有没有办法从准备好的语句中检索自动增量 ID [英] Is there a way to retrieve the autoincrement ID from a prepared statement
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问题描述
在使用带有准备语句的 java 查询时,有没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 可以按如下方式工作.
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);
}
不过.如果我想用准备好的语句插入怎么办.
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);
}
有没有我不知道的方法可以做到这一点.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.请参阅此处.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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