java - 在 SQL 数据库中存储时间戳

Question

我在将值存储到我在 Netbeans 中创建的 SQL 数据库中时遇到问题。

String bladeSerial;
String bladeType;
LocalTime startTime1;

private void startButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                             


    Connection conn = null; 
    Statement st = null;
try {
    conn = DriverManager.getConnection ("jdbc:derby://localhost:1527/db01", "Administrator", "admin"); //run procedure getConnection to connect to the database - see below
     st = conn.createStatement(); //set up a statement st to enable you to send SQL statements to the database.
} catch (SQLException ex) {
    Logger.getLogger(FormTwo1.class.getName()).log(Level.SEVERE, null, ex);
}


        System.out.println ("Successful Connection");


String query = "insert into TB01(SERIAL,BLADETYPE,STARTT1) values ('+bladeSerial+', '+itemText+', '+(String.valueOf(startTime1))+')";
try (PreparedStatement pstmt = conn.prepareStatement(query)) {
    pstmt.setString(1, bladeSerial);
    pstmt.setString(2, bladeType);
    pstmt.setString(3, String.valueOf(startTime1));
    pstmt.executeUpdate();
} catch (SQLException ex) {
    // Exception handling
    Logger.getLogger(FormTwo1.class.getName()).log(Level.SEVERE, null, ex);
}

startTime1 变量以 HH:mm:ss.SSS 格式保存。运行代码时，出现错误:

java.sql.SQLSyntaxErrorException: Syntax error: Encountered ":" at line 1, column 65.

错误指的是时间中的冒号，但我不知道如何解决这个问题。

SERIAL 是 VARCHAR(5)，BLADETYPE 是 VARCHAR(80)， STARTT1 是一个 VARCHAR(12)。所有列都在 DATA 表中。

Answer 1

改用PreparedStatement，并使用set*方法设置参数:

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("HH:mm:ss.SSS");
String query = "insert into DATA(SERIAL,BLADETYPE,STARTT1) values (?, ?, ?)";
try (PreparedStatement pstmt = conn.prepateStatement(query)) {
    pstmt.setString(1, bladeSerial);
    pstmt.setString(2, bladeType);
    pstmt.setString(3, startTime1.format(formatter));
    pstmt.executeUpdate();
} catch (SQLException e) {
    // Exception handling
}