使用Java 8在数据库中将Date作为Date对象插入？

Question

我正在开发一个需要计算日期的项目。我正在寻找一种方法将日期存储为访问数据库中的日期对象，但每个方法都会出错。我在Java 8中使用UcanAccess驱动程序。

我的剥离代码：

//========================== SetupDB =====================================//
public void setupDB() {
    try {
        Class.forName("net.ucanaccess.jdbc.UcanaccessDriver");
        c1 = DriverManager.getConnection(ABDebatePro.DBURL);
        stmt = c1.createStatement();
    }
catch (Exception e) {
        System.out.println(e);
}
}
//========================== InsertDB ====================================//
public void insertDB(int m, String ft, String st, int s1, int s2, Date d) {
    MatchNumber = m;
    FirstTeam = ft;
    SecondTeam = st;
    FirstTeamScore = s1;
    SecondTeamScore = s2;
    MatchDate = d;
    setupDB();
    try {
        String sql = "insert into Schedule (MatchNumber, FirstTeam, SecondTeam, FirstTeamScore, SecondTeamScore, MatchDate)  values " + "(" + m + ",'" + ft + "','" + st + "'," + s1 + "," + s2+ ",'" + d  + "')";
        int z = stmt.executeUpdate(sql);
        c1.close(); 
    } catch (Exception fe) {
        System.out.println(fe);
    }
}
 //========================== Main ========================================//
public static void main(String[] args) {
Schedule sch = new Schedule();
try {
     java.sql.Date date1 = java.sql.Date.valueOf("2016-10-25");
     sch.insertDB(3, "Turtles", "Aligators", 4, 3, date1);
} catch (Exception ex) {
    System.out.println(ex);
}

我的日志：

insert into Schedule (MatchNumber, FirstTeam, SecondTeam, FirstTeamScore, SecondTeamScore, MatchDate)  values (3,'Turtles','Aligators',4,3,'2016-10-25')
net.ucanaccess.jdbc.UcanaccessSQLException: data exception: invalid datetime format

我的数据库：

Answer 1

您的问题是您正在使用动态SQL 在insertDB中构造SQL语句，并且该语句包含无效的日期文字。您应该使用PreparedStatement和参数化查询，如下所示：

String sql =
        "INSERT INTO Schedule " +
        "(MatchNumber, FirstTeam, SecondTeam, FirstTeamScore, SecondTeamScore, MatchDate) " +
        "VALUES " +
        "(?,?,?,?,?,?)"
PreparedStatement ps = c1.prepareStatement(sql)
ps.setInt(1, m);
ps.setString(2, ft);
ps.setString(3, st);
ps.setInt(4, s1);
ps.setInt(5, s2);
ps.setDate(6, d);
int z = ps.executeUpdate();

Answer 2

您的示例方法：

public void getSqlDate() { 
    Calendar cal = Calendar.getInstance();
    int year = 2016; 
    int month = 9;   //month is zero-based
    int day = 25
    cal.set(year, month, date);
    return new Date(cal.getTime());
}

请注意，java.sql.Date的构造函数确实需要一个long值，表示自1970年1月1日00:00:00 GMT＆＃34;

以来的＃＆＃34;毫秒

请参阅JavaDocs java.sql.Date