android SQLiteDatabase源码解析

	源于包android.database.sqlite.SQLiteDatabase

 首先看一下继承和实现了那些基类和接口

 SQLiteDatabase extends SQLiteClosable  implements Closeable 
	Closeable extends AutoCloseable
 
interface   AutoCloseable ／／java. lang
void close() throws Exception;
Defines an interface for classes that can (or need to) be closed once they * are not used any longer. Calling the {@code close} method releases resources * that the object holds.
一旦不用回收释放资源,关闭资源
interface Closeable extends AutoCloseable   //java.io
void close() throws IOException;
Closeable 是可以关闭的数据源或目标。调用 close 方法可释放对象保存的资源（如打开文件）
关闭此流并释放与此流关联的所有系统资源。如果已经关闭该流，则调用此方法无效。 
abstract class SQLiteClosable implements Closeable //  抽象类
abstract void onAllReferencesReleased();／／
void onAllReferencesReleasedFromContainer()
void acquireReference()
void releaseReference()
void releaseReferenceFromContainer()
public void close() {
    releaseReference();／／实现Closeable的方法
}

final class SQLiteDatabase 
public static SQLiteDatabase openDatabase(String path, CursorFactory factory, int flags) {
    return openDatabase(path, factory, flags, null);
}
public static SQLiteDatabase openDatabase(String path, CursorFactory factory, int flags,
        DatabaseErrorHandler errorHandler) {／／路径    cuesor构造器，传null使用默认构造器 
    SQLiteDatabase db = new SQLiteDatabase(path, flags, factory, errorHandler);
    db.open();
    return db;
}
public static boolean deleteDatabase(File file) ／／删除数据库
public void reopenReadWrite()
public Cursor query(boolean distinct, String table, String[] columns,
        String selection, String[] selectionArgs, String groupBy,
        String having, String orderBy, String limit) {
    return queryWithFactory(null, distinct, table, columns, selection, selectionArgs,
            groupBy, having, orderBy, limit, null);
}