用于JDBC操作数据库的公共类
1 /* 2 * @(#)CommonSql.java 2011-9-5 3 * 4 * Copyright 2011 Bianjing,All rights reserved. 5 */ 6 7 import java.sql.Connection; 8 import java.sql.DatabaseMetaData; 9 import java.sql.DriverManager; 10 import java.sql.PreparedStatement; 11 import java.sql.ResultSet; 12 import java.sql.SQLException; 13 import java.sql.Statement; 14 import java.util.List; 15 16 import javax.naming.Context; 17 import javax.naming.InitialContext; 18 import javax.sql.DataSource; 19 20 /** 21 * 用于JDBC操作数据库的共通类 22 * 23 * @author Bianjing 24 * @version 1.0.0 2011-9-5 25 */ 26 public class CommonSql { 27 /** 数据源 */ 28 private DataSource dataSource; 29 30 /** 数据库连接对象 */ 31 private Connection connection; 32 33 /** 数据库操作对象 */ 34 private PreparedStatement ps; 35 36 /** 数据库操作对象 */ 37 private Statement statement; 38 39 /** 返回的数据结果集对象 */ 40 private ResultSet rs; 41 42 /** 是否自动提交事务,默认为true,如果该值为false则需要手动提交事务 */ 43 private boolean autoCommit = true; 44 45 /** 数据库连接是否已经打开 */ 46 private boolean openConnection; 47 48 /** JNDI名称 */ 49 private String jndiName; 50 51 /** 数据库驱动 */ 52 private String driver; 53 54 /** 数据库访问地址 */ 55 private String url; 56 57 /** 用户名 */ 58 private String user; 59 60 /** 密码 */ 61 private String pwd; 62 63 public CommonSql() { 64 65 } 66 67 public CommonSql(DataSource dataSource) { 68 this.dataSource = dataSource; 69 } 70 71 public CommonSql(String jndiName) { 72 this.jndiName = jndiName; 73 } 74 75 public CommonSql(String driver, String url, String user, String pwd) { 76 this.driver = driver; 77 this.url = url; 78 this.user = user; 79 this.pwd = pwd; 80 } 81 82 /** 83 * 打开数据库连接并创建数据库连接对象<br/> 84 * 支持通过ICO注入数据源、数据库驱动、数据库驱动、JNDI名称、数据库访问地址和用户名、密码 85 * 86 * @return boolean true:连接成功,false:连接失败 87 */ 88 public boolean openConnection() { 89 /** 90 * 通过数据源来获取数据库连接对象 91 */ 92 if (dataSource != null) { 93 try { 94 connection = dataSource.getConnection(); 95 // 数据库连接已经打开 96 openConnection = true; 97 } catch (SQLException e) { 98 closeAll(); 99 // 所有的"System.out.println"都可以替换为"logger.error" 100 System.out.println("从数据源获取数据库连接失败!"); 101 throw new RuntimeException(e); 102 } 103 104 return openConnection; 105 } 106 /** 107 * 通过JNDI来获取数据库连接对象 108 */ 109 if (jndiName != null) { 110 try { 111 Context initContext = new InitialContext(); 112 dataSource = (DataSource) initContext.lookup(jndiName); 113 connection = dataSource.getConnection(); 114 // 数据库连接已经打开 115 openConnection = true; 116 } catch (Exception e) { 117 closeAll(); 118 System.out.println("从JNDI获取数据库连接失败!"); 119 throw new RuntimeException(e); 120 } 121 122 return openConnection; 123 } 124 /** 125 * 通过数据库驱动、数据库访问地址、用户名、密码来获取数据库连接对象 126 */ 127 try { 128 Class.forName(driver); 129 connection = DriverManager.getConnection(url, user, pwd); 130 // 数据库连接已经打开 131 openConnection = true; 132 } catch (Exception e) { 133 closeAll(); 134 System.out.println("数据库连接失败!"); 135 throw new RuntimeException(e); 136 } 137 138 return openConnection; 139 } 140 141 /** 142 * 执行数据库的更新操作 143 * 144 * @param sql 145 * 要执行的SQL语句 146 * @return boolean true:执行成功,false:执行失败 147 */ 148 public boolean execUpdate(String sql, Object... args) { 149 boolean isPassed = false; 150 // 判断连接数据库是否成功 151 if (openConnection) { 152 try { 153 ps = connection.prepareStatement(sql); 154 // 设置参数 155 if (args != null && args.length > 0) { 156 for (int i = 0; i < args.length; i++) { 157 ps.setObject(i + 1, args[i]); 158 } 159 } 160 ps.executeUpdate(); 161 162 isPassed = true; 163 } catch (SQLException e) { 164 try { 165 if (autoCommit) { 166 connection.rollback(); 167 } 168 } catch (SQLException e1) { 169 throw new RuntimeException(e1); 170 } 171 System.out.println("SQL:" + sql); 172 throw new RuntimeException(e); 173 } finally { 174 if (autoCommit) { 175 closeAll(); 176 } 177 } 178 } else { 179 System.out.println("数据库连接对象没有打开!"); 180 } 181 182 return isPassed; 183 } 184 185 /** 186 * 执行数据库的更新操作 187 * 188 * @param sql 189 * 要执行的SQL语句 190 * @return boolean true:执行成功,false:执行失败 191 */ 192 public boolean execUpdate(String sql, List<?