cassandra 數據到Java對象的映射綁定。本站提示廣大學習愛好者：（cassandra 數據到Java對象的映射綁定）文章只能為提供參考，不一定能成為您想要的結果。以下是cassandra 數據到Java對象的映射綁定正文
類似Hibernate和MyBatis的關系映射，自動幫你將查詢數據或是修改的參數進行數據映射和綁定。
支持查詢後返回數據ResultSet到Java對象的映射，支持修改、刪除、查詢之前參數的綁定。
在JavaEntity的命名方式不合規范情況下，可以用Map進行綁定映射。
這種做法可以適用於JDBC的sql result到Java Entity的映射綁定，但需要修改少量的代碼。
代碼如下：
1 package com.cnblogs.hoojo.cassar.utils; 2 3 import java.beans.PropertyDescriptor; 4 import java.lang.reflect.InvocationTargetException; 5 import java.math.BigDecimal; 6 import java.math.BigInteger; 7 import java.net.InetAddress; 8 import java.sql.Timestamp; 9 import java.util.Date; 10 import java.util.HashMap; 11 import java.util.Iterator; 12 import java.util.List; 13 import java.util.Map; 14 import java.util.Set; 15 import java.util.UUID; 16 17 import org.apache.commons.beanutils.PropertyUtils; 18 import org.apache.commons.collections.MapUtils; 19 import org.apache.commons.lang3.StringUtils; 20 import org.slf4j.Logger; 21 import org.slf4j.LoggerFactory; 22 import org.springframework.beans.BeanUtils; 23 24 import com.datastax.driver.core.BoundStatement; 25 import com.datastax.driver.core.ColumnDefinitions; 26 import com.datastax.driver.core.ColumnDefinitions.Definition; 27 import com.datastax.driver.core.DataType; 28 import com.datastax.driver.core.PreparedStatement; 29 import com.datastax.driver.core.Row; 30 import com.google.common.collect.Maps; 31 32 /** 33 * <b>function:</b> cassandra 到 JavaEntity 映射轉換 34 * @author hoojo 35 * @createDate 2017-1-19 下午6:20:47 36 * @file RowMapperUtils.java 37 * @package com.cnblogs.hoojo.cassar.utils 38 * @blog http://blog.csdn.net/IBM_hoojo 39 * @email [email protected] 40 * @version 1.0 41 */ 42 public class RowMapperUtils { 43 44 private static final Logger logger = LoggerFactory.getLogger(RowMapperUtils.class); 45 46 public static boolean DEBUG = false; 47 public static String LOG_LEVEL = "TRACE"; 48 49 /** 50 * <b>function:</b> 將查詢的Row轉換到target 對象中返回 51 * @author hoojo 52 * @createDate 2017-1-20 下午5:36:20 53 * @param target 返回Java對象 54 * @param row {@link Row} 55 * @return 返回Java對象 56 */ 57 public static <T> T conversion(T target, Row row) { 58 return conversion(target, row, null); 59 } 60 61 /** 62 * <b>function:</b> 將查詢的Row轉換到target 對象中返回，row對象存在List、Set集合類型情況 63 * @author hoojo 64 * @createDate 2017-1-20 下午5:36:20 65 * @param target 返回Java對象 66 * @param row {@link Row} 67 * @param genericClass List中存儲值 的class類型 68 * @return 返回Java對象 69 */ 70 public static <T> T conversion(T target, Row row, Map<String, Class<?>> genericClass) { 71 return conversion(target, row, genericClass, null); 72 } 73 74 /** 75 * <b>function:</b> 將查詢的Row轉換到target 對象中返回，row對象存在List、Set、Map集合類型情況 76 * @author hoojo 77 * @createDate 2017-1-20 下午5:36:20 78 * @param target 返回Java對象 79 * @param row {@link Row} 80 * @param valClass List中存儲值 的class類型 81 * @param keyClass List中存儲Key 的class類型 82 * @return 返回Java對象 83 */ 84 @SuppressWarnings("unchecked") 85 public static <T> T conversion(T target, Row row, Map<String, Class<?>> valClass, Map<String, Class<?>> keyClass) { 86 Class<T> clazz = (Class<T>) target.getClass(); 87 return conversion(clazz, row, valClass, keyClass); 88 } 89 90 /** 91 * <b>function:</b> 將查詢的Row轉換到clazz實例對象返回，row對象存在List、Set集合類型情況 92 * @author hoojo 93 * @createDate 2017-1-20 下午5:36:20 94 * @param target 返回Java對象 95 * @param row {@link Row} 96 * @return 返回Java對象 97 */ 98 public static <T> T conversion(Class<T> clazz, Row row) { 99 return conversion(clazz, row, null); 100 } 101 102 /** 103 * <b>function:</b> 將查詢的Row轉換到clazz實例對象返回，row對象存在List、Set集合類型情況 104 * @author hoojo 105 * @createDate 2017-1-20 下午5:36:20 106 * @param target 返回Java對象 107 * @param row {@link Row} 108 * @param genericClass List中存儲值 的class類型 109 * @return 返回Java對象 110 */ 111 public static <T> T conversion(Class<T> clazz, Row row, Map<String, Class<?>> genericClass) { 112 return conversion(clazz, row, genericClass, null); 113 } 114 115 public static <T> T transform(T target, Row row, Map<String, Class<?>> valClass, Map<String, Class<?>> keyClass) { 116 117 ColumnDefinitions cols = row.getColumnDefinitions(); 118 Iterator<Definition> definitionIter = null; 119 120 definitionIter = cols.iterator(); 121 while (definitionIter.hasNext()) { 122 Definition definition = definitionIter.next(); 123 124 DataType type = definition.getType(); 125 String columnName = definition.getName(); 126 debug(String.format("列名：%s，列類型：%s", columnName, type)); 127 128 Object value = getData(row, type, columnName, valClass, keyClass); 129 debug(String.format("列名：%s，取值：%s", columnName, value)); 130 131 String camelName = camelName(columnName); 132 try { 133 PropertyUtils.setProperty(target, camelName, value); 134 } catch (IllegalAccessException | InvocationTargetException e) { 135 log("設置{}值發生異常：", camelName, e); 136 } catch (NoSuchMethodException ex) { 137 138 if (camelName.equals(camelName.toLowerCase())) { 139 log("This Class '{}' set '{}' method notfound.", new Object[] { target.getClass().getSimpleName(), camelName } ); 140 } else { 141 142 try { 143 PropertyUtils.setProperty(target, camelName.toLowerCase(), value); 144 } catch (IllegalAccessException | InvocationTargetException | IllegalArgumentException e) { 145 log("設置{}值發生異常：", camelName, e); 146 } catch (NoSuchMethodException e) { 147 log("This Class '{}' set '{}' or set '{}' method notfound.", new Object[] { target.getClass().getSimpleName(), camelName, camelName.toLowerCase() } ); 148 } 149 } 150 } 151 } 152 debug("target: " + target); 153 154 return target; 155 } 156 157 /** 158 * <b>function:</b> 將查詢的Row轉換到clazz實例對象返回，row對象存在List、Set、Map集合類型情況 159 * @author hoojo 160 * @createDate 2017-1-20 下午5:36:20 161 * @param target 返回Java對象 162 * @param row {@link Row} 163 * @param valClass List中存儲值 的class類型 164 * @param keyClass List中存儲Key 的class類型 165 * @return 返回Java對象 166 */ 167 public static <T> T conversion(Class<T> clazz, Row row, Map<String, Class<?>> valClass, Map<String, Class<?>> keyClass) { 168 169 T target = BeanUtils.instantiate(clazz); 170 Map<String, PropertyDescriptor> mappedFields = getMappedFields(target.getClass()); 171 172 ColumnDefinitions cols = row.getColumnDefinitions(); 173 Iterator<Definition> definitionIter = cols.iterator(); 174 while (definitionIter.hasNext()) { 175 Definition definition = definitionIter.next(); 176 177 DataType type = definition.getType(); 178 String columnName = definition.getName().toLowerCase(); 179 debug(String.format("列名：%s，列類型：%s", columnName, type)); 180 181 Object value = getData(row, type, columnName, valClass, keyClass); 182 debug(String.format("列名：%s，取值：%s", columnName, value)); 183 184 if (mappedFields.containsKey(columnName)) { 185 try { 186 mappedFields.get(columnName).getWriteMethod().invoke(target, value); 187 } catch (IllegalAccessException | InvocationTargetException