09_Android中ContentProvider和Sqllite混合操作，一个项目调用另外一个项目的ContentProvider
1、? 編寫ContentPrivider提供者的Android應用
清單文件
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" ??? package="com.itheima28.sqlitedemo" ??? android:versionCode="1" ??? android:versionName="1.0" > ? ??? <instrumentation ??????? android:name="android.test.InstrumentationTestRunner" ??????? android:targetPackage="com.itheima28.sqlitedemo" > ??? </instrumentation> ? ??? <permission android:name="aa.bb.cc.read" ></permission> ??? <permission android:name="aa.bb.cc.write" ></permission> ? ??? <uses-sdk ??????? android:minSdkVersion="8" ??????? android:targetSdkVersion="19" /> ? ??? <application ??????? android:allowBackup="true" ??????? android:icon="@drawable/ic_launcher" ??????? android:label="@string/app_name" ??????? android:theme="@style/AppTheme" > ??????? <uses-library android:name="android.test.runner" /> ? ??????? <activity ??????????? android:name="com.itheima28.sqlitedemo.MainActivity" ??????????? android:label="@string/app_name" > ??????????? <intent-filter> ??????????????? <action android:name="android.intent.action.MAIN" /> ? ??????????????? <category android:name="android.intent.category.LAUNCHER" /> ??????????? </intent-filter> ??????? </activity> ??????? ??????? <!—注意加上：android:exported="true"，通過它來避免出錯-à ??????? <provider ??????????? android:name=".providers.PersonContentProvider" ??????????? android:authorities="com.itheima28.sqlitedemo.providers.PersonContentProvider" ??????????? android:readPermission="aa.bb.cc.read" ??????????? android:writePermission="aa.bb.cc.write" ??????????? android:exported="true"> ??????? </provider> ??? </application> ? </manifest> |
2 編寫實體Person
package com.itheima28.sqlitedemo.entities; ? publicclass Person { ? ??? privateintid; ??? private String name; ??? privateintage; ??? publicint getId() { ?????? returnid; ??? } ??? publicvoid setId(int id) { ?????? this.id = id; ??? } ??? public String getName() { ?????? returnname; ??? } ??? publicvoid setName(String name) { ?????? this.name = name; ??? } ??? publicint getAge() { ?????? returnage; ??? } ??? publicvoid setAge(int age) { ?????? this.age = age; ??? } ??? public Person() { ?????? super(); ?????? // TODO Auto-generated constructor stub ??? } ??? public Person(int id, String name, int age) { ?????? super(); ?????? this.id = id; ?????? this.name = name; ?????? this.age = age; ??? } ??? @Override ??? public String toString() { ?????? return"Person [id=" + id + ", name=" + name + ", age=" + age + "]"; ??? } } |
3 編寫dbHelper
package com.itheima28.sqlitedemo.db; ? import android.content.Context; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; import android.util.Log; ? /** ?* @author toto ?* 數據庫幫助類，用于創建和管理數據庫的 ?*/ public class PersonSQLiteOpenHelper extends SQLiteOpenHelper{ ???????? private static final String TAG = "PersonSQLiteOpenHelper"; ???????? ???????? public PersonSQLiteOpenHelper(Context context){ ?????????????????? super(context, "itheima28.db", null, 2); ???????? } ???????? ???????? /** ???????? ?* 數據庫第一次創建時回調此方法 ???????? ?* 初始化表 ???????? ?*/ ???????? @Override ???????? public void onCreate(SQLiteDatabase db) { ?????????????????? //操作數據 ?????????????????? String sql = "create table person(_id integer primary key, name varchar(20), age integer);"; ?????????????????? db.execSQL(sql); ???????? } ? ???????? /** ???????? ?* 數據庫的版本號更新時回調此方法 ???????? ?* 更新數據庫的內容(刪除表，添加表，修改表) ???????? ?*/ ???????? @Override ???????? public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { ?????????????????? if (oldVersion == 1 && newVersion == 2) { ??????????????????????????? Log.i(TAG, "數據庫更新啦"); ??????????????????????????? db.execSQL("alter table person add balance integer;"); ?????????????????? } ???????? } ? } |