> args) { 193 return execUpdate(sql, args.toArray()); 194 } 195 196 /** 197 * 执行批量更新数据库操作 198 * 199 * @param sql 200 * 要执行的SQL语句的字符串数组 201 * @return boolean true:执行成功,false:执行失败 202 */ 203 public boolean execUpdate(Object[] sql) { 204 boolean flag = false; 205 // 判断连接数据库是否成功 206 if (openConnection) { 207 try { 208 statement = connection.createStatement(); 209 for (int i = 0; i < sql.length; i++) { 210 statement.addBatch((String) sql[i]); 211 } 212 statement.executeBatch(); 213 214 flag = true; 215 } catch (SQLException e) { 216 try { 217 if (autoCommit) { 218 connection.rollback(); 219 } 220 } catch (SQLException e1) { 221 throw new RuntimeException(e1); 222 } 223 for (int i = 0; i < sql.length; i++) { 224 System.out.println("SQL " + (i + 1) + ":" + sql[i]); 225 } 226 throw new RuntimeException(e); 227 } finally { 228 if (autoCommit) { 229 closeAll(); 230 } 231 } 232 } else { 233 System.out.println("数据库连接对象没有打开!"); 234 } 235 236 return flag; 237 } 238 239 /** 240 * 执行批量更新数据库操作 241 * 242 * @param sql 243 * 要执行的SQL语句的集合 244 * @return boolean true:执行成功,false:执行失败 245 */ 246 public boolean execUpdate(List<?> sql) { 247 return execUpdate(sql.toArray()); 248 } 249 250 /** 251 * 执行数据库查询操作 252 * 253 * @param sql 254 * 要执行的SQL语句 255 * @param args 256 * 查询参数列表 257 * @return ResultSet 返回查询的结果集对象 258 */ 259 public ResultSet execQuery(String sql, Object... args) { 260 rs = null; 261 // 判断连接数据库是否成功 262 if (openConnection) { 263 try { 264 ps = connection.prepareStatement(sql); 265 // 设置参数 266 if (args != null && args.length > 0) { 267 for (int i = 0; i < args.length; i++) { 268 ps.setObject(i + 1, args[i]); 269 } 270 } 271 272 rs = ps.executeQuery(); 273 } catch (SQLException e) { 274 if (autoCommit) { 275 closeAll(); 276 } 277 System.out.println("SQL:" + sql); 278 throw new RuntimeException(e); 279 } 280 } else { 281 System.out.println("数据库连接对象没有打开!"); 282 } 283 284 return rs; 285 } 286 287 /** 288 * 执行数据库查询操作 289 * 290 * @param sql 291 * 要执行的SQL语句 292 * @param args 293 * 查询参数列表 294 * @return ResultSet 返回查询的结果集对象 295 */ 296 public ResultSet execQuery(String sql, List<?> args) { 297 return execQuery(sql, args.toArray()); 298 } 299 300 /** 301 * 根据标准SQL查询数据库,返回一个int值 302 * 303 * @param sql 304 * 要执行的SQL语句 305 * @param args 306 * 查询参数列表 307 * @return int值,如果出错则返回-1 308 */ 309 public int findForInt(String sql, Object... args) { 310 ResultSet rs = execQuery(sql, args); 311 int count = -1; 312 try { 313 if (rs != null && rs.next()) { 314 count = rs.getInt(1); 315 } 316 } catch (SQLException e) { 317 throw new RuntimeException(e); 318 } finally { 319 if (autoCommit) { 320 closeAll(); 321 } 322 } 323 324 return count; 325 } 326 327 /** 328 * 根据标准SQL查询数据库,返回一个int值 329 * 330 * @param sql 331 * 要执行的SQL语句 332 * @param args 333 * 查询参数列表 334 * @return int值,如果出错则返回-1 335 */ 336 public int findForInt(String sql, List<?