查询有2个Where子句

Question

i am trying to login and want to validate username and password against the records in the database. I am not sure how to pass two Where clause

public Boolean login(String username, String password) throws SQLException {
    Cursor mCursor = db.query(TABLE_USERS, new String[] { ID,
            KEY_NAME, KEY_USERNAME}, KEY_USERNAME + "="
            + "'"+username+"'", KEY_PASSWORD + "="
            + "'"+password+"'", null, null, null, null, null);

    if (mCursor.moveToFirst()) {
        return true;
    }
    return false;
}

Am getting a Syntax Error.

Answer 1

不要使用两个where子句（在任何情况下我都不认为这是ANSI SQL允许的），请使用AND运算符将它们联接起来，使其看起来像：

KEY_NAME + " = '" + username + "' AND " + KEY_PASSWORD + " = '" + password + "'"