如何使用Java从Sqlite3数据库获取解析日期？ [英] How to get parsed Date from Sqlite3 databse with Java?

问题描述

我通过使用POJO为我的方法创建模型，从sqlite3 DB获取数据。在arraylist中检索数据时，我得到日期解析错误。日期在sqlite3数据库中被定义为时间戳，并且在编译它时抛出：无法解析日期：2015-05-21 12:41:56错误。在编译查询时，它会抛出：解析时间戳时出错我正在使用getDate（）从表中检索日期。

I am getting data from sqlite3 DB, by creating a model for my method with POJO. While retrieving data in a arraylist I am getting parse error for date. The date is defined as timestamp in the sqlite3 DB and while compiling it is throwing : Unparseable date: "2015-05-21 12:41:56" error. And while compiling query it is throwing : Error parsing time stamp I am using getDate() to retrieve date from the table.

public List<EnergyMeter> getAllData() {
    List<EnergyMeter> meters = new ArrayList<EnergyMeter>();
    try {
        LOGGER.info("############### FetchData.getAllData() start");
        Statement statement = DBConnection.getConnection().createStatement();
        ResultSet rs = statement.executeQuery("SELECT * FROM ENERGY_METER");
        LOGGER.info("############### FetchData.getAllData() meters:"+rs.getDate("CREATION_TIME"));
        while (rs.next()) {
            EnergyMeter energyMeter = new EnergyMeter();
            energyMeter.setDEVICE_IP(rs.getString("IP"));
            energyMeter.setCREATION_TIME(rs.getDate("CREATION_TIME"));
            energyMeter.setDESCRIPTION(rs.getString("DESCRIPTION"));
            energyMeter.setDEVICE_NAME(rs.getString("DEVICE_NAME"));
            energyMeter.setEMAIL_ID(rs.getString("EMAIL_ID"));
            energyMeter.setFDU_NAME(rs.getString("FDU_NAME"));
            energyMeter.setICBS(rs.getString("ICBS"));
            energyMeter.setLOCATION(rs.getString("LOCATION"));
            energyMeter.setMAC_ADDRESS(rs.getString("MAC_ADDRESS"));
            energyMeter.setMASTER_ID(rs.getString("MASTER_ID"));
            energyMeter.setPARAMETER(rs.getString("PARAMETER"));
            energyMeter.setPORT(rs.getString("PORT"));
            energyMeter.setPRODUCT_NAME(rs.getString("PRODUCT_NAME"));
            energyMeter.setSMTP(rs.getString("SMTP"));
            energyMeter.setSNMP(rs.getString("SNMP"));
            meters.add(energyMeter);
        }
    } catch (SQLException e) {
        e.printStackTrace();
    }

    LOGGER.info("############### FetchData.getAllData() end");
    return meters;
}

我将日期定义为：私人日期CREATION_TIME; 在POJO。

I defined date as : private Date CREATION_TIME; in POJO.

推荐答案

SQLite3不提供日期类型。

SQLite3 doesn't provide a date type.

你需要把它作为一个String并用Java解析它。

You need to get it as a String and parse it in Java.

new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(rs.getString("CREATION_TIME")); //Throws exception

参见： http://www.sqlite.org/datatype3.html

这篇关于如何使用Java从Sqlite3数据库获取解析日期？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！