在Android系统中管理SQLite,可以通过使用SQLiteOpenHelper类来实现。SQLiteOpenHelper是一个帮助类,用于管理SQLite数据库的创建、升级和打开操作。
SQLiteOpenHelper类的主要方法包括:
通过SQLiteOpenHelper类,可以方便地进行数据库的创建、升级和操作。以下是一些常见的操作示例:
public class MyDatabaseHelper extends SQLiteOpenHelper {
private static final String DB_NAME = "my_database.db";
private static final int DB_VERSION = 1;
public MyDatabaseHelper(Context context) {
super(context, DB_NAME, null, DB_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
String createTableQuery = "CREATE TABLE IF NOT EXISTS my_table (id INTEGER PRIMARY KEY, name TEXT)";
db.execSQL(createTableQuery);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Perform necessary database upgrades
}
}
MyDatabaseHelper dbHelper = new MyDatabaseHelper(context);
SQLiteDatabase db = dbHelper.getWritableDatabase();
ContentValues values = new ContentValues();
values.put("name", "John Doe");
long newRowId = db.insert("my_table", null, values);
SQLiteDatabase db = dbHelper.getReadableDatabase();
String[] projection = {"id", "name"};
String selection = "name = ?";
String[] selectionArgs = {"John Doe"};
Cursor cursor = db.query("my_table", projection, selection, selectionArgs, null, null, null);
while (cursor.moveToNext()) {
int id = cursor.getInt(cursor.getColumnIndexOrThrow("id"));
String name = cursor.getString(cursor.getColumnIndexOrThrow("name"));
// Process the retrieved data
}
cursor.close();
SQLiteDatabase db = dbHelper.getWritableDatabase();
ContentValues values = new ContentValues();
values.put("name", "Jane Smith");
String selection = "id = ?";
String[] selectionArgs = {"1"};
int count = db.update("my_table", values, selection, selectionArgs);
SQLiteDatabase db = dbHelper.getWritableDatabase();
String selection = "id = ?";
String[] selectionArgs = {"1"};
int count = db.delete("my_table", selection, selectionArgs);
以上是在Android系统中管理SQLite数据库的基本操作示例。对于更复杂的数据库操作,可以参考Android官方文档或其他相关教程进行学习和实践。
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