db文件的读取

1. 将格式为db的文件拷贝到assets中;
2. 将文件拷贝到/data/data/项目包名/databases/xx.db;
   1. // 将assets中的文件拷贝到系统databases目录下
   2. publicclassDbUtils{
   3. @SuppressLint("SdCardPath")
   4. publicstaticvoid packDataBase(Context context,String dbName){
   5. File file = context.getDatabasePath(dbName);
   6. try{
   7. // 判断下文件是否存在,存在就不用重新拷贝了
   8. if(!file.exists()){
   9. OutputStream os =newFileOutputStream(file);
   10. InputStream is = context.getAssets().open(dbName);
   11. // 文件写入
   12. byte[] buffer =newbyte[1024];
   13. int length;
   14. while((length = is.read(buffer))>0){
   15. os.write(buffer,0, length);
   16. }
   17. // 关闭文件流
   18. os.flush();
   19. os.close();
   20. is.close();
   21. }
   22. }catch(IOException e){
   23. e.printStackTrace();
   24. }
   25. }
   26. }

3. 自定义SQLLiteHlpter类,创建一个名字和步骤1中db名称一样的数据库;
4. 增删改查
5. 电话号码查询归属地示例
   1. publicclassAddressDao{
   2. publicstaticString mAddress ="未知号码";
   4. publicstaticString getAddress(String phone){
   5. mAddress ="未知号码";
   6. DbManager.DaoConfig daoConfig =newDbManager.DaoConfig().setDbName(Constant.DB_ADDRESS)
   7. .setDbVersion(1);
   8. DbManager db = x.getDb(daoConfig);
   9. //正则表达式,匹配手机号码
   10. String regularExpression ="^1[3-8]\\d{9}";
   11. if(phone.matches(regularExpression)){
   12. // 处理手机号码
   13. phone = phone.substring(0,7);
   14. String sql ="select s.location from data1 t left join data2 s on t.outkey=s.id where t.id =? order by s.id;";
   15. SqlInfo sqlInfo =newSqlInfo(sql);
   16. sqlInfo.addBindArg(newKeyValue("id",phone));//key值可以随便写
   17. try{
   18. Cursor cursor = db.execQuery(sqlInfo);
   19. if(cursor.moveToNext()){
   20. mAddress = cursor.getString(0);
   21. }
   22. }catch(DbException e){
   23. e.printStackTrace();
   24. }
   25. }else{
   26. int length = phone.length();
   27. switch(length){
   28. case3://119 110 120 114
   29. if("110".equals(phone)){
   30. mAddress ="报警电话";
   31. }elseif("114".equals(phone)){
   32. mAddress ="查号电话";
   33. }elseif("119".equals(phone)){
   34. mAddress ="火警电话";
   35. }elseif("120".equals(phone)){
   36. mAddress ="抢救电话";
   37. }
   38. break;
   39. case4://5556,5554
   40. mAddress ="模拟器";
   41. break;
   42. case5://10086 99555
   43. mAddress ="服务电话";
   44. break;
   45. case7:
   46. mAddress ="本地电话";
   47. break;
   48. case8:
   49. mAddress ="本地电话";
   50. break;
   51. case11:
   52. //(3+8) 区号+座机号码(外地),查询data2
   53. String area = phone.substring(1,3);
   54. String sql ="select location from data2 where area=?";
   55. SqlInfo sqlInfo =newSqlInfo(sql);
   56. sqlInfo.addBindArg(newKeyValue("area",area));
   57. try{
   58. Cursor cursor = db.execQuery(sqlInfo);
   59. if(cursor.moveToNext()){
   60. String temp = cursor.getString(0);
   61. mAddress= getLocation(temp);
   62. }
   63. }catch(DbException e){
   64. e.printStackTrace();
   65. }
   66. break;
   67. case12:
   68. //(4+8) 区号(0791(江西南昌))+座机号码(外地),查询data2
   69. String area1 = phone.substring(1,4);
   70. String sql1 ="select location from data2 where area=?";
   71. SqlInfo sqlInfo1 =newSqlInfo(sql1);
   72. sqlInfo1.addBindArg(newKeyValue("area",area1));
   73. try{
   74. Cursor cursor = db.execQuery(sqlInfo1);
   75. if(cursor.moveToNext()){
   76. String temp = cursor.getString(0);
   77. mAddress= getLocation(temp);
   78. }
   79. }catch(DbException e){
   80. e.printStackTrace();
   81. }
   82. break;
   83. }
   84. }
   85. return mAddress;
   86. }
   88. privatestaticString getLocation(String location){
   89. String result ="";
   90. if(location.contains("移动")){
   91. result = location.substring(0,location.indexOf("移动"));
   92. }elseif(location.contains("联通")){
   93. result = location.substring(0,location.indexOf("联通"));
   94. }elseif(location.contains("电信")){
   95. result = location.substring(0, location.indexOf("电信"));
   96. }
   97. return result+"固定电话";
   98. }
   99. }

来自为知笔记(Wiz)