6
我正在玩JDBC/MySQL 5.1。我創建了一個insert
查詢來將一些數據插入到表中,並希望從新創建的行中返回生成的密鑰。但是,當我通過「id」(這是我的PK和自動增量列)引用列時。getGeneratedKeys()爲什麼返回「GENERATED_KEY」作爲列名?
PreparedStatement ps = St0rm.getInstance().getDatabase("main")
.prepare("INSERT INTO quests (name,minlevel,start_npc,end_npc) VALUES(?,?,?,?)", true); // creates a prepared statement with flag RETURN_GENERATED_KEYS
// ...
int affected = ps.executeUpdate();
ResultSet keys = ps.getGeneratedKeys();
if (affected > 0 && keys.next()) {
St0rm.getInstance().getLogger().warning(String.format("ID Column Name: %s", keys.getMetaData().getColumnName(1))); // says the column name is: GENERATED_KEY
q = new Quest(keys.getInt(1)); // column index from the generated key, no error thrown.
q = new Quest(keys.getInt("id")); // actual column name, line throws a SQLException
// ...
}
所以,我的問題:爲什麼ResultSet.getGeneratedKeys
使用GENERATED_KEY
作爲列名?