java sql 插入时间戳 java.sql.SQLSyntaxErrorException

Question

我正在尝试将 timestamp 插入到我的数据库中，但我一直收到 java.sql.SQLSyntaxErrorException:

这是我的代码

java.sql.Timestamp sqlDate = new java.sql.Timestamp(new java.util.Date().getTime());
System.out.println(sqlDate);

这里插入和连接到DB

Connection conn = DriverManager.getConnection("jdbc:derby://localhost:1598/VotingDB", "app", "app");
    Statement st = conn.createStatement();
    String sql = "INSERT INTO VOTES (CANDIDATE_NAME,VOTER_SSN,TIMESTAMP) "
            + "VALUES ('" + Candidate_Name + "','" + ssn + "'," + TimeStamp + ")";

    st.executeUpdate(sql);
    st.close();
    conn.close();
} catch (SQLException ex) {
    System.out.println("Connection failed adding vote " + ex);
}

错误

2017-04-09 20:10:02.825 Connection failed adding vote java.sql.SQLSyntaxErrorException: Syntax error: Encountered "20" at line 1, column 94.

Answer 1

你应该像这样把你的时间放在 '' 之间:

"VALUES ('" + Candidate_Name + "','" + ssn + "', ' " + TimeStamp + "')";

但这不够安全，您必须使用 PreparedStatement 来避免任何 SQL 注入(inject)。

例如:

String sql = "INSERT INTO VOTES (CANDIDATE_NAME, VOTER_SSN, TIMESTAMP) VALUES (?, ?, ?)";

try (PreparedStatement stm = connection.prepareStatement(sql)) {

    stm.setString(1, Candidate_Name );
    stm.setString(2, ssn );
    stm.setDate(3, TimeStamp);

    stm.executeUpdate();
}