SQlite的数据库查询

多表查询 + 数据字典查询点击打开链接

数据字典

 

 

 

 

1 select b.codedesc,a.[branum],d.codedesc,c.codedesc 2 from BI_VEHICLE a  3 join T_PF_DATADICT b  on b.fieldname = 'BRAPREFIX'  and a.braprefix = b.code 4 join T_PF_DATADICT c  on c.fieldname = 'VECTYPE'    and a.vectype = c.code 5 join T_PF_DATADICT d  on d.fieldname = 'TRASTATE'   and a.trastate = d.code 

 

 

把多个字段结果合成一个字段

 

1 select b.codedesc as _id  ,2 a.[casecarnum],  3 a.[credate]||" "||a.[cretime] as credate,4 a.[edidate]||" "||a.[editime] as edidate ,5 a.[pecdate]||" "||a.[pectime] as pecdate,6 a.[casereason],  a.[client_status],  c.[codedesc] as status7 from cp_casinfo a  8 join T_PF_DATADICT b  on b.fieldname = 'BRAPREFIX'  and  a.casecarprefix =  b.code 9 join T_PF_DATADICT c on c.[fieldname] = 'STATUS'    and a.[status] = c.[code]   and c.tablename = 'CP_CASEINFO' 

原字段

合并后的字段

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分页查询数据

 1 /** 2      * 分页获取记录 3      * @param offset 跳过前面多少条记录 4      * @param maxResult 每页获取多少条记录 5      * @return 6      */ 7     public List<Person> getScrollData(int offset, int maxResult) 8     { 9         10         List<Person> persons = new ArrayList<Person>();11         SQLiteDatabase db = dbOpenHelper.getReadableDatabase();12         Cursor cursor = db.rawQuery("select * from person order by personid asc limit ?,?",13                 new String[]{String.valueOf(offset), String.valueOf(maxResult)});14         15         while(cursor.moveToNext())16         {17             int personid = cursor.getInt(cursor.getColumnIndex("personid"));18             int amount = cursor.getInt(cursor.getColumnIndex("amount"));19             String name = cursor.getString(cursor.getColumnIndex("name"));20             String phone = cursor.getString(cursor.getColumnIndex("phone"));21             persons.add(new Person(personid, name, phone, amount));22         }23         cursor.close();24         return persons;25     }

 

数据库的增删改查

 

 1 //方法一 2 ContentValues cv = new ContentValues(); 3 cv.put("CLASS_CODE", clazz.getClassCode()); 4 cv.put("CLASS_NAME", clazz.getClassName()); 5 //返回自增列的 ID 值 6 long lResult = sdb.insert("tableName", null, cv); 7  8  9 //方法二10 //11 SQLiteDatabase db = dbOpenHelper.getWritableDatabase();12 db.execSQL("insert into person(name, phone, amount) values(?,?,?)",13             new Object[]{person.getName(), person.getPhone(), person.getAmount()});

 

 

 1 //方法一 2 int iResult = sdb.delete(DBConstant.TN_CLASS, "ID=?", new String[]{String.valueOf(clazz.getId())}); 3  4 //方法二 5 /** 6  * 删除记录 7  * @param id 记录ID 8  */ 9 public void delete(Integer id){10     SQLiteDatabase db = dbOpenHelper.getWritableDatabase();11     db.execSQL("delete from person where personid=?", new Object[]{id});12 }

 

 1 //方法一 2 ContentValues cv = new ContentValues(); 3 cv.put("CLASS_CODE", clazz.getClassCode()); 4 cv.put("CLASS_NAME", clazz.getClassName()); 5 int iResult = sdb.update(DBConstant.TN_CLASS, cv, "ID=?", new String[]{String.valueOf(clazz.getId())}); 6  7 /** 8 * 更新记录 9 * @param person10 */11 public void update(Person person){12 SQLiteDatabase db = dbOpenHelper.getWritableDatabase();13 db.execSQL("update person set name=?,phone=?,amount=? where personid=?",14         new Object[]{person.getName(), person.getPhone(),  person.getAmount(), person.getId()});15 }

 1     /** 2      * 查询记录 3      * @param id 记录ID 4      * @return 5      */ 6     public Person find(Integer id){ 7         SQLiteDatabase db = dbOpenHelper.getReadableDatabase(); 8         Cursor cursor = db.rawQuery("select * from person where personid=?", new String[]{id.toString()}); 9         if(cursor.moveToFirst()){10             int personid = cursor.getInt(cursor.getColumnIndex("personid"));11             int amount = cursor.getInt(cursor.getColumnIndex("amount"));12             String name = cursor.getString(cursor.getColumnIndex("name"));13             String phone = cursor.getString(cursor.getColumnIndex("phone"));14             return new Person(personid, name, phone, amount);15         }16         cursor.close();17         return null;18     }