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SqlHelper这名称代表一个库，用于访问数据库的简单封装。比如一个完整的数据库查询过程：首先创建链接，然后判断链接是否有效，然后创建查询参数列表，然后调用查询语句，然后处理数据，最后关闭链接。说起来就感觉这东西有点复杂，一般有经验的程序猿都从方便自身角度对SqlHelper进行一定程度的封装，简化对数据库的调用。每个玩过数据库的程序猿都有一个，我的长这样：
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 | using System; using System.Text; using System.Configuration; using System.Data; using System.Data.SqlClient; namespace SqlHelper { public class sqlHelper { //管道连接字符串 private static string strCon = ConfigurationManager.AppSettings["sqlstr"]; //默认每页条数 public const int defPageRow = 40; /// <summary> /// 获取Sql管道连接句柄 /// </summary> /// <returns>Sql连接句柄</returns> private static SqlConnection GetConn () { SqlConnection conn = new SqlConnection (strCon); conn.Open (); return conn; } /// <summary> /// 关闭Sql管道连接 /// </summary> /// <param name="conn">管道连接句柄</param> private static void Close (SqlConnection conn) { try { if (conn == null) return; if (conn.State == ConnectionState.Open) conn.Close (); conn.Dispose (); } catch (Exception) { } } /// <summary> /// 获取参数 /// </summary> /// <param name="oc"></param> /// <returns></returns> public static SqlParameter[] GetParameter (params object[] oc) { if (oc == null || oc.Length == 0) { return null; } else if (oc.Length % 2 > 0) { throw new Exception ("参数个数不可为奇数！"); } int count = oc.Length / 2; SqlParameter[] spc = new SqlParameter[count]; for (int i = 0; i < count; i++) { if (oc[i * 2].ToString ()[0] != '@') throw new Exception ("参数名命名规则错误！"); spc[i] = new SqlParameter (); spc[i].ParameterName = oc[i * 2].ToString (); spc[i].Value = oc[i * 2 + 1]; } return spc; } /// <summary> /// 拷贝数据库参数 /// </summary> /// <param name="spc">数据库参数</param> /// <returns>数据库参数</returns> private static SqlParameter[] GetNewSqlParameterCollection (SqlParameter[] spc) { if (spc == null) return null; SqlParameter[] ret = new SqlParameter[spc.Length]; for (int i = 0; i < spc.Length; i++) { ret[i] = new SqlParameter (); ret[i].ParameterName = spc[i].ParameterName; ret[i].Value = spc[i].Value; } return ret; } /// <summary> /// ExecuteNonQuery你懂得 /// </summary> /// <param name="sqlstr">数据库语句</param> /// <param name="spc">数据库参数</param> /// <returns>受影响行数</returns> public static int ExecuteNonQuery (string sqlstr, SqlParameter[] spc) { SqlConnection conn = GetConn (); SqlCommand cmd = new SqlCommand (sqlstr, conn); SqlParameter[] spc2 = GetNewSqlParameterCollection (spc); if (spc2 != null) cmd.Parameters.AddRange (spc2); int ret = cmd.ExecuteNonQuery (); Close (conn); return ret; } /// <summary> /// ExecuteNonQuery你懂得 /// </summary> /// <param name="sqlstr">数据库语句</param> /// <param name="oc">字符串参数数组</param> /// <returns>受影响行数</returns> public static int ExecuteNonQuery (string sqlstr, params object[] oc) { return ExecuteNonQuery (sqlstr, GetParameter (oc)); } /// <summary> /// ExecuteScalary你懂得 /// </summary> /// <param name="sqlstr">数据库语句</param> /// <param name="spc">数据库参数</param> /// <returns>返回的结果</returns> public static object ExecuteScalary (string sqlstr, SqlParameter[] spc) { SqlConnection conn = GetConn (); SqlCommand cmd = new SqlCommand (sqlstr, conn); SqlParameter[] spc2 = GetNewSqlParameterCollection (spc); if (spc2 != null) cmd.Parameters.AddRange (spc2); object ret = cmd.ExecuteScalar (); Close (conn); return ret; } /// <summary> /// ExecuteScalary你懂得 /// </summary> /// <param name="sqlstr">数据库语句</param> /// <param name="oc">字符串参数数组</param> /// <returns>返回的结果</returns> public static object ExecuteScalary (string sqlstr, params object[] oc) { return ExecuteScalary (sqlstr, GetParameter (oc)); } /// <summary> /// ExecuteDataTable你懂得 /// </summary> /// <param name="sqlstr">数据库语句</param> /// <param name="spc">数据库参数</param> /// <returns>返回的表格</returns> public static DataTable ExecuteDataTable (string sqlstr, SqlParameter[] spc) { SqlConnection conn = GetConn (); SqlCommand cmd = new SqlCommand (sqlstr, conn); SqlParameter[] spc2 = GetNewSqlParameterCollection (spc); if (spc2 != null) cmd.Parameters.AddRange (spc2); DataSet ds = new DataSet (); SqlDataAdapter sda = new SqlDataAdapter (cmd); sda.Fill (ds); DataTable ret = ds.Tables[0]; Close (conn); return ret; } /// <summary> /// ExecuteDataTable你懂得 /// </summary> /// <param name="sqlstr">数据库语句</param> /// <param name="oc">字符串参数数组</param> /// <returns>返回的表格</returns> public static DataTable ExecuteDataTable (string sqlstr, object[] oc) { return ExecuteDataTable (sqlstr, GetParameter (oc)); } /// <summary> /// ExecuteDataSet你懂得 /// </summary> /// <param name="sqlstr"></param> /// <param name="spc"></param> /// <returns></returns> public static DataSet ExecuteDataSet (string sqlstr, SqlParameter[] spc) { DataSet ds = new DataSet (); SqlConnection conn = GetConn (); SqlCommand cmd = new SqlCommand (sqlstr, conn); SqlParameter[] spc2 = GetNewSqlParameterCollection (spc); if (spc2 != null) cmd.Parameters.AddRange (spc2); SqlDataAdapter sda = new SqlDataAdapter (cmd); sda.Fill (ds); Close (conn); return ds; } /// <summary> /// ExecuteDataSet你懂得 /// </summary> /// <param name="sqlstr">数据库语句</param> /// <param name="oc">字符串参数数组</param> /// <returns>返回的表格</returns> public static DataSet ExecuteDataSet (string sqlstr, object[] oc) { return ExecuteDataSet (sqlstr, GetParameter (oc)); } /// <summary> /// 获取某表行数 /// </summary> /// <param name="table">表名（可附加条件）</param> /// <param name="spc">参数</param> /// <returns>行数</returns> public static int GetCount (string table, SqlParameter[] spc = null) { return sqlHelper2.ExecuteScalary (string.Format ("select count(*) from {0}", table), spc).toInt32 (); } /// <summary> /// 获取多张表函数总和 /// </summary> /// <param name="spc">参数</param> /// <param name="table">表名（可附加条件）</param> /// <returns>行数</returns> public static int GetCountTotal (SqlParameter[] spc, params string[] table) { return sqlHelper2.ExecuteScalary(string.Format("select (select count(*) from {0})", table.join(") + (select count(*) from ")), spc).toInt32(); } /// <summary> /// 获取某表查询时的页数 /// </summary> /// <param name="table">表名</param> /// <param name="pageRow">每页行数</param> /// <returns></returns> public static int GetPageCount (string table, SqlParameter[] spc = null, int pageRow = sqlHelper2.defPageRow) { try { int count = GetCount (table, spc); return count / pageRow + (count % pageRow > 0 ? 