下面例子,使用MySQL数据库nextval(‘student’)为自定义函数,用来生成一个key。 <!-- 插入学生 自动主键--> <insert id="insertStudentAutoKey" parameterType="StudentEntity"> <selectKey keyProperty="studentID" resultType="String" order="BEFORE"> select nextval('student') </selectKey> INSERT INTO STUDENT...
//返回 map,key 为 字段名 value为值 public Map<String,Object> getUserByIdReturnMap(Integer id); //返回 map,key 为主键 value为封装后的javaBean @MapKey("id") //告诉 mybatis 哪个字段作为 key public Map<Integer,User> getAllUsersReturnMap(); } <select id="getUserById" resultType="user">...
下面例子,使用MySQL数据库nextval(‘student’)为自定义函数,用来生成一个key。 <!-- 插入学生 自动主键--> <insert id="insertStudentAutoKey" parameterType="StudentEntity"> <selectKey keyProperty="studentID" resultType="String" order="BEFORE"> select nextval('student') </selectKey> INSERT INTO STUDENT...
=results.next();readCount++;try{if(client.delete(null,keyRecord.key))updateCount++;}catch(AerospikeExceptione){log.error("Unexpected exception deleting "+keyRecord.key,e);}}Map<String,Long>map=newHashMap<String,Long>();map.put("read",readCount);map.put("write",updateCount);returnmap;}...
...(在不定义ON DELETE 和ON UPDATE子句时,这是默认设置,也是最安全的设置) ALTER TABLE 表名 ADD CONSTRAINT 外键名 FOREIGN KEY (从表外键) REFERENCES...DELETE FROM product WHERE cid =1; DELETE FROM category WHERE id =1; 三、多对多操作 ...
this.update(tableInfo.newInstance(),Wrappers.<T>update().in(tableInfo.getKeyColumn(),ids)); 212+ returnthis.update(tableInfo.newInstance(),Wrappers.<T>update().in(tableInfo.getKeyColumn(),ids)); 199213 } 200214 Map<String,Object>params=newHashMap<>(); ...
//解析 <selectKey> 节点 insert 和 update 有这个processSelectKeyNodes(id, parameterTypeClass, langDriver);//解析 SQL 语句 Parse the SQL (pre: <selectKey> and <include> were parsed and removed)KeyGenerator keyGenerator;//命名String keyStatementId = id +SelectKeyGenerator.SELECT_KEY_SUFFIX; ...
DeleteBgWorker提供了静态方法getInstance来获取或创建单例,该类提供了start、stop两个方法;start方法会往SCHEDULE注册一个调度任务,每隔PERIOD_MINUTES执行一次,它主要执行deleteRange方法;deleteRange主要是执行RDB.deleteFilesInRange(CFManager.CFH_DEFAULT, beginKey, endKey),它会从MetaService获取seekTimestamp来计算end...
// Rust program to delete all items// from HashSetusestd::collections::HashSet;fnmain() {letmutset:HashSet<i32>=HashSet::new(); set.insert(10); set.insert(20); println!("HashSet items:\n{:?}",set); set.clear(); println!("HashSet items:\n{:?}",set); } ...
HashMap;importjava.util.Map;//java2s.compublicclassMain {publicstaticvoidmain(String[] a) { Map<String,String> map =newHashMap<String,String>(); map.put("key1","value1"); map.put("key2","value2"); map.put("key3","value3"); map.remove("key3"); System.out.println(map); ...