable (OleDbSchemaGuid.Tables, new object[]{ null, null, null, "TABLE" }); int n = shemaTable.Rows.Count; string[] strTable = new string[n]; int m = shemaTable.Columns.IndexOf("TABLE_NAME"); for (int i = 0; i < n; i ) { DataRow m_DataRow = shemaTable.Rows[i]; strTable[i] = m_DataRow.ItemArray.GetValue(m).ToString(); } return strTable; } catch (OleDbException ex) { MessageBox.Show("指定的限制集无效:\n" ex.Message); return null; } } //读取表内列个数 public string[] GetShemaColName(string mdbPath,string tableName) { try { //获取数据表 string ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" mdbPath; OleDbConnection conn = new OleDbConnection(ConnectionString); conn.Open(); DataTable shemaTable = conn.GetOleDbSchemaTable (OleDbSchemaGuid.Columns, new object[] { null, null, tableName, null }); //foreach (DataRow dr in shemaTable.Rows) //{ // string s=dr["TABLE_NAME"].ToString(); //} //获取表内列数 int n = shemaTable.Rows.Count; string[] strTable = new string[n]; int m = shemaTable.Columns.IndexOf("COLUMN_NAME"); for (int i = 0; i < n; i ) { DataRow m_DataRow = shemaTable.Rows[i]; strTable[i] = m_DataRow.ItemArray.GetValue(m).ToString(); } return strTable; } catch (OleDbException ex) { MessageBox.Show("指定的限制集无效:\n" ex.Message); return null; } } // 读取mdb数据 public static DataTable ReadAllData(string tableName, string mdbPath, ref bool success) { DataTable dt = new DataTable(); try { DataRow dr; //1、建立连接 string strConn = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" mdbPath ";Jet OLEDB:Database Password=haoren"; OleDbConnection odcConnection = new OleDbConnection(strConn); //2、打开连接 odcConnection.Open(); //建立SQL查询 OleDbCommand odCommand = odcConnection.CreateCommand(); //3、输入查询语句 odCommand.CommandText = "select * from " tableName; //建立读取 OleDbDataReader odrReader = odCommand.ExecuteReader(); //查询并显示数据 int size = odrReader.FieldCount; for (int i = 0; i < size; i ) { DataColumn dc; dc = new DataColumn(odrReader.GetName(i)); dt.Columns.Add(dc); } while (odrReader.Read()) { dr = dt.NewRow(); for (int i = 0; i < size; i ) { dr[odrReader.GetName(i)] = odrReader[odrReader.GetName(i)].ToString(); } dt.Rows.Add(dr); } //关闭连接 odrReader.Close(); odcConnection.Close(); success = true; return dt; } catch { success = false; return dt; } } // 读取mdb数据 (按列) public static DataTable ReadDataByColumns(string mdbPath, string tableName, string[] columns, ref bool success) { DataTable dt = new DataTable(); try { DataRow dr; //1、建立连接 string strConn = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" mdbPath ";Jet OLEDB:Database Password=haoren"; OleDbConnection odcConnection = new OleDbConnection(strConn); //2、打开连接 odcConnection.Open(); //建立SQL查询 OleDbCommand odCommand = odcConnection.CreateCommand(); //3、输入查询语句 string strColumn = ""; for (int i = 0; i < columns.Length; i ) { strColumn = columns[i].ToString() ","; } strColumn = strColumn.TrimEnd(','); odCommand.CommandText = "select " strColumn " from " tableName; //建立读取 OleDbDataReader odrReader = odCommand.ExecuteReader(); //查询并显示数据 int size = odrReader.FieldCount; for (int i = 0; i < size; i ) { DataColumn dc; dc = new DataColumn(odrReader.GetName(i)); dt.Columns.Add(dc); } while (odrReader.Read()) { dr = dt.NewRow(); for (int i = 0; i < size; i ) { dr[odrReader.GetName(i)] = odrReader[odrReader.GetName(i)].ToString(); } dt.Rows.Add(dr); } //关闭连接 odrReader.Close(); odcConnection.Close(); success = true; return dt; } catch { success = false; return dt; } } //普通的节点 public struct Node { private string nodeType; public string NodeType//表的字段名 { set { nodeType = value; } get { return nodeType; } } private string nodeValue; public string NodeValue//具体的值 { set { nodeValue = value; } get { return nodeValue; } } } //照片节点 public struct PictureNode { private string nodeType; public string NodeType//照片的列名 { set { nodeType = value; } get { return nodeType; } } private byte[] nodeValue; public byte[] NodeValue//照片的值，注意类型 { set { nodeValue = value; } get { return nodeValue; } } } /* //另外的写法有错误 //插入数据 public static bool InsertRow(string mdbPath, string tableName, ArrayList insertArray, PictureNode pictureNode, ref string errinfo) { try { //1、建立连接 string strConn = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" mdbPath ";Jet OLEDB:Database Password=haoren"; OleDbConnection odcConnection = new OleDbConnection(strConn); //2、打开连接 odcConnection.Open(); string str_col = ""; int size_col = insertArray.Count; for (int i = 0; i < size_col; i ) { Node vipNode = new Node(); vipNode = (Node)insertArray[i]; str_col = vipNode.NodeType ","; } str_col = str_col.TrimEnd(','); int size_row = insertArray.Count; string str_row = ""; for (int i = 0; i < size_row; i ) { Node vipNode = new Node(); vipNode = (Node)insertArray[i]; string v = vipNode.NodeValue.ToString(); v = DealString(v); if (v == "") { str_row = "null" ','; } else { str_row = "'" v "'" ','; } } str_row = str_row.TrimEnd(','); if (pictureNode != null && pictureNode.NodeValue != null) { str_col = ',' pictureNode.NodeType; str_row = ",@Image"; } string sql = "insert into " tableName @" (" str_col ") values" @"(" str_row ")"; OleDbCommand odCommand = new OleDbCommand(sql, odcConnection); if (pictureNode != null && pictureNode.NodeValue != null) { odCommand.Parameters.Add("@Image", OleDbType.VarBinary, pictureNode.NodeValue.Length).Value = pictureNode.NodeValue; } odCommand.ExecuteNonQuery(); odcConnection.Close(); return true; } catch (Exception err) { errinfo = err.Message; return false; } } //更新一行数据 public static bool UpdateRow(string mdbPath, string tableName, Node keyNode, ArrayList insertArray, PictureNode pictureNode, ref string errinfo) { try { //1、建立连接 string strConn = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" mdbPath ";Jet OLEDB:Database Password=haoren"; OleDbConnection odcConnection = new OleDbConnection(strConn); //2、打开连接 odcConnection.Open(); int size = insertArray.Count; string str = ""; for (int i = 0; i < size; i ) { Node node = new Node(); node = (Node)insertArray[i]; string v = node.NodeValue.ToString(); v = DealString(v); str = node.NodeType " = "; if (v == "") { str = "null" ','; } else { str = "'" v "'" ','; } } str = str.TrimEnd(','); if (pictureNode.NodeValue != null) { str = ',' pictureNode.NodeType; str = " = @Image"; } string sql = "update " tableName " set " str " where " keyNode.NodeType " = " "'" keyNode.NodeValue "'"; OleDbCommand odCommand = new OleDbCommand(sql, odcConnection); if (pictureNode.NodeValue != null) { odCommand.Parameters.Add("@Image", OleDbType.VarBinary, pictureNode.NodeValue.Length).Value = pictureNode.NodeValue; } odCommand.ExecuteNonQuery(); odcConnection.Close(); return true; } catch (Exception err) { errinfo = err.Message; return false; } } */ //插入图片数据 public static bool InsertPictureToMDB(string mdbPath, string tableName, Node keyNode,PictureNode pictureNode, ref string errinfo) { try { //1、建立连接 string strConn = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" mdbPath ";Jet OLEDB:Database Password=haoren"; OleDbConnection odcConnection = new OleDbConnection(strConn); //2、打开连接 odcConnection.Open(); string sql = @"update " tableName " set " pictureNode.NodeType "=" "@Image where " keyNode.NodeType "=" "'" keyNode.NodeValue "'"; OleDbCommand comm = new OleDbCommand(sql, odcConnection); byte[] pic = pictureNode.NodeValue; comm.Parameters.Add("@Image", OleDbType.VarBinary, pic.Length).Value = pic; comm.ExecuteNonQuery(); odcConnection.Close(); return true; } catch (Exception err) { errinfo = err.Message; return false; } } //从mdb中获得照片 public static byte[] GetImageFromMDB(string tableName,string pictureCol, Node keyNode) { try { string sql = "Select " pictureCol " From " tableName " member Where " keyNode.NodeType " = " "'" keyNode.NodeValue "'"; string strConn = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" mdbPath ";Jet OLEDB:Database Password=haoren"; OleDbConnection odcConnection = new OleDbConnection(strConn); //2、打开连接 odcConnection.Open(); OleDbCommand comm = new OleDbCommand(sql, odcConnection); OleDbDataReader sdr = comm.ExecuteReader(); sdr.Read(); byte[] pic = (byte[])sdr[0]; sdr.Close(); odcConnection.Close(); return pic; } catch { return null; } } //修改mdb的一条数据 public static bool UpdateMDBNode(string mdbPath, string tableName, Node keyNode, Node saveNode, ref string errinfo) { try { //1、建立连接 string strConn = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" mdbPath ";Jet OLEDB:Database Password=haoren"; OleDbConnection odcConnection = new OleDbConnection(strConn); //2、打开连接 odcConnection.Open(); string sql = @"update " tableName " set " saveNode.NodeType " = '" saveNode.NodeValue "' where " keyNode.NodeType " = " "'" keyNode.NodeValue "'"; OleDbCommand comm = new OleDbCommand(sql, odcConnection); comm.ExecuteNonQuery(); odcConnection.Close(); return true; } catch (Exception err) { errinfo = err.Message; return false; } } //插入数据 public static bool InsertRow(string mdbPath, string tableName, string[] colArray, string[] dataArray, ref string errinfo) { try { //1、建立连接 string strConn = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" mdbPath ";Jet OLEDB:Database Password=haoren"; OleDbConnection odcConnection = new OleDbConnection(strConn); //2、打开连接 odcConnection.Open(); string col=""; string data=""; for (int i = 0; i < colArray.Length; i ) { if (i==colArray.Length-1) { col = col colArray[i]; } else { col = col colArray[i] ","; } } for (int i = 0; i < colArray.Length; i ) { if (i == colArray.Length - 1) { data = data "'" dataArray[i] "'"; } else { data = data "'" dataArray[i] "'" ","; } } string sql = "insert into " tableName " (" col ") values (" data ")"; OleDbCommand comm = new OleDbCommand(sql, odcConnection); comm.ExecuteNonQuery(); odcConnection.Close(); return true; } catch { return false; } } //删除数据 public static bool DeleteData(string mdbPath, string tableName, Node keyNode, ref string errinfo) { try { //1、建立连接 string strConn = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" mdbPath ";Jet OLEDB:Database Password=haoren"; OleDbConnection odcConnection = new OleDbConnection(strConn); //2、打开连接 odcConnection.Open(); string col=keyNode.NodeType; string value=keyNode.NodeValue; string sql = "delete from " tableName " where " col "='" value "'"; //string sql = "delete from " tableName; OleDbCommand comm = new OleDbCommand(sql, odcConnection); comm.ExecuteNonQuery(); odcConnection.Close(); return true; } catch { return false; } } #endregion # region static string mdbPath =""; static string tableName = ""; static string[] strCol=new string[4]; private void button2_Click(object sender, EventArgs e) { //选择创建路径 saveFileDialog1.InitialDirectory = Environment.CurrentDirectory "\\..\\..\\..