将Java时间戳转换为MySQL时间戳，反之亦然

Question

如何将Java时间戳（时间戳数据类型）转换为MySQL时间戳，反之亦然？

Answer 1

If you're using the JDBC API to access the database, and you're using a PreparedStatement to for example execute an SQL INSERT statement, then you just set the timestamp as a parameter to the PreparedStatement :

Timestamp ts = ...; // wherever you get this from

PreparedStatement ps = connection.prepareStatement("INSERT INTO MYTABLE (ts) VALUES (?)");
ps.setTimestamp(1, ts);
ps.executeUpdate();

Likewise, when you're doing a query that returns a timestamp, get it from the ResultSet by calling getTimestamp on it. Example:

Timestamp result = null;

Statement st = connection.createStatement();
ResultSet rs = st.executeQuery("SELECT ts FROM MYTABLE WHERE ...");
if (rs.next()) {
    result = rs.getTimestamp(1);
}

See the JDBC Tutorial .

Answer 2

Without more specifics on the trouble you are having, this will be a hard question to answer. However, Java makes this relatively straightforward if you are using prepared statements. Your code would look something like this:

Connection conn = getConnection();
PreparedStatement pStmt = conn.prepareStatement("UPDATE my_table SET my_column = ? WHERE id = ?");
pStmt.setTimestamp(1, new Timestamp(System.currentTimeMillis()));
pStmt.setInt(2, 42);
pStmt.executeUpdate();

Answer 3

As far as I can see from MySQL docs, java.sql.Timestamp should just work if you read it from or write it to a TIMESTAMP field in the database. So you should not need to do any conversion.