Android数据储存之SQLiteDatabase 简单增删改查
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SQLiteDatabase 使用
SQLiteDatabase提供如下方法来打开一个文件对应的数据库：
openDatabase(String path, SQLiteDatabase.CursorFactory factory, int flags) 打开path文件所代表的文件
openOrCreateDatabase(String path, SQLiteDatabase.CursorFactory factory) 打开或创建（如果不存在时）path文件所代表的文件
openOrCreateDatabase(File file, SQLiteDatabase.CursorFactory factory) 打开或创建File（如果不存在时）文件所代表的文件
以上方法均返回一个SQLiteDatabase对象！
调用SQLiteDatabase对象中的方法来执行sql操作数据库：
execSQL(String sql, Object[] bindArgs) 执行sql
bindArgs代表sql中的占位符参数的值
insert(String table, String nullColumnHack, ContentValues values) 插入语句，
table表名
values为ContentValues对象！该对象存储方式为Key-value，Key表示表中的字段名称，value表示该字段对应的值
nullColumnHack表示强行向表中插入null，前提是第三个参数（values）为空或者不包含任何Key-value时生效
update(String table, ContentValues values, String whereClause, String[] whereArgs) 更新语句
table为表名
values为ContentValues对象！该对象存储方式为Key-value，Key表示表中的字段名称
value表示该字段对应的值，第三个参数为条件例如：_ID = ? ,第四个参数为第三个参数的值！
delete(String table, String whereClause, String[] whereArgs) 删除数据
table表名
whereClause为条件例如：_ID = ?
whereArgs为whereClause的值！
query(String table, String[] columns, String selection, String[] selectionArgs, String groupBy, String having, String orderBy, String limit) 查询语句
table为表名
columns想要显示的字段
selection条件
selectionArgs 中为selection的值
groupBy 分组
having 分组条件
orderBy 排序
limit 分页
1 public class MainActivity extends Activity implements OnClickListener{ 2 private Button button,btnUpdate,btnDelete,btnQuery; 3 private static String DATABASE_PATH; 4 private static String DATABASE_SQL; 5 private SQLiteDatabase database; 6 @Override 7 protected void onCreate(Bundle savedInstanceState) { 8 super.onCreate(savedInstanceState); 9 setContentView(R.layout.activity_main); 10 initView(); 11 setEvent(); 12 } 13 14 private void setEvent() { 15 button.setOnClickListener(this); 16 btnUpdate.setOnClickListener(this); 17 btnDelete.setOnClickListener(this); 18 btnQuery.setOnClickListener(this); 19 } 20 21 private void initView() { 22 DATABASE_PATH = this.getFilesDir()+"/myDataBase.db"; 23 DATABASE_SQL = "CREATE TABLE USER_INOF(_ID INTEGER PRIMARY KEY,_NAME,_AGE,_ADDRESS)"; 24 database = SQLiteDatabase.openOrCreateDatabase(DATABASE_PATH, null); 25 button = (Button) findViewById(R.id.id_databaseButton); 26 btnUpdate = (Button) findViewById(R.id.id_databaseButtonUpdate); 27 btnDelete =(Button) findViewById(R.id.id_databaseButtonDelete); 28 btnQuery= (Button) findViewById(R.id.id_databaseButtonQuery); 29 } 30 31 @Override 32 public void onClick(View v) { 33 switch (v.getId()) { 34 case R.id.id_databaseButton: 35 //database.execSQL(DATABASE_SQL); 36 ContentValues values = new ContentValues(); 37 values.put("_NAME", "悟空"); 38 values.put("_AGE", "666"); 39 values.put("_ADDRESS", "辽宁"); 40 long i = database.insert("USER_INOF", null, values); 41 if(i==-1){ 42 Toast.makeText(this, "添加失败", 0).show(); 43 }else{ 44 Toast.makeText(this, "添加成功", 0).show(); 45 } 46 break; 47 case R.id.id_databaseButtonUpdate: 48 ContentValues value = new ContentValues(); 49 value.put("_NAME", "猪八戒"); 50 value.put("_AGE", "555"); 51 value.put("_ADDRESS", "辽宁"); 52 database.update("USER_INOF", value, "_ID=?",new String[]{"2"}); 53 break; 54 case R.id.id_databaseButtonDelete: 55 int o = database.delete("USER_INOF", "_ID > ?", new String[]{"1"}); 56 Toast.makeText(this,""+o+"条数据受影响", 0).show(); 57 break; 58 case R.id.id_databaseButtonQuery: 59 Cursor cursor =database.query("USER_INOF", null, null, null, null, null, null); 60 if(cursor.getCount()>0){ 61 while (cursor.moveToNext()) { 62 String id = cursor.getString(0); 63 String name =cursor.getString(1); 64 String age =cursor.getString(2); 65 String address =cursor.getString(3); 66 Toast.makeText(this, "查询成功："+id+name+age+address, 0).show(); 67 } 68 }else{ 69 Toast.makeText(this,""+cursor.getCount()+"", 0).show(); 70 } 71 break; 72 default: 73 break; 74 } 75 } 76 77 }
1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 2 android:layout_width="fill_parent" 3 android:layout_height="fill_parent" 4 android:orientation="vertical" > 5 6 <Button 7 android:id="@+id/id_databaseButton" 8 android:layout_width="match_parent" 9 android:layout_height="wrap_content" 10 android:text="添加数据" /> 11 12 <Button 13 android:id="@+id/id_databaseButtonUpdate" 14 android:layout_width="match_parent" 15 android:layout_height="wrap_content" 16 android:text="修改数据" /> 17 18 <Button 19 android:id="@+id/id_databaseButtonDelete" 20 android:layout_width="match_parent" 21 android:layout_height="wrap_content" 22 android:text="删除数据" /> 23 24 <Button 25 android:id="@+id/id_databaseButtonQuery" 26 android:layout_width="match_parent" 27 android:layout_height="wrap_content" 28 android:text="查询数据" /> 29 30 </LinearLayout>
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