Android学习笔记（8）——Sqlite数据库的事务问题

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String str;

    public
void
testTransaction() throws
Exception {

        PersonSQLiteOpenHelper helper =
new
PersonSQLiteOpenHelper(getContext());

        SQLiteDatabase db = helper.getWritableDatabase();

        //开始数据库的事务

        db.beginTransaction();

        try
{

            db.execSQL("update person set account=account-1000 where name=?",

                    new
Object[] { "zhangsan"
});

            str.equals("123");

            db.execSQL("update person set account=account+1000 where name=?",

                    new
Object[] { "lisi"
});

            //设置数据库事务执行成功的flag

            db.setTransactionSuccessful();

        }
finally
{

            //如果执行成功(flag被设置,则commit(),否则rollback回滚

            db.endTransaction();

        }

    }