\\"; saveFileDialog1.ShowDialog(); textBox1.Text = saveFileDialog1.FileName; mdbPath = textBox1.Text; CreateMDBDataBase(mdbPath); } private void button3_Click(object sender, EventArgs e) { tableName = textBox3.Text; int col =Convert .ToInt32( numericUpDown1.Value); ArrayList a = new ArrayList(col); for (int i = 0; i < col; i ) { a.Add(strCol[i]); } CreateMDBTable(mdbPath, tableName, a); } private void button4_Click(object sender, EventArgs e) { tableName = comboBox2.Text; bool bo1=false; DataTable dataTable=new DataTable(); dataTable = ReadAllData(tableName, mdbPath, ref bo1); dataGridView1.DataSource = dataTable; } private void button5_Click(object sender, EventArgs e) { tableName = comboBox2.Text; DataTable dataTable=new DataTable(); bool bo1=false; string[] columns={comboBox1.Text}; dataTable= ReadDataByColumns( mdbPath, tableName, columns, ref bo1); dataGridView1.DataSource = dataTable; } private void button6_Click(object sender, EventArgs e) { string bol = ""; Node a=new Node(); Node b = new Node(); a.NodeType=textBox8.Text; a.NodeValue=textBox9.Text; b.NodeType = textBox8.Text; b.NodeValue=textBox10.Text; UpdateMDBNode(mdbPath, tableName, a, b, ref bol); } private void button7_Click(object sender, EventArgs e) { string bol = ""; string[] colArray = GetShemaColName(mdbPath, tableName); string[] dataArray = { textBox5.Text, textBox6.Text, textBox7.Text }; InsertRow(mdbPath, tableName, colArray,dataArray, ref bol); } private void button9_Click(object sender, EventArgs e) { string bol = ""; Node a = new Node(); a.NodeType = textBox11.Text; a.NodeValue = textBox12.Text; DeleteData (mdbPath, tableName, a, ref bol); } private void button1_Click(object sender, EventArgs e) { openFileDialog1.InitialDirectory = Environment.CurrentDirectory "\\..\\..\\..\\"; openFileDialog1.ShowDialog(); textBox1.Text = openFileDialog1.FileName; mdbPath = textBox1.Text; string[] strA = GetShemaTableName(mdbPath); textBox2.Text = strA.Length.ToString(); for (int i = 0; i < strA.Length; i ) { comboBox2.Items.Add(strA[i ]); } } private void textBox4_Leave(object sender, EventArgs e) { int col = Convert.ToInt32(numericUpDown2.Value); strCol[col] = textBox4.Text; } private void comboBox1_Enter(object sender, EventArgs e) { if (comboBox1.Text=="") { //MessageBox.Show(""); string[] strA = GetShemaColName(mdbPath, tableName); for (int i = 0; i < strA.Length; i ) { comboBox1.Items.Add(strA[i]); } } } private void comboBox2_Leave(object sender, EventArgs e) { tableName = comboBox2.Text; } #endregion private void button8_Click(object sender, EventArgs e) { Node keyNode = new Node(); PictureNode pictureNode = new PictureNode(); string errinfo = ""; FileStream myStream = new FileStream(openPicture.FileName, FileMode.Open, FileAccess.Read); byte[] imagebytes = new byte[myStream.Length];//fs.Length文件流的长度，用字节表示 BinaryReader br = new BinaryReader(myStream);//二进制文件读取器 imagebytes = br.ReadBytes(Convert.ToInt32(myStream.Length));//从当前流中将count个字节读入字节数组中 myStream.Close(); keyNode.NodeType = textBox15.Text; keyNode.NodeValue = textBox16.Text; pictureNode.NodeType = textBox13.Text; pictureNode.NodeValue = imagebytes; InsertPictureToMDB(mdbPath, tableName, keyNode, pictureNode,ref errinfo); } OpenFileDialog openPicture = new OpenFileDialog(); private void textBox14_Enter(object sender, EventArgs e) { openPicture.Filter = "Image Files(*.BMP;*.JPG;*.GIF)|*.BMP;*.JPG;*.GIF|All files (*.*)|*.* "; openPicture.ShowDialog(); textBox14.Text = openPicture.FileName; //openPicture.OpenFile(); } private void button10_Click(object sender, EventArgs e) { Node keyNode = new Node(); keyNode.NodeType = textBox15.Text; keyNode.NodeValue = textBox16.Text; string pictureCol = textBox13.Text; byte[] pictureByt= GetImageFromMDB(tableName, pictureCol, keyNode); MemoryStream stream = new MemoryStream(pictureByt, true); stream.Write(pictureByt, 0, pictureByt.Length); pictureBox1.Image = new Bitmap(stream); stream.Close(); } } } |
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