e) { 188 log("設置{}值發生異常：{}", columnName, e); 189 } catch (Exception e) { 190 log("設置{}值發生異常：{}", columnName, e.getMessage()); 191 } 192 } else { 193 log("The target Class '{}' in Column '{}' setter method notFound", clazz.getSimpleName(), columnName); 194 } 195 } 196 debug("target: " + target); 197 198 return target; 199 } 200 201 /** 202 * <b>function:</b> 將查詢的Row轉換到target Map對象中返回 203 * @author hoojo 204 * @createDate 2017-1-20 下午5:36:20 205 * @param target 返回Map對象 206 * @param row {@link Row} 207 * @return 返回Map對象 208 */ 209 public static <T> Map<String, T> conversion(Map<String, T> target, Row row) { 210 return conversion(target, row, null); 211 } 212 213 /** 214 * <b>function:</b> 將查詢的Row轉換到target Map對象中返回，row對象存在List、Set集合類型情況 215 * @author hoojo 216 * @createDate 2017-1-20 下午5:36:20 217 * @param target 返回Map對象 218 * @param row {@link Row} 219 * @param genericClass List中存儲值 的class類型 220 * @return 返回Map對象 221 */ 222 public static <T> Map<String, T> conversion(Map<String, T> target, Row row, Map<String, Class<?>> genericClass) { 223 return conversion(target, row, genericClass, null); 224 } 225 226 /** 227 * <b>function:</b> 將查詢的Row轉換到target Map對象中返回，row對象存在Map集合類型情況 228 * @author hoojo 229 * @createDate 2017-1-20 下午5:36:20 230 * @param target 返回Map對象 231 * @param row {@link Row} 232 * @param valClass MAP、List中存儲值 的class類型 233 * @param keyClass MAP Key 的class類型 234 * @return 返回Map對象 235 */ 236 @SuppressWarnings("unchecked") 237 public static <T> Map<String, T> conversion(Map<String, T> target, Row row, Map<String, Class<?>> valClass, Map<String, Class<?>> keyClass) { 238 239 if (target == null) { 240 target = Maps.newHashMap(); 241 } 242 243 ColumnDefinitions cols = row.getColumnDefinitions(); 244 Iterator<Definition> definitionIter = cols.iterator(); 245 while (definitionIter.hasNext()) { 246 Definition definition = definitionIter.next(); 247 248 DataType type = definition.getType(); 249 String columnName = definition.getName().toLowerCase(); 250 debug(String.format("列名：%s，列類型：%s", columnName, type)); 251 252 Object value = getData(row, type, columnName, valClass, keyClass); 253 debug(String.format("列名：%s，取值：%s", columnName, value)); 254 255 String camelName = camelName(columnName); 256 if (value != null) { 257 target.put(camelName, (T) value); 258 } else { 259 target.put(camelName, null); 260 } 261 } 262 debug("target: " + target); 263 264 return target; 265 } 266 267 /** 268 * <b>function:</b> 為cql PreparedStatement對象自動綁定參數值 269 * @author hoojo 270 * @createDate 2017-1-20 下午5:33:18 271 * @param statement PreparedStatement 272 * @param params 參數實體 273 * @return BoundStatement 已綁定值 274 */ 275 public static <T> BoundStatement bind(PreparedStatement statement, Map<String, T> bindParam) { 276 277 BoundStatement boundStatement = null; 278 279 Map<String, T> params = Maps.newHashMap(bindParam); 280 281 Set<String> keys = bindParam.keySet(); 282 Iterator<String> iter = keys.iterator(); 283 while (iter.hasNext()) { 284 String key = iter.next(); 285 T val = bindParam.get(key); 286 params.put(key, val); 287 288 if (!bindParam.containsKey(key.toLowerCase())) { 289 params.put(key.toLowerCase(), val); 290 } 291 292 key = underscoreName(key).toLowerCase(); 293 if (!bindParam.containsKey(key)) { 294 params.put(key, val); 295 } 296 } 297 298 Map<String, Object> bindParams = Maps.newLinkedHashMap(); 299 300 ColumnDefinitions