在插入操作完成后,MyBatis会调用GeneratedKeyHolder的setKeys()方法,将自动生成的主键值设置到value属性中。 最后,当需要获取自动生成的主键值时,可以通过调用GeneratedKeyHolder的getValue()方法获取。 总的来说,GeneratedKeyHolder的实现原理是利用MyBatis与数据库的交互获取自动生成的主键值,并存储在一个Java对象中以...
int update(PreparedStatementCreator psc, KeyHolder generatedKeyHolder) Spring为KeyHolder接口指代了一个通用的实现类GeneratedKeyHolder,该类返回新增记录时的自增长主键值。假设我们希望在新增论坛板块对象后,希望将主键值加载到对象中,则可以按以下代码进行调整: 1publicRole createRole(finalRole Role) {2finalString sq...
Spring利用GeneratedKeyHolder,提供了一个可以返回新增记录对应主键值的方法: int update(PreparedStatementCreator psc, KeyHolder generatedKeyHolder)。 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 public Permission createPermission(final Permission permission) { final String sql = "insert into ...
int update(PreparedStatementCreator psc, KeyHolder generatedKeyHolder) Spring为KeyHolder接口指代了一个通用的实现类GeneratedKeyHolder,该类返回新增记录时的自增长主键值。假设我们希望在新增论坛板块对象后,希望将主键值加载到对象中,则可以按以下代码进行调整: final String INSERT_SQL = "insert into refresh_request(...
方法1，当我说注入键时，我实际上指的是注入一个KeyFactory。这意味着您可以在测试中控制结果。例如：...
Spring Boot GeneratedKeyHolder example In the following example we use theGeneratedKeyHolderto retrieve the Id of the created user. In a typical scenario, the applicaiton returns the object that was created back to the user. build.gradle
ID, col1, col2)"+"VALUES(TABLE.TABLE_SEQ.NEXTVAL, :param1, :param2)",parameters,keyHolder,...
jdbcTemplate.update(creator, keyHolder); return keyHolder.getKey().longValue(); } 数据库是 mysql. 执行的时候大部分情况都是正确的,但是老是会不定时的爆出 : The getKey method should only be used when a single key is returned. The current key entry contains multiple keys : [{GENERATED_KEY=...
ON DUPLICATE KEY UPDATE id = last_insert_id(id), dynamic_val = VALUES(dynamic_val)"; public long upsert() { KeyHolder key = new GeneratedKeyHolder(); jdbcTemplate.update(con -> { final PreparedStatement ps = con.prepareStatement(SQL, Statement.RETURN_GENERATED_KEYS); ps.setObject("fixed1...
Closed GeneratedKeyHolder.getKey returns NULL with postgres [SPR-7564] #12221 spring-projects-issues opened this issue Sep 17, 2010· 6 comments Comments Collaborator spring-projects-issues commented Sep 17, 2010 Adrian opened SPR-7564 and commented On the forum there is thread that this ...