1 : 0); } catch (Exception) { return 1; } } /// <summary> /// 检查页码是否正确 /// </summary> /// <param name="page">页码</param> /// <param name="count">每页条数</param> /// <returns>正确的页码</returns> public static int CheckPage (int page, int count) { if (page < 1) return 1; else if (page > count) return count; else return page; } /// <summary> /// 获取新ID /// </summary> /// <returns></returns> public static string GetNewID () { //return sqlHelper2.ExecuteScalary ("select newid()", null).ToString (); return Guid.NewGuid ().toString (); } /// <summary> /// 获取某列表 /// </summary> /// <param name="sqlstr">数据库语句</param> /// <param name="spc">数据库参数</param> /// <returns>列表数组</returns> public static string[] sGlobalGetList (string sqlstr, SqlParameter[] spc) { DataTable dt = sqlHelper2.ExecuteDataTable (sqlstr, spc); if (dt.Rows.Count == 0) return null; string[] sc = new string[dt.Rows.Count]; StringBuilder sb; for (int i = 0; i < dt.Rows.Count; i++) { sb = new StringBuilder (); for (int j = 0; j < dt.Columns.Count; j++) { if (j != 0) sb.Append ("#"); //sb.Append(dt.Rows[i][j].ToString()); try { if (dt.Columns[j].DataType.ToString ().Trim () == "DateTime") { sb.Append (Convert.ToDateTime (dt.Rows[i][j]).ToString ("yyyy-MM-dd")); } else { sb.Append (dt.Rows[i][j].ToString ().Trim ()); } } catch (Exception) { } } sc[i] = sb.ToString (); } return sc; } /// <summary> /// 获取某列表 /// </summary> /// <param name="sqlstr">数据库语句</param> /// <param name="oc">字符串参数数组</param> /// <returns>列表数组</returns> public static string[] sGlobalGetList (string sqlstr, params object[] oc) { return sGlobalGetList (sqlstr, GetParameter (oc)); } /// <summary> /// 获取某列表（完整时间） /// </summary> /// <param name="sqlstr">数据库语句</param> /// <param name="spc">数据库参数</param> /// <returns>列表数组</returns> public static string[] sGlobalGetListLongTime (string sqlstr, SqlParameter[] spc) { DataTable dt = sqlHelper2.ExecuteDataTable (sqlstr, spc); if (dt.Rows.Count == 0) return null; string[] sc = new string[dt.Rows.Count]; StringBuilder sb; for (int i = 0; i < dt.Rows.Count; i++) { sb = new StringBuilder (); for (int j = 0; j < dt.Columns.Count; j++) { if (j != 0) sb.Append ("#"); //sb.Append(dt.Rows[i][j].ToString()); try { if (dt.Columns[j].DataType.ToString ().Trim () == "DateTime") { sb.Append (Convert.ToDateTime (dt.Rows[i][j]).ToString ("yyyy-MM-dd HH:mm")); } else { sb.Append (dt.Rows[i][j].ToString ().Trim ()); } } catch (Exception) { } } sc[i] = sb.ToString (); } return sc; } /// <summary> /// 获取某列表（完整时间） /// </summary> /// <param name="sqlstr">数据库语句</param> /// <param name="spc">数据库参数</param> /// <returns>列表数组</returns> public static string[] sGlobalGetListLongTime (string sqlstr, params object[] oc) { return sGlobalGetListLongTime (sqlstr, GetParameter (oc)); } /// <summary> /// 获取某行数据 /// </summary> /// <param name="sqlstr">数据库语句</param> /// <param name="spc">数据库参数</param> /// <returns>行数组</returns> public static string[] sGlobalGetLine (string sqlstr, SqlParameter[] spc) { DataTable dt = sqlHelper2.ExecuteDataTable (sqlstr, spc); if (dt.Rows.Count == 0) return null; string[] sc = new string[dt.Columns.Count]; for (int i = 0; i < dt.Columns.Count; i++) { try { if (dt.Columns[i].DataType.ToString ().IndexOf ("DateTime") >= 0) { sc[i] = dt.Rows[0][i].toDateTime ().formatDate (); } else { sc[i] = dt.Rows[0][i].toString (); } } catch (Exception) { sc[i] = ""; } } return sc; } /// <summary> /// 获取某行数据 /// </summary> /// <param name="sqlstr">数据库语句</param> /// <param name="spc">数据库参数</param> /// <returns>行数组</returns> public static string[] sGlobalGetLine (string sqlstr, params object[] oc) { return sGlobalGetLine (sqlstr, GetParameter (oc)); } /// <summary> /// 获取某行数据（完整时间） /// </summary> /// <param