java - JDBC 根据列中的值发现行

Question

在编写此查询时需要大家的帮助。

我有两列，X 和 Y。

我在 Y 列中找到了一个值，我正试图找到它的行号。

或者，我正在尝试做:

SELECT ID in COLUMN_NAME from TABLE_NAME WHERE COLUMN_NAME2 包含一些我已经检索到的值!

private int findRow(int value) throws SQLException {
    Connection mysqlConn = DriverManager.getConnection(DB_URL, USER, PASS);

    try {
        String query ="SELECT BUILDING FROM ALLBUILDINGS WHERE BUILDINGNUMBER = 'value'";
        Statement st = mysqlConn.prepareStatement(query);
        ResultSet rs = st.executeQuery(query);
        while (rs.next()) {
            value = rs.getInt(value);
        }
    } catch (Exception ex) {
        System.out.println(ex.getMessage());
    }

    return value;   
}

有人可以告诉我如何做上述任何一项吗？

提前致谢!

Answer 1

这应该可以解决您的问题。

private int findRow(int value) 抛出 SQLException { 连接 mysqlConn = DriverManager.getConnection(DB_URL, USER, PASS);

try {
    String query ="SELECT BUILDING FROM ALLBUILDINGS WHERE BUILDINGNUMBER = ?";
    PreparedStatement st = mysqlConn.prepareStatement(query);
    st.setInt(1,value);

    ResultSet rs = st.executeQuery(query);
    while (rs.next()) {
        value = rs.getString(1);
    }
} catch (Exception ex) {
    System.out.println(ex.getMessage());
}

return value;