> args) { 337 return findForInt(sql, args.toArray()); 338 } 339 340 /** 341 * 关闭所有数据库连接对象 342 */ 343 public void closeAll() { 344 if (rs != null || ps != null || statement != null || connection != null) { 345 try { 346 if (rs != null) { 347 rs.close(); 348 } 349 } catch (SQLException e) { 350 throw new RuntimeException(e); 351 } finally { 352 rs = null; 353 if (ps != null || statement != null || connection != null) { 354 try { 355 if (ps != null && !ps.isClosed()) { 356 ps.close(); 357 } 358 } catch (SQLException e) { 359 throw new RuntimeException(e); 360 } finally { 361 ps = null; 362 if (statement != null || connection != null) { 363 try { 364 if (statement != null && !statement.isClosed()) { 365 statement.close(); 366 } 367 } catch (SQLException e) { 368 throw new RuntimeException(e); 369 } finally { 370 statement = null; 371 try { 372 if (connection != null 373 && !connection.isClosed()) { 374 connection.close(); 375 } 376 } catch (SQLException e) { 377 throw new RuntimeException(e); 378 } finally { 379 connection = null; 380 } 381 } 382 } 383 } 384 } 385 } 386 } 387 } 388 389 /** 390 * 提交事务并关闭数据库连接 391 */ 392 public void commit() { 393 try { 394 if (!autoCommit) { 395 connection.commit(); 396 } 397 } catch (SQLException e) { 398 throw new RuntimeException(e); 399 } finally { 400 autoCommit = true; 401 closeAll(); 402 } 403 } 404 405 /** 406 * 回滚事务并关闭数据库连接 407 */ 408 public void rollback() { 409 try { 410 if (!autoCommit) { 411 connection.rollback(); 412 } 413 } catch (SQLException e) { 414 throw new RuntimeException(e); 415 } finally { 416 autoCommit = true; 417 closeAll(); 418 } 419 } 420 421 public DataSource getDataSource() { 422 return dataSource; 423 } 424 425 public void setDataSource(DataSource dataSource) { 426 this.dataSource = dataSource; 427 } 428 429 public String getDriver() { 430 return driver; 431 } 432 433 public void setDriver(String driver) { 434 this.driver = driver; 435 } 436 437 public String getUrl() { 438 return url; 439 } 440 441 public void setUrl(String url) { 442 this.url = url; 443 } 444 445 public boolean getAutoCommit() { 446 return autoCommit; 447 } 448 449 public void setAutoCommit(boolean autoCommit) { 450 try { 451 connection.setAutoCommit(autoCommit); 452 } catch (SQLException e) { 453 closeAll(); 454 throw new RuntimeException(e); 455 } 456 this.autoCommit = autoCommit; 457 } 458 459 public boolean getOpenConnection() { 460 return openConnection; 461 } 462 463 public String getJndiName() { 464 return jndiName; 465 } 466 467 public void setJndiName(String jndiName) { 468 this.jndiName = jndiName; 469 } 470 471 public String getUser() { 472 return user; 473 } 474 475 public void setUser(String user) { 476 this.user = user; 477 } 478 479 public String getPwd() { 480 return pwd; 481 } 482 483 public void setPwd(String pwd) { 484 this.pwd = pwd; 485 } 486 487 public Connection getConnection() { 488 return connection; 489 } 490 491 /** 492 * 测试数据库连接是否成功 493 * 494 * @param args 495 * @throws SQLException 496 */ 497 public static void main(String[] args) throws SQLException { 498 String driver = "com.microsoft.sqlserver.jdbc.SQLServerDriver"; 499 String url = "jdbc:sqlserver://127.0.0.1:1433;databaseName=demo"; 500 String user = "sa"; 501 String pwd = "sa"; 502 503 CommonSql commonSql = new CommonSql(driver, url, user, pwd); 504 if (commonSql.openConnection()) { 505 System.out.println("数据库连接成功!"); 506 DatabaseMetaData dbMetaData = commonSql.getConnection() 507 .getMetaData(); 508 System.out 509 .print("当前连接的数据库是:" + dbMetaData.getDatabaseProductName()); 510 System.out.println(" " + dbMetaData.getDatabaseProductVersion()); 511 } else { 512 System.out.println("数据库连接失败!"); 513 } 514 515 commonSql.closeAll(); 516 } 517 }