cols = statement.getVariables(); 301 Iterator<Definition> definitionIter = cols.iterator(); 302 while (definitionIter.hasNext()) { 303 Definition definition = definitionIter.next(); 304 305 DataType type = definition.getType(); 306 String columnName = definition.getName().toLowerCase(); 307 debug(String.format("參數列名：%s，參數列類型：%s", columnName, type)); 308 309 Object param = null; 310 if (params.containsKey(columnName)) { 311 param = params.get(columnName); 312 } else { 313 log("The target Map does not exist param '{}' value.", columnName); 314 } 315 debug(String.format("參數列名：%s，參數取值：%s", columnName, param)); 316 317 bindParams.put(columnName, param); 318 } 319 320 debugCQL(statement.getQueryString(), bindParams); 321 322 boundStatement = statement.bind(bindParams.values().toArray()); 323 return boundStatement; 324 } 325 326 /** 327 * <b>function:</b> 為cql PreparedStatement對象自動綁定參數值 328 * @author hoojo 329 * @createDate 2017-1-20 下午5:33:18 330 * @param statement PreparedStatement 331 * @param bindEntity 參數實體 332 * @return BoundStatement 已綁定值 333 */ 334 public static <T> BoundStatement bind(PreparedStatement statement, T bindEntity) { 335 336 BoundStatement boundStatement = null; 337 338 Map<String, Object> params = Maps.newLinkedHashMap(); 339 Map<String, PropertyDescriptor> mappedFields = getMappedFields(bindEntity.getClass()); 340 341 ColumnDefinitions cols = statement.getVariables(); 342 Iterator<Definition> definitionIter = cols.iterator(); 343 while (definitionIter.hasNext()) { 344 Definition definition = definitionIter.next(); 345 346 DataType type = definition.getType(); 347 String columnName = definition.getName().toLowerCase(); 348 debug(String.format("參數列名：%s，參數列類型：%s", columnName, type)); 349 350 Object param = null; 351 if (mappedFields.containsKey(columnName)) { 352 try { 353 param = mappedFields.get(columnName).getReadMethod().invoke(bindEntity); 354 } catch (IllegalAccessException | InvocationTargetException e) { 355 log("設置{}值發生異常：", columnName, e); 356 } 357 } else { 358 log("The target Class '{}' in Column '{}' getter method notFound", bindEntity.getClass().getSimpleName(), columnName); 359 } 360 debug(String.format("參數列名：%s，參數取值：%s", columnName, param)); 361 362 params.put(columnName, param); 363 } 364 365 debugCQL(statement.getQueryString(), params); 366 367 boundStatement = statement.bind(params.values().toArray()); 368 return boundStatement; 369 } 370 371 /** 372 * <b>function:</b> 調試cql語句，將占位符替換參數值 373 * @author hoojo 374 * @createDate 2017-1-20 下午5:30:48 375 * @param queryString cql語句 376 * @param params 參數 377 */ 378 private static void debugCQL(String queryString, Map<String, Object> params) { 379 380 if (DEBUG) { 381 Set<String> keys = params.keySet(); 382 383 Object[] keyArrays = keys.toArray(); 384 for (int i = 0; i < keys.size(); i++) { 385 386 queryString = StringUtils.replaceOnce(queryString, "?", MapUtils.getString(params, keyArrays[i], "NULL")); 387 } 388 logger.info("debug cql: {}", queryString); 389 } 390 } 391 392 private static void debug(String log) { 393 394 if (DEBUG) { 395 logger.info(log); 396 } 397 } 398 399 private static void log(String msg, Object... args) { 400 401 if ("INFO".equalsIgnoreCase(LOG_LEVEL)) { 402 logger.info(msg, args); 403 } else if ("WARN".equalsIgnoreCase(LOG_LEVEL)) { 404 logger.warn(msg, args); 405 } else if ("DEBUG".equalsIgnoreCase(LOG_LEVEL)) { 406 logger.debug(msg, args); 407 } else if ("TRACE".equalsIgnoreCase(LOG_LEVEL)) { 408 logger.trace(msg, args); 409 } else if ("ERROR".equalsIgnoreCase(LOG_LEVEL)) { 410 logger.error(msg, args); 411 } 412 } 413 414 /** 415 * <b>function:</b> 獲取對象的setter方法，並返回下劃線命名和全小寫命名的Map集合 416 * @author hoojo 417 * @createDate 2017-1-20 下午5:31:21 418 * @param clazz 目標對象class 419 * @return Map 420 */ 421 private static Map<String, PropertyDescriptor> getMappedFields(Class<?