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摘要： class Singleton { private static class SingletonInstance { private static final Singleton INSTANCE = new Singleton(); } private Singleton() { } public 阅读全文

摘要： class Singleton { private static volatile Singleton instance; private Singleton() { } public static Singleton getInstance() { if (instance == null) { 阅读全文

摘要： 线程不安全 class Singleton { private Singleton() { } private static Singleton instance; public static Singleton getInstance() { if (instance == null) { ins 阅读全文

摘要： 静态变量 class Singleton { private static final Singleton instance = new Singleton(); private Singleton() { } public static Singleton getInstance() { retu 阅读全文

摘要： <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance 阅读全文

摘要： @Override public void insert(Customer cust) { String sql = "insert into customers(name,email,birth)values(?,?,?)"; Object[] args = {cust.getName(),cus 阅读全文

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摘要： @Override public Long getCount() { String sql = "select count(*) from customers"; Integer count = jdbcTemplate.queryForObject(sql, Integer.class); ret 阅读全文

摘要： protected int update(final PreparedStatementCreator psc, @Nullable final PreparedStatementSetter pss) { return execute(psc, ps -> { pss.setValues(ps); 阅读全文

摘要： /* * commons-dbutils 是 Apache 组织提供的一个开源 JDBC工具类库,封装了针对于数据库的增删改查操作 * */ public class QueryRunnerTest { //测试插入 @Test public void testInsert() { Connecti 阅读全文