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Wipe database on downgrade

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PiperOrigin-RevId: 230203593
This commit is contained in:
olly 2019-01-21 11:42:47 +00:00 committed by Oliver Woodman
parent 93e24561bb
commit fb6154a905
1 changed files with 36 additions and 2 deletions
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38
library/core/src/main/java/com/google/android/exoplayer2/database/ExoDatabaseProvider.java
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@ -16,8 +16,11 @@
package com.google.android.exoplayer2.database;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import com.google.android.exoplayer2.util.Log;
/**
* An {@link SQLiteOpenHelper} that provides instances of a standalone ExoPlayer database.
@ -32,6 +35,7 @@ public final class ExoDatabaseProvider extends SQLiteOpenHelper implements Datab
public static final String DATABASE_NAME = "exoplayer_internal.db";
private static final int VERSION = 1;
private static final String TAG = "ExoDatabaseProvider";
public ExoDatabaseProvider(Context context) {
super(context.getApplicationContext(), DATABASE_NAME, /* factory= */ null, VERSION);
@ -49,7 +53,37 @@ public final class ExoDatabaseProvider extends SQLiteOpenHelper implements Datab
@Override
public void onDowngrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO: Wipe the database.
super.onDowngrade(db, oldVersion, newVersion);
wipeDatabase(db);
}
/**
* Makes a best effort to wipe the existing database. The wipe may be incomplete if the database
* contains foreign key constraints.
*/
private static void wipeDatabase(SQLiteDatabase db) {
String[] columns = {"type", "name"};
try (Cursor cursor =
db.query(
"sqlite_master",
columns,
/* selection= */ null,
/* selectionArgs= */ null,
/* groupBy= */ null,
/* having= */ null,
/* orderBy= */ null)) {
while (cursor.moveToNext()) {
String type = cursor.getString(0);
String name = cursor.getString(1);
if (!"sqlite_sequence".equals(name)) {
// If it's not an SQL-controlled entity, drop it
String sql = "DROP " + type + " IF EXISTS " + name;
try {
db.execSQL(sql);
} catch (SQLException e) {
Log.e(TAG, "Error executing " + sql, e);
}
}
}
}
}
}