> clazz) { 422 Map<String, PropertyDescriptor> mappedFields = new HashMap<String, PropertyDescriptor>(); 423 424 PropertyDescriptor[] pds = BeanUtils.getPropertyDescriptors(clazz); 425 for (PropertyDescriptor pd : pds) { 426 if (pd.getWriteMethod() != null) { 427 428 //setUserId->userid,user_id; 429 mappedFields.put(pd.getName().toLowerCase(), pd); 430 431 String underscoreName = underscoreName(pd.getName()); 432 if (!pd.getName().toUpperCase().equals(underscoreName)) { 433 mappedFields.put(underscoreName.toLowerCase(), pd); 434 } 435 } 436 } 437 438 return mappedFields; 439 } 440 441 /** 442 * <b>function:</b> 獲取cql 的值 443 * @author hoojo 444 * @createDate 2017-1-20 下午5:26:24 445 * @param row {@link Row} 446 * @param type 列類型 447 * @param columnName 列名 448 * @param valClass MAP、List中存儲值 的class類型 449 * @param keyClass MAP Key 的class類型 450 * @return 451 */ 452 private static Object getData(Row row, DataType type, String columnName, Map<String, Class<?>> valClass, Map<String, Class<?>> keyClass) { 453 454 Object value = null; 455 456 try { 457 458 if (type == DataType.bigint()) { 459 value = row.getLong(columnName); 460 } else if (type == DataType.cboolean()) { 461 value = row.getBool(columnName); 462 } else if (type == DataType.blob()) { 463 value = row.getBytes(columnName); 464 } else if (type == DataType.timestamp()) { 465 value = row.getDate(columnName); 466 } else if (type == DataType.decimal()) { 467 value = row.getDecimal(columnName); 468 } else if (type == DataType.cfloat()) { 469 value = row.getFloat(columnName); 470 } else if (type == DataType.inet()) { 471 value = row.getInet(columnName); 472 } else if (type == DataType.cint()) { 473 value = row.getInt(columnName); 474 } else if (type.isCollection() && type.asJavaClass() == List.class) { 475 value = getCollectionData(row, type, columnName, valClass); 476 } else if (type.isCollection() && type.asJavaClass() == Set.class) { 477 value = getCollectionData(row, type, columnName, valClass); 478 } else if (type.isCollection() && type.asJavaClass() == Map.class) { 479 value = getCollectionData(row, type, columnName, valClass, keyClass); 480 } else if (type == DataType.varchar()) { 481 value = row.getString(columnName); 482 } else if (type == DataType.uuid() || type == DataType.timeuuid()) { 483 value = row.getUUID(columnName); 484 } else if (type == DataType.varint()) { 485 value = row.getVarint(columnName); 486 } else if (type == DataType.cdouble()) { 487 value = row.getDouble(columnName); 488 } else if (type == DataType.text()) { 489 value = row.getString(columnName); 490 } 491 492 } catch (Exception e) { 493 log("獲取{}值發生異常：", columnName, e); 494 } 495 496 if (value == null) { 497 log("Column '{}' Type({}) get cassandra data is NULL.", columnName, type); 498 } 499 500 return value; 501 } 502 503 /** 504 * <b>function:</b> 獲取cql List集合泛型的值 505 * @author hoojo 506 * @createDate 2017-1-20 下午5:26:24 507 * @param row {@link Row} 508 * @param type 列類型 509 * @param columnName 列名 510 * @param valClass List Value 的class類型 511 * @return 512 */ 513 private static Object getCollectionData(Row row, DataType type, String columnName, Map<String, Class<?