有没有办法从预准备语句中检索自动增量ID [英] Is there a way to retrieve the autoincrement ID from a prepared statement

问题描述

当使用带有预准备语句的java查询时，是否有办法从数据库查询中检索自动生成的密钥。

Is there a way to retrieve the auto generated key from a DB query when using a java query with prepared statements.

例如，我知道AutoGeneratedKeys可以如下工作。

For example, I know AutoGeneratedKeys can work as follows.

stmt = conn.createStatement();

stmt.executeUpdate(sql, Statement.RETURN_GENERATED_KEYS);
if(returnLastInsertId) {
    ResultSet rs = stmt.getGeneratedKeys();
    rs.next();
    auto_id = rs.getInt(1);
} 

但是。如果我想使用准备好的Statement进行插入，该怎么办？

However. What if I want to do an insert with a prepared Statement.

String sql = "INSERT INTO table (column1, column2) values(?, ?)";
stmt = conn.prepareStatement(sql);

//this is an error
stmt.executeUpdate(Statement.RETURN_GENERATED_KEYS);
if(returnLastInsertId) {
    //this is an error since the above is an error
    ResultSet rs = stmt.getGeneratedKeys();
    rs.next();
    auto_id = rs.getInt(1);
} 

有没有办法做到这一点，我不知道。从javadoc看来，PreparedStatements无法返回自动生成的ID。

Is there a way to do this that I don't know about. It seems from the javadoc that PreparedStatements can't return the Auto Generated ID.

推荐答案

是的。请参见此处。第7.1.9节。将您的代码更改为：

Yes. See here. Section 7.1.9. Change your code to:

String sql = "INSERT INTO table (column1, column2) values(?, ?)";
stmt = conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);


stmt.executeUpdate();
if(returnLastInsertId) {
   ResultSet rs = stmt.getGeneratedKeys();
    rs.next();
   auto_id = rs.getInt(1);
}

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