4 編寫通過sql的Dao操作類
package com.itheima28.sqlitedemo.dao; ? import java.util.ArrayList; import java.util.List; ? import android.content.Context; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; ? import com.itheima28.sqlitedemo.db.PersonSQLiteOpenHelper; import com.itheima28.sqlitedemo.entities.Person; ? public class PersonDao { ? ???????? private PersonSQLiteOpenHelper mOpenHelper;?? // 數據庫的幫助類對象 ? ???????? public PersonDao(Context context) { ?????????????????? mOpenHelper = new PersonSQLiteOpenHelper(context); ???????? } ???????? ???????? /** ???????? ?* 添加到person表一條數據 ???????? ?* @param person ???????? ?*/ ???????? public void insert(Person person) { ?????????????????? SQLiteDatabase db = mOpenHelper.getWritableDatabase(); ?????????????????? if(db.isOpen()) {??????? // 如果數據庫打開, 執行添加的操作 ??????????????????????????? ??????????????????????????? // 執行添加到數據庫的操作 ??????????????????????????? db.execSQL("insert into person(name, age) values(?, ?);", new Object[]{person.getName(), person.getAge()}); ??????????????????????????? ??????????????????????????? db.close();??????? // 數據庫關閉 ?????????????????? } ???????? } ???????? ???????? /** ???????? ?* 更據id刪除記錄 ???????? ?* @param id ???????? ?*/ ???????? public void delete(int id) { ?????????????????? SQLiteDatabase db = mOpenHelper.getWritableDatabase();???????? // 獲得可寫的數據庫對象 ?????????????????? if(db.isOpen()) {??????? // 如果數據庫打開, 執行添加的操作 ??????????????????????????? ??????????????????????????? db.execSQL("delete from person where _id = ?;", new Integer[]{id}); ??????????????????????????? ??????????????????????????? db.close();??????? // 數據庫關閉 ?????????????????? } ???????? } ???????? ? ???????? /** ???????? ?* 根據id找到記錄, 并且修改姓名 ???????? ?* @param id ???????? ?* @param name ???????? ?*/ ???????? public void update(int id, String name) { ?????????????????? SQLiteDatabase db = mOpenHelper.getWritableDatabase(); ?????????????????? if(db.isOpen()) {??????? // 如果數據庫打開, 執行添加的操作 ??????????????????????????? ??????????????????????????? db.execSQL("update person set name = ? where _id = ?;", new Object[]{name, id}); ??????????????????????????? ??????????????????????????? db.close();??????? // 數據庫關閉 ?????????????????? } ???????? } ???????? ???????? public List<Person> queryAll() { ?????????????????? SQLiteDatabase db = mOpenHelper.getReadableDatabase();?????? // 獲得一個只讀的數據庫對象 ?????????????????? if(db.isOpen()) { ??????????????????????????? ??????????????????????????? Cursor cursor = db.rawQuery("select _id, name, age from person;", null); ??????????????????????????? ??????????????????????????? if(cursor != null && cursor.getCount() > 0) { ???????????????????????????????????? List<Person> personList = new ArrayList<Person>(); ???????????????????????????????????? int id; ???????????????????????????????????? String name; ???????????????????????????????????? int age; ???????????????????????????????????? while(cursor.moveToNext()) { ?????????????????????????????????????????????? id = cursor.getInt(0);??????? // 取第0列的數據 id ?????????????????????????????????????????????? name = cursor.getString(1);??? // 取姓名 ?????????????????????????????????????????????? age = cursor.getInt(2);????????????? // 取年齡 ?????????????????????????????????????????????? personList.add(new Person(id, name, age)); ???????????????????????????????????? } ? ???????????????????????????????????? db.close(); ???????????????????????????????????? return personList; ??????????????????????????? } ??????????????????????????? db.close(); ?????????????????? } ?????????????????? return null; ???????? } ???????? ???????? /** ???????? ?* 根據id查詢人 ???????? ?* @param id ???????? ?