>> valClass) { 514 515 Object value = null; 516 517 Class<?> ofValueType = valClass != null ? valClass.get(columnName) : null; 518 List<DataType> typeArguments = type.getTypeArguments(); 519 if (ofValueType == null) { 520 log("Column TypeArguments convter Error, CQL Type: '{} {}' --> '{} {}(NULL)'", new Object[] { columnName, type, columnName, type.getName() }); 521 } else if (ofValueType != typeArguments.get(0).asJavaClass()) { 522 log("Column TypeArguments convter Error, CQL Type: '{} {}({})' --> '{} {}({})'", new Object[] { columnName, type, typeArguments.get(0).asJavaClass(), columnName, valueOf(type.asJavaClass(), ofValueType), ofValueType }); 523 } else if (type.asJavaClass() == List.class) { 524 value = row.getList(columnName, ofValueType); 525 } else if (type.asJavaClass() == Set.class) { 526 value = row.getSet(columnName, ofValueType); 527 } 528 529 return value; 530 } 531 532 /** 533 * <b>function:</b> 獲取cql MAP集合泛型的值 534 * @author hoojo 535 * @createDate 2017-1-20 下午5:26:24 536 * @param row {@link Row} 537 * @param type 列類型 538 * @param columnName 列名 539 * @param valClass MAP Value 的class類型 540 * @param keyClass MAP Key 的class類型 541 * @return 542 */ 543 private static Object getCollectionData(Row row, DataType type, String columnName, Map<String, Class<?>> valClass, Map<String, Class<?>> keyClass) { 544 545 Object value = null; 546 547 Class<?> ofKeyType = keyClass != null ? keyClass.get(columnName) : null; 548 Class<?> ofValueType = valClass != null ? valClass.get(columnName) : null; 549 550 List<DataType> typeArguments = type.getTypeArguments(); 551 if (ofValueType == null && ofKeyType == null) { 552 log("Column TypeArguments convter Error, CQL Type: '{} {}' --> '{} {}<NULL, NULL>'", new Object[] { columnName, type, columnName, type.getName() }); 553 } else if (ofValueType == null) { 554 log("Column TypeArguments convter Error, CQL Type: '{} {}' --> '{} {}<{}, NULL>'", new Object[] { columnName, type, columnName, type.getName(), valueOf(ofKeyType) }); 555 } else if (ofKeyType == null) { 556 log("Column TypeArguments convter Error, CQL Type: '{} {}' --> '{} {}<NULL, {}>'", new Object[] { columnName, type, columnName, type.getName(), valueOf(ofValueType) }); 557 } else if (ofKeyType != typeArguments.get(0).asJavaClass() || ofValueType != typeArguments.get(1).asJavaClass()) { 558 log("Column TypeArguments convter Error, CQL Type: '{} {} (<{}, {}>)' --> '{} {}(<{}, {}>)'", new Object[] { columnName, type, typeArguments.get(0).asJavaClass(), typeArguments.get(1).asJavaClass(), columnName, valueOf(Map.class, ofValueType, ofKeyType), ofKeyType, ofValueType }); 559 } else { 560 value = row.getMap(columnName, ofKeyType, ofValueType); 561 } 562 563 return value; 564 } 565 566 /** 567 * <b>function:</b> 轉換為下劃線命名方式 568 * @author hoojo 569 * @createDate 2017-1-20 下午5:24:50 570 */ 571 public static String underscoreName(String name) { 572 StringBuilder result = new StringBuilder(); 573 if (name != null && name.length() > 0) { 574 // 將第一個字符處理成大寫 575 result.append(name.substring(0, 1).toUpperCase()); 576 // 循環處理其余字符 577 for (int i = 1; i < name.length(); i++) { 578 String s = name.substring(i, i + 1); 579 // 在大寫字母前添加下劃線 580 