H2 Java WHERE 子句找不到 VARCHAR 列

Question

我在我的 Java 应用程序（非 Spring）中使用了 H2 内存数据库。除了我使用 WHERE 过滤器的查询外，我大部分时间都在工作。

以下是我的一些有效方法。

创建表方法（按预期工作）：

private void createIntervalETATable() throws SQLException {
    Connection connection = DriverManager.getConnection(DB_URL , USER , PASS);
    Statement statement = connection.createStatement();
    String createTableSQL = "CREATE TABLE tripScheduleETA (" +
            "id INT NOT NULL AUTO_INCREMENT," +
            "trip_number VARCHAR(255)," +
            "booking_id VARCHAR(255)," +
            "planned_arrival TIMESTAMP," +
            "next_eta_schedule TIMESTAMP," +
            "next_destination_geo_code VARCHAR(255)," +
            "PRIMARY KEY (id)" +
            ");";
    statement.execute(createTableSQL);
    statement.close();
    connection.close();
    System.out.println("Table `tripScheduleEta` Created");
}

打印所有数据（按预期工作）：

public void printAllData() throws SQLException {
    Connection connection = DriverManager.getConnection(DB_URL, USER, PASS);
    Statement statement = connection.createStatement();
    String getAllSQL = "SELECT * FROM tripScheduleETA";
    ResultSet result = statement.executeQuery(getAllSQL);

    while (result.next()) {
        int id = result.getInt("id");
        String trip_number = result.getString("trip_number");
        String booking_id = result.getString("trip_number");
        String planned_arrival = result.getString("planned_arrival");
        String next_eta_schedule = result.getString("next_eta_schedule");
        String next_destination_geocode = result.getString("next_destination_geo_code");

        System.out.println(trip_number + " | " + booking_id + " | " + planned_arrival + " | " + next_eta_schedule + " | " + next_destination_geocode);
    }
}

按日期范围获取查询（工作）：

public JSONArray fetchForETAByDateRange(String dateFrom , String dateTo) throws SQLException {
    Connection connection = DriverManager.getConnection(DB_URL , USER , PASS);
    Statement statement = connection.createStatement();
    String fetchByDateRangeSQL = "SELECT * FROM tripScheduleETA " +
            "WHERE next_eta_schedule "  +
            "BETWEEN '" + dateFrom + "' AND '" + dateTo + "';";
    ResultSet result = statement.executeQuery(fetchByDateRangeSQL);
    return convertResultSetToJSONArray(result);
}

这是我在 VARCHAR 列上使用 WHERE 子句时遇到问题的地方，它总是返回空，我确定该行存在（尝试过 SELECT *）

public JSONArray fetchByBookingId(String booking_id) throws SQLException{
    Connection connection = DriverManager.getConnection(DB_URL , USER , PASS);
    Statement statement = connection.createStatement();
    String fetchByBookingIdSQL = "SELECT * FROM tripScheduleETA " +
            "WHERE booking_id " +
            "IN ('" + booking_id + "') ;";
    ResultSet result = statement.executeQuery(fetchByBookingIdSQL);
    return convertResultSetToJSONArray(result);
}

我尝试在列 ID 上使用 WHERE 子句，我能够得到我需要的行，但是当我使用 VARCHAR 时，我似乎无法得到它。

Answer 1

您应该使用 preparedStatement 并创建一个数组。

PreparedStatement statement =
    connection.prepareStatement("Select * from demoTable where test IN (?)");

Array array =
    statement.getConnection().createArrayOf("VARCHAR", new Object[]{"a1", "b2","c3"});

statement.setArray(1, array);

ResultSet rs = statement.executeQuery();

Answer 2

发现我过滤查询请求的方式没有问题

IN

和

=

都有效，问题是打字错误