* @return ???????? ?*/ ???????? public Person queryItem(int id) { ?????????????????? SQLiteDatabase db = mOpenHelper.getReadableDatabase();?????? // 獲得一個只讀的數據庫對象 ?????????????????? if(db.isOpen()) { ??????????????????????????? Cursor cursor = db.rawQuery("select _id, name, age from person where _id = ?;", new String[]{id + ""}); ??????????????????????????? if(cursor != null && cursor.moveToFirst()) { ???????????????????????????????????? int _id = cursor.getInt(0); ???????????????????????????????????? String name = cursor.getString(1); ???????????????????????????????????? int age = cursor.getInt(2); ???????????????????????????????????? db.close(); ???????????????????????????????????? return new Person(_id, name, age); ??????????????????????????? } ??????????????????????????? db.close(); ?????????????????? } ?????????????????? return null; ???????? } } |
5 編寫不是通過sql的操作類
package com.itheima28.sqlitedemo.dao; ? import java.util.ArrayList; import java.util.List; ? import android.content.ContentValues; import android.content.Context; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.util.Log; ? import com.itheima28.sqlitedemo.db.PersonSQLiteOpenHelper; import com.itheima28.sqlitedemo.entities.Person; ? public class PersonDao2 { ? ???????? private static final String TAG = "PersonDao2"; ???????? private PersonSQLiteOpenHelper mOpenHelper;?? // 數據庫的幫助類對象 ? ???????? public PersonDao2(Context context) { ?????????????????? mOpenHelper = new PersonSQLiteOpenHelper(context); ???????? } ???????? ???????? /** ???????? ?* 添加到person表一條數據 ???????? ?* @param person ???????? ?*/ ???????? public void insert(Person person) { ?????????????????? SQLiteDatabase db = mOpenHelper.getWritableDatabase(); ?????????????????? if(db.isOpen()) {??????? // 如果數據庫打開, 執行添加的操作 ??????????????????????????? ??????????????????????????? ContentValues values = new ContentValues(); ??????????????????????????? values.put("name", person.getName());????????????????? // key作為要存儲的列名, value對象列的值 ??????????????????????????? values.put("age", person.getAge()); ??????????????????????????? long id = db.insert("person", "name", values); ??????????????????????????? Log.i(TAG, "id: " + id); ??????????????????????????? ??????????????????????????? db.close();??????? // 數據庫關閉 ?????????????????? } ???????? } ???????? ???????? /** ???????? ?* 更據id刪除記錄 ???????? ?* @param id ???????? ?*/ ???????? public void delete(int id) { ?????????????????? SQLiteDatabase db = mOpenHelper.getWritableDatabase();???????? // 獲得可寫的數據庫對象 ?????????????????? if(db.isOpen()) {??????? // 如果數據庫打開, 執行添加的操作 ??????????????????????????? ??????????????????????????? String whereClause = "_id = ?"; ??????????????????????????? String[] whereArgs = {id + ""}; ??????????????????????????? int count = db.delete("person", whereClause, whereArgs); ??????????????????????????? Log.i(TAG, "刪除了: " + count + "行"); ??????????????????????????? db.close();??????? // 數據庫關閉 ?????????????????? } ???????? } ???????? ???????? /** ???????? ?* 根據id找到記錄, 并且修改姓名 ???????? ?* @param id ???????? ?* @param name ???????? ?*/ ???????? public void update(int id, String name) { ?????????????????? SQLiteDatabase db = mOpenHelper.getWritableDatabase(); ?????????????????? if(db.isOpen()) {??????? // 如果數據庫打開, 執行添加的操作 ??????????????????????????? ContentValues values = new ContentValues(); ??????????????????????????? values.put("name", name); ??????????????????????????? ??????????????????????????? int count? = db.update("person", values, "_id = ?", new String[]{id + ""}); ? ??????????????????????????? Log.i(TAG, "修改了: " + count + "行"); ??????????????????????????? ??????????????????????????? db.close();??????? // 數據庫關閉 ?????????????????? } ???????? } ???????? ???????? public List<Person> queryAll() { ?????????????????? SQLiteDatabase db = mOpenHelper.getReadableDatabase();?????? // 獲得一個只讀的數據庫對象 ?????????????????? if(db.isOpen()) { ??????????????????????????? String[] columns = {"_id", "name", "age"};???? // 需要的列 ??????????????????????????? String selection = null;???? // 選擇條件, 給null查詢所有 ??????????????????????????? String[] selectionArgs = null;?? // 選擇條件的參數, 會把選擇條件中的? 