if (s.equals(s.toUpperCase()) && !Character.isDigit(s.charAt(0))) { 581 result.append("_"); 582 } 583 // 其他字符直接轉成大寫 584 result.append(s.toUpperCase()); 585 } 586 } 587 return result.toString(); 588 } 589 590 /** 591 * <b>function:</b> 駝峰式命名方式 592 * @author hoojo 593 * @createDate 2017-1-20 下午5:25:09 594 */ 595 public static String camelName(String name) { 596 StringBuilder sb = new StringBuilder(); 597 if (!name.contains("_")) { 598 // 不含下劃線，僅將首字母小寫 599 return name.substring(0, 1).toLowerCase() + name.substring(1); 600 } 601 // 用下劃線將原始字符串分割 602 String camels[] = name.split("_"); 603 for (String camel : camels) { 604 // 跳過原始字符串中開頭、結尾的下換線或雙重下劃線 605 if (camel.isEmpty()) { 606 continue; 607 } 608 // 處理真正的駝峰片段 609 if (sb.length() == 0) { 610 // 第一個駝峰片段，全部字母都小寫 611 sb.append(camel.toLowerCase()); 612 } else { 613 // 其他的駝峰片段，首字母大寫 614 sb.append(camel.substring(0, 1).toUpperCase()); 615 sb.append(camel.substring(1).toLowerCase()); 616 } 617 } 618 return sb.toString(); 619 } 620 621 /** 622 * <b>function:</b> java class轉換到cql類型 623 * @author hoojo 624 * @createDate 2017-1-20 下午5:24:09 625 * @param clazz Class 626 * @return {@link DataType} 627 */ 628 private static DataType valueOf(Class<?> clazz) { 629 630 if (clazz == null) { 631 return DataType.custom("NULL"); 632 } 633 if (clazz == long.class || clazz == Long.class) { 634 return DataType.bigint(); 635 } 636 if (clazz == boolean.class || clazz == Boolean.class) { 637 return DataType.cboolean(); 638 } 639 if (clazz == Byte.class || clazz == byte.class) { 640 return DataType.blob(); 641 } 642 if (clazz == Date.class || clazz == Timestamp.class) { 643 return DataType.timestamp(); 644 } 645 if (clazz == BigDecimal.class) { 646 return DataType.decimal(); 647 } 648 if (clazz == float.class || clazz == Float.class) { 649 return DataType.cfloat(); 650 } 651 if (clazz == InetAddress.class) { 652 return DataType.inet(); 653 } 654 if (clazz == int.class || clazz == Integer.class) { 655 return DataType.cint(); 656 } 657 if (clazz == String.class) { 658 return DataType.varchar();// text(); 659 } 660 if (clazz == UUID.class) { 661 return DataType.uuid(); // timeuuid(); 662 } 663 if (clazz == BigInteger.class) { 664 return DataType.varint(); 665 } 666 667 log("Class '{}' unknow DataType in cassandra.", clazz); 668 669 return DataType.custom("unknow"); 670 } 671 672 /** 673 * <b>function:</b> 轉換集合list、set到cql類型 674 * @author hoojo 675 * @createDate 2017-1-20 下午5:22:43 676 * @param clazz java class 677 * @param valueClass 集合值存儲類型class 678 * @param keyClass 集合鍵存儲類型class 679 * @return DataType 680 */ 681 public static DataType valueOf(Class<?> clazz, Class<?> valueClass, Class<?> keyClass) { 682 683 if (clazz == List.class) { 684 return DataType.list(valueOf(valueClass)); 685 } 686 if (clazz == Set.class) { 687 return DataType.set(valueOf(valueClass)); 688 } 689 if (clazz == Map.class) { 690 return DataType.map(valueOf(keyClass), valueOf(valueClass)); 691 } 692 693 log("Class '{}' unknow DataType in cassandra.", clazz); 694 return DataType.custom("unknow"); 695 } 696 697 /** 698 * <b>function:</b> 轉換集合list、set到cql類型 699 * @author hoojo 700 * @createDate 2017-1-20 下午5:22:43 701 * @param clazz java class 702 * @param valueClass 集合存儲類型class 703 * @return DataType 704 */ 705 private static DataType valueOf(Class<?> clazz, Class<?> valueClass) { 706 707 return valueOf(clazz, valueClass, null); 708 } 709 }
