我正在使用Java(jdbc)与MySQL数据库进行交互。我有一个主要索引的表是AUTO INCREMENT。当我插入一行时,我需要获得它刚收到的索引。我该怎么做?
答案 0 :(得分:7)
stmt.executeUpdate(
"INSERT INTO autoIncTutorial (dataField) "
+ "values ('Can I Get the Auto Increment Field?')",
Statement.RETURN_GENERATED_KEYS);
//
// Example of using Statement.getGeneratedKeys()
// to retrieve the value of an auto-increment
// value
//
int autoIncKeyFromApi = -1;
rs = stmt.getGeneratedKeys();
if (rs.next()) {
autoIncKeyFromApi = rs.getInt(1);
} else {
// throw an exception from here
}
rs.close();
rs = null;
答案 1 :(得分:2)
感谢John Boker的出色回应。
如果您希望使用 PreparedStatement ,您仍然可以使用RETURN_GENERATED_KEYS
,但必须采用不同的方式应用命令:
PreparedStatement ps = mysql.prepareStatement(
"INSERT INTO myTable (colA, colB, colC) VALUES (?, ?, ?)",
Statement.RETURN_GENERATED_KEYS );
ps.setString(1, "My text");
ps.setTimestamp(2, new java.sql.Timestamp(new java.util.Date().getTime()););
ps.setInt(3, 5150);
ps.executeUpdate();
ResultSet results = ps.getGeneratedKeys();
results.next(); // Assume just one auto-generated key; otherwise, use a while loop here
System.out.println(results.getInt(1)); // there should only be 1 column in your results: the value of the auto-generated key
RETURN_GENERATED_KEYS
中添加prepareStatement()
参数
功能statement.executeUpdate()
获取结果,而是从中获取结果
statement.getGeneratedKeys()
。答案 2 :(得分:0)
或者,使用Spring JDBC看起来像:
Map<String, Object> map = new HashMap<String, Object>();
map.put("column1", "test");
map.put("column2", Boolean.TRUE);
SimpleJdbcInsert insert = new SimpleJdbcInsert(template).withTableName("table").usingGeneratedKeyColumns("id");
int id = insert.executeAndReturnKey(map).intValue();