替換成數據中的值 ??????????????????????????? String groupBy = null;?????? // 分組語句? group by name ??????????????????????????? String having = null; // 過濾語句 ??????????????????????????? String orderBy = null;?????? // 排序 ??????????????????????????? ??????????????????????????? Cursor cursor = db.query("person", columns, selection, selectionArgs, groupBy, having, orderBy); ??????????????????????????? ??????????????????????????? int id; ??????????????????????????? String name; ??????????????????????????? int age; ??????????????????????????? if(cursor != null && cursor.getCount() > 0) { ???????????????????????????????????? List<Person> personList = new ArrayList<Person>(); ???????????????????????????????????? ???????????????????????????????????? while(cursor.moveToNext()) {? // 向下移一位, 知道最后一位, 不可以往下移動了, 停止. ?????????????????????????????????????????????? id = cursor.getInt(0); ?????????????????????????????????????????????? name = cursor.getString(1); ?????????????????????????????????????????????? age = cursor.getInt(2); ?????????????????????????????????????????????? ?????????????????????????????????????????????? personList.add(new Person(id, name, age)); ???????????????????????????????????? } ???????????????????????????????????? ???????????????????????????????????? db.close(); ???????????????????????????????????? return personList; ??????????????????????????? } ??????????????????????????? db.close(); ?????????????????? } ?????????????????? return null; ???????? } ???????? ???????? /** ???????? ?* 根據id查詢人 ???????? ?* @param id ???????? ?* @return ???????? ?*/ ???????? public Person queryItem(int id) { ?????????????????? SQLiteDatabase db = mOpenHelper.getReadableDatabase();?????? // 獲得一個只讀的數據庫對象 ?????????????????? if(db.isOpen()) { ??????????????????????????? String[] columns = {"_id", "name", "age"};???? // 需要的列 ??????????????????????????? String selection = "_id = ?";???? // 選擇條件, 給null查詢所有 ??????????????????????????? String[] selectionArgs = {id + ""};???? // 選擇條件的參數, 會把選擇條件中的? 替換成數據中的值 ??????????????????????????? String groupBy = null;?????? // 分組語句? group by name ??????????????????????????? String having = null; // 過濾語句 ??????????????????????????? String orderBy = null;?????? // 排序 ??????????????????????????? ??????????????????????????? Cursor cursor = db.query("person", columns, selection, selectionArgs, groupBy, having, orderBy); ??????????????????????????? ??????????????????????????? if(cursor != null && cursor.moveToFirst()) {????????????? // cursor對象不為null, 并且可以移動到第一行 ???????????????????????????????????? int _id = cursor.getInt(0); ???????????????????????????????????? String name = cursor.getString(1); ???????????????????????????????????? int age = cursor.getInt(2); ???????????????????????????????????? ???????????????????????????????????? db.close(); ???????????????????????????????????? return new Person(_id, name, age); ??????????????????????????? } ??????????????????????????? db.close(); ?????????????????? } ?????????????????? return null; ???????? } } |
6 編寫通過sql操作數據庫的單元測試
