Question

我使用单个insert语句将多行插入表中。该表有一个自动增量字段作为主键。

像这样：INSERT INTO MyTable VALUES (?,?,?,?),(?,?,?,?),(?,?,?,?),(?,?,?,?)

StringJoiner sj = new StringJoiner(",");
for(int i=0;i<salesmen.size();i++)
    sj.add("(?,?,?,?)");

sql.append("INSERT INTO MyTable ");
sql.append("VALUES ");
sql.append(sj.toString());

try(PreparedStatement statement = connection.prepareStatement(sql.toString(),Statement.RETURN_GENERATED_KEYS)){
    int i = 1;
    for(Salesman salesman : salesmen){
        statement.setDate(i++, DateUtil.toSqlDate(date));
        statement.setString(i++, salesman.getName());
        statement.setInt(i++, salesman.getWeeklyTargetCustomerId());
        statement.setInt(i++, salesman.getCycle());
    }
    statement.executeUpdate();

    ResultSet generatedKeys = statement.getGeneratedKeys();
    while(generatedKeys.next()) {
        log.info("generated key: " + generatedKeys.getLong(1)); //only prints 1 id
    }
}
catch(SQLException e){
    log.info("(!!) SQL Exception in Execution: " + e.getMessage());
    log.info("\n\n" + sql.toString() + "\n");
}

当我调用getGeneratedKeys()时，它返回一个ResultSet，其中只插入了最后一行的id，而不是所有行。如果我插入50行，我如何获得50个生成密钥的结果集？

Answer 1

虽然这是一个老问题，但我希望它对某人有所帮助。

PreparedStatement pre = connection.prepareStatement("SQL", PreparedStatement.RETURN_GENERATED_KEYS);
for(Salesman salesman: salesmen) {
    pre.setString(i++, ...);
    pre.setString(i++, ...);
    ....
    pre.addBatch(); // Add this
}
pre.executeBatch(); // Add this
ResultSet rs = pre.getGeneratedKeys();
while(rs.next()) {
    int id = rs.getInt(1); // This should contain the id of the inserts in order.
}

从具有多个值的单个插入语句中获取生成的键

1 个答案: