我需要将几亿条记录插入mysql db。我要一次插入一百万个。请在下面查看我的代码。它似乎很慢。有什么方法可以优化它吗？

try {
        // Disable auto-commit
        connection.setAutoCommit(false);

        // Create a prepared statement
        String sql = "INSERT INTO mytable (xxx), VALUES(?)";
        PreparedStatement pstmt = connection.prepareStatement(sql);

        Object[] vals=set.toArray();
        for (int i=0; i<vals.length; i++) {
            pstmt.setString(1, vals[i].toString());
            pstmt.addBatch();
        }

        // Execute the batch
        int [] updateCounts = pstmt.executeBatch();
        System.out.append("inserted "+updateCounts.length);