package com.itheima28.sqlitedemo.test; ? import java.util.List; ? import android.database.sqlite.SQLiteDatabase; import android.test.AndroidTestCase; import android.util.Log; ? import com.itheima28.sqlitedemo.dao.PersonDao; import com.itheima28.sqlitedemo.db.PersonSQLiteOpenHelper; import com.itheima28.sqlitedemo.entities.Person; ? public class TestCase extends AndroidTestCase { ? ???????? private static final String TAG = "TestCase"; ? ???????? public void test() { ?????????????????? // 數據庫什么時候創建 ?????????????????? PersonSQLiteOpenHelper openHelper = new PersonSQLiteOpenHelper(getContext()); ?????????????????? ?????????????????? // 第一次連接數據庫時創建數據庫文件. onCreate會被調用 ?????????????????? openHelper.getReadableDatabase(); ???????? } ???????? ???????? public void testInsert() { ?????????????????? PersonDao dao = new PersonDao(getContext()); ?????????????????? ?????????????????? for (int i = 0; i < 20; i++) { ??????????????????????????? dao.insert(new Person(0, "冠希" + i, 10 + i)); ?????????????????? } ???????? } ???????? ???????? public void testDelete() { ?????????????????? PersonDao dao = new PersonDao(getContext()); ?????????????????? dao.delete(1); ???????? } ? ???????? public void testUpdate() { ?????????????????? PersonDao dao = new PersonDao(getContext()); ?????????????????? dao.update(3, "鳳姐"); ???????? } ? ???????? public void testQueryAll() { ?????????????????? PersonDao dao = new PersonDao(getContext()); ?????????????????? List<Person> personList = dao.queryAll(); ?????????????????? ?????????????????? for (Person person : personList) { ??????????????????????????? Log.i(TAG, person.toString()); ?????????????????? } ???????? } ? ???????? public void testQueryItem() { ?????????????????? PersonDao dao = new PersonDao(getContext()); ?????????????????? Person person = dao.queryItem(4); ?????????????????? Log.i(TAG, person.toString()); ???????? } ???????? ???????? public void testTransaction() { ?????????????????? PersonSQLiteOpenHelper openHelper = new PersonSQLiteOpenHelper(getContext()); ?????????????????? SQLiteDatabase db = openHelper.getWritableDatabase(); ?????????????????? ?????????????????? if(db.isOpen()) { ??????????????????????????? try { ???????????????????????????????????? // 開啟事務 ???????????????????????????????????? db.beginTransaction(); ???????????????????????????????????? ???????????????????????????????????? // 1. 從張三賬戶中扣1000塊錢 ???????????????????????????????????? db.execSQL("update person set balance = balance - 1000 where name = 'zhangsan';"); ???????????????????????????????????? ???????????????????????????????????? // ATM機, 掛掉了. ???????????????????????????????????? // int result = 10 / 0; ???????????????????????????????????? ???????????????????????????????????? // 2. 向李四賬戶中加1000塊錢 ???????????????????????????????????? db.execSQL("update person set balance = balance + 1000 where name = 'lisi';"); ???????????????????????????????????? ???????????????????????????????????? // 標記事務成功 ???????????????????????????????????? db.setTransactionSuccessful(); ??????????????????????????? } finally { ???????????????????????????????????? // 停止事務 ???????????????????????????????????? db.endTransaction(); ??????????????????????????? } ??????????????????????????? db.close(); ?????????????????? } ???????? } ???????? ???????? public void testTransactionInsert() { ?????????????????? PersonSQLiteOpenHelper openHelper = new PersonSQLiteOpenHelper(getContext()); ?????????????????? SQLiteDatabase db = openHelper.getWritableDatabase(); ?????????????????? ?????????????????? if(db.isOpen()) { ??????????????????????????? ??????????????????????????? // 1. 記住當前的時間 ??????????????????????????? long start = System.currentTimeMillis(); ??????????????????????????? ??????????????????????????? // 2. 