name="sqlstr">数据库语句</param> /// <param name="spc">数据库参数</param> /// <returns>行数组</returns> public static string[] sGlobalGetLineLongTime (string sqlstr, SqlParameter[] spc) { DataTable dt = sqlHelper2.ExecuteDataTable (sqlstr, spc); if (dt.Rows.Count == 0) return null; string[] sc = new string[dt.Columns.Count]; for (int i = 0; i < dt.Columns.Count; i++) { try { if (dt.Columns[i].DataType.ToString ().IndexOf ("DateTime") >= 0) { sc[i] = dt.Rows[0][i].toDateTime ().formatDateTime (); } else { sc[i] = dt.Rows[0][i].toString (); } } catch (Exception) { sc[i] = ""; } } return sc; } /// <summary> /// 获取某行数据（完整时间） /// </summary> /// <param name="sqlstr">数据库语句</param> /// <param name="spc">数据库参数</param> /// <returns>行数组</returns> public static string[] sGlobalGetLineLongTime (string sqlstr, params object[] oc) { return sGlobalGetLineLongTime (sqlstr, GetParameter (oc)); } /// <summary> /// 获取完整某表 /// </summary> /// <param name="sqlstr">数据库语句</param> /// <param name="spc">数据库参数</param> /// <returns>二维列表数组</returns> public static string[][] mGlobalGetList (string sqlstr, SqlParameter[] spc) { DataTable dt = sqlHelper2.ExecuteDataTable (sqlstr, spc); string[][] s = new string[dt.Rows.Count][]; for (int i = 0; i < dt.Rows.Count; i++) { s[i] = new string[dt.Columns.Count]; for (int j = 0; j < dt.Columns.Count; j++) { string t = dt.Columns[j].DataType.ToString ().Trim (); if (t.IndexOf ('.') >= 0) { t = t.Substring (t.LastIndexOf ('.') + 1); } try { if (t == "DateTime") { s[i][j] = Convert.ToDateTime (dt.Rows[i][j]).ToString ("yyyy-MM-dd"); } else { s[i][j] = dt.Rows[i][j].ToString ().Trim (); } } catch (Exception) { s[i][j] = ""; } } } return s; } /// <summary> /// 获取完整某表 /// </summary> /// <param name="sqlstr">数据库语句</param> /// <param name="spc">数据库参数</param> /// <returns>二维列表数组</returns> public static string[][] mGlobalGetList (string sqlstr, params object[] oc) { return mGlobalGetList (sqlstr, GetParameter (oc)); } /// <summary> /// 获取完整某表（完整时间） /// </summary> /// <param name="sqlstr">数据库语句</param> /// <param name="spc">数据库参数</param> /// <returns>二维列表数组</returns> public static string[][] mGlobalGetListLongTime (string sqlstr, SqlParameter[] spc) { DataTable dt = sqlHelper2.ExecuteDataTable (sqlstr, spc); string[][] s = new string[dt.Rows.Count][]; for (int i = 0; i < dt.Rows.Count; i++) { s[i] = new string[dt.Columns.Count]; for (int j = 0; j < dt.Columns.Count; j++) { string t = dt.Columns[j].DataType.ToString ().Trim (); if (t.IndexOf ('.') >= 0) { t = t.Substring (t.LastIndexOf ('.') + 1); } try { if (t == "DateTime") { s[i][j] = Convert.ToDateTime (dt.Rows[i][j]).formatDateTime (); } else { s[i][j] = dt.Rows[i][j].ToString ().Trim (); } } catch (Exception) { s[i][j] = ""; } } } return s; } /// <summary> /// 获取完整某表（完整时间） /// </summary> /// <param name="sqlstr">数据库语句</param> /// <param name="oc">字符串参数数组</param> /// <returns>二维列表数组</returns> public static string[][] mGlobalGetListLongTime (string sqlstr, params object[] oc) { return mGlobalGetListLongTime (sqlstr, GetParameter (oc)); } } } |
注：使用方法不细说，这东西还有个好处是可以直接通过Sql语句来访问Excel表格，具体方法为，改引用 System.Data.SqlClient 为 System.Data.OleDb，然后会提示一堆错，找不到类型之类的，全局替换错误的名称，比如 SqlConnection 全局替换为 OleDbConnection等等，替换完成后传入的链接字符串格式为：
Provider=Microsoft.Jet.OLEDB.4.0;Extended Properties=Excel 8.0;data source=D:/a.xls |
然后就可以通过数据库语句来访问Excel了。