開始添加數據 ??????????????????????????? try { ???????????????????????????????????? db.beginTransaction(); ???????????????????????????????????? for (int i = 0; i < 10000; i++) { ?????????????????????????????????????????????? db.execSQL("insert into person(name, age, balance) values('wang" + i + "', " + (10 + i) + ", " + (10000 + i) + ")"); ???????????????????????????????????? } ???????????????????????????????????? db.setTransactionSuccessful(); ??????????????????????????? } finally { ???????????????????????????????????? db.endTransaction(); ??????????????????????????? } ??????????????????????????? ??????????????????????????? // 3. 記住結束時間, 計算耗時時間 ??????????????????????????? long end = System.currentTimeMillis(); ??????????????????????????? ??????????????????????????? long diff = end - start; ??????????????????????????? Log.i(TAG, "耗時: " + diff + "毫秒"); ??????????????????????????? ??????????????????????????? db.close(); ?????????????????? } ???????? } } |
7 編寫不是通過sql操作的數據庫的單元測試
package com.itheima28.sqlitedemo.test; ? import java.util.List; ? import android.test.AndroidTestCase; import android.util.Log; ? import com.itheima28.sqlitedemo.dao.PersonDao2; import com.itheima28.sqlitedemo.db.PersonSQLiteOpenHelper; import com.itheima28.sqlitedemo.entities.Person; ? public class TestCase2 extends AndroidTestCase { ? ???????? private static final String TAG = "TestCase"; ? ???????? public void test() { ?????????????????? // 數據庫什么時候創建 ?????????????????? PersonSQLiteOpenHelper openHelper = new PersonSQLiteOpenHelper(getContext()); ?????????????????? ?????????????????? // 第一次連接數據庫時創建數據庫文件. onCreate會被調用 ?????????????????? openHelper.getReadableDatabase(); ???????? } ???????? ???????? public void testInsert() { ?????????????????? PersonDao2 dao = new PersonDao2(getContext()); ?????????????????? dao.insert(new Person(0, "zhouqi", 88)); ???????? } ???????? ???????? public void testDelete() { ?????????????????? PersonDao2 dao = new PersonDao2(getContext()); ?????????????????? dao.delete(8); ???????? } ? ???????? public void testUpdate() { ?????????????????? PersonDao2 dao = new PersonDao2(getContext()); ?????????????????? dao.update(3, "fengjie"); ???????? } ? ???????? public void testQueryAll() { ?????????????????? PersonDao2 dao = new PersonDao2(getContext()); ?????????????????? List<Person> personList = dao.queryAll(); ?????????????????? ?????????????????? for (Person person : personList) { ??????????????????????????? Log.i(TAG, person.toString()); ?????????????????? } ???????? } ? ???????? public void testQueryItem() { ?????????????????? PersonDao2 dao = new PersonDao2(getContext()); ?????????????????? Person person = dao.queryItem(4); ?????????????????? Log.i(TAG, person.toString()); ???????? } } |
8 Activity不用寫東西
?
二、第二個測試項目調用第一個項目的ContentProvider
清單文件如下：
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" ??? package="com.itheima28.othercontentprovider" ??? android:versionCode="1" ??? android:versionName="1.0" > ??? ??? <instrumentation ??????? android:name="android.test.InstrumentationTestRunner" ??????? android:targetPackage="com.itheima28.othercontentprovider"> ??? </instrumentation> ??? <uses-permission android:name="aa.bb.cc.read"/> ??? <uses-permission android:name="aa.bb.cc.write"/> ??? ??? <uses-sdk ??????? android:minSdkVersion="8" ??????? android:targetSdkVersion="19" /> ? ??? <application ??????? android:allowBackup="true" ??????? android:icon="@drawable/ic_launcher" ??????? android:label="@string/app_name" ??????? android:theme="@style/AppTheme" > ??????? <uses-library android:name="android.test.runner"/> ??????? ??????? <activity ??????????? android:name="com.itheima28.othercontentprovider.MainActivity" ??????????? android:label="@string/app_name" > ??????????? <intent-filter> ??????????????? <action android:name="android.intent.action.MAIN" /> ? ??????????????? <category android:name="android.intent.category.LAUNCHER" /> ??????????? </intent-filter> ??????? </activity> ??? </application> ? </manifest> |
2 Activity不用寫
3 單元測試類如下：
package com.itheima28.othercontentprovider; ? import android.content.ContentResolver; import android.content.ContentUris; import android.content.ContentValues; import android.database.Cursor; import android.net.Uri; import android.test.AndroidTestCase; import android.util.Log; ? publicclass TextCase extends AndroidTestCase { ? ??? privatestaticfinal String TAG = "TextCase"; ??? ??? publicvoid testInsert() { ?????? Uri uri = Uri.parse("content://com.itheima28.sqlitedemo.providers.PersonContentProvider/person/insert"); ?????? ?????? //內容提供者訪問對象 ?????? ContentResolver resolver = getContext().getContentResolver(); ?????? ?????? ContentValues values = new ContentValues(); ?????? values.put("name", "fengjie"); ?????? values.put("age", 90); ?????? ?????? uri = resolver.insert(uri, values); ?????? Log.i(TAG, "uri:" + uri); ?????? long id = ContentUris.parseId(uri); ?????? Log.i(TAG, "添加到：" + id); ??? } ??? ??? publicvoid testDelete() { ?????? Uri uri = Uri.parse("content://com.itheima28.sqlitedemo.providers.PersonContentProvider/person/delete"); ?????? ?????? //內容提供者訪問對象 ?????? ContentResolver resolver = getContext().getContentResolver(); ?????? ?????? String where = "_id = ?"; ?????? String[] selectionArgs = {"21"}; ?????? int count = resolver.delete(uri, where, selectionArgs); ?????? Log.i(TAG, "刪除行：" + count); ??? } ??? ??? publicvoid testUpdate() { ?????? Uri uri = Uri.parse("content://com.itheima28.sqlitedemo.providers.PersonContentProvider/person/update"); ??? ?????? //內容提供者訪問對象 ?????? ContentResolver resolver = getContext().getContentResolver(); ?????? ?????? ContentValues values = new ContentValues(); ?????? values.put("name", "lisi"); ?????? ?????? int count = resolver.update(uri, values,"_id = ?", new String[]{"20"}); ?????? Log.i(TAG, "更新行：" + count); ??? } ??? ??? publicvoid testQueryAll() { ?????? Uri uri = Uri.parse("content://com.itheima28.sqlitedemo.providers.PersonContentProvider/person/queryAll"); ?????? ?????? //內容提供者訪問對象 ?????? ContentResolver resolver = getContext().getContentResolver(); ?????? Cursor cursor = resolver.query(uri, new String[]{"_id", "name", "age"}, null, null, "_id desc"); ?????? ?????? if (cursor != null && cursor.getCount() > 0) { ?????????? int id; ?????????? String name; ?????????? int age; ?????????? while(cursor.moveToNext()){ ????????????? id = cursor.getInt(0); ????????????? name = cursor.getString(1); ????????????? age = cursor.getInt(2); ????????????? Log.i(TAG, "id: " + id + ", name: " + name + ", age: " + age); ?????????? } ?????????? cursor.close(); ?????? } ??? } ??? ??? publicvoid testQuerySingleItem() { ?????? Uri uri = Uri.parse("content://com.itheima28.sqlitedemo.providers.PersonContentProvider/person/query/#"); ?????? ?????? // 在uri的末尾添加一個id content://com.itheima28.sqlitedemo.providers.PersonContentProvider/person/query/20 ?????? uri = ContentUris.withAppendedId(uri, 20); ?????? ?????? //內容提供者訪問對象 ?????? ContentResolver resolver = getContext().getContentResolver(); ?????? Cursor cursor = resolver.query(uri, new String[]{"_id", "name", "age"}, null, null, null); ?????? if (cursor != null && cursor.moveToFirst()) { ?????????? int id = cursor.getInt(0); ?????????? String name = cursor.getString(1); ?????????? int age = cursor.getInt(2); ????? ?????????? cursor.close(); ?????????? Log.i(TAG, "id: " + id + ", name: " + name + ", age: " + age); ?????? } ??? } } |
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總結
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