jdbctemplate

I'm trying to find the faster way to do batch insert . I tried to insert several batches with jdbcTemplate.update(String sql) , where sql was builded by StringBuilder and looks like: INSERT INTO TABLE(x, y, i) VALUES(1,2,3), (1,2,3), ... , (1,2,3) Batch size was exactly 1000. I inserted nearly 100 batches. I checked the time using StopWatch and found out insert time: min[38ms], avg[50ms], max[190ms] per batch I was glad but I wanted to make my code better. After that, I tried to use jdbcTemplate.batchUpdate in way like: jdbcTemplate.batchUpdate(sql, new BatchPreparedStatementSetter() {

Given the following example POJO's: (Assume Getters and Setters for all properties) class User { String user_name; String display_name; } class Message { String title; String question; User user; } One can easily query a database (postgres in my case) and populate a list of Message classes using a BeanPropertyRowMapper where the db field matched the property in the POJO: (Assume the DB tables have corresponding fields to the POJO properties). NamedParameterDatbase.query("SELECT * FROM message", new BeanPropertyRowMapper(Message.class)); I'm wondering - is there a convenient way to construct a

dbcBaseDao接口，内容如下： package com.sun4j.core.jdbc.dao; import java.io.Serializable; import java.util.List; import java.util.Map; import org.springframework.jdbc.core.JdbcTemplate; import org.springframework.jdbc.support.rowset.SqlRowSet; public interface JdbcBaseDao<T> { void save(T entity); void update(T entity); void delete(T entity); void delete(Serializable id); void deleteAll(); T findById(Serializable id); List<T> findAll(); void batchDelete(Serializable[] ids); void batchUpdate(List<T> list); void batchSave(List<T> list); Map<String, Object> findOne(String sql, Object... args); List<Map

jdbc： jdbc是Java提供的原生态接口，操作数据库的唯一技术 缺点:重复写代码，代码写死，耦合性高，开发效率低换数据库比较苦难 优点:运行速度最快，所有操作数据库的技术底层都是jdbc写的 jpa： 　　java persistence api 持久规范，他是ORM对象关系型数据库映射的规范，不用写sql语句，面向对象的 　　优点：数据库移植快，一级二级缓存，查询，提高性能（ ehcache 框架实现缓存 ） 　　缺点：查询所有的时候，find性能无法控制，无法干预sql语句的生成，对sql语句要求高的话， 　　 jpa是为了让面向对象设置的，为了不写sql语句而设置的（几十张表写sql语句关联，那种才是高手，本人三张表的sql语句就很头疼） 　　 　　spring jdbc jdbcTemplate模板数据库简化对数据库的操作，他是sping提供的 　　spring data jpa 是对jpa规范的再次抽象，底层还是用的实现jpa的hibernate技术（ entitymanager ）。 　　hibernate 是一个标准的orm框架，实现jpa接口（好像是 session ）。 　　mybatis 也是一个持久化框架，但 不完全是一个orm框架，不是依照的jpa规范，她需要些sql语句，半ORM 。 来源： https://www.cnblogs.com

package cn.itcast.datasource.jdbctemplate;import cn.itcast.domain.User;import cn.itcast.utils.JDBCUtils;import org.junit.Test;import org.springframework.jdbc.core.BeanPropertyRowMapper;import org.springframework.jdbc.core.JdbcTemplate;import org.springframework.jdbc.core.RowMapper;import java.sql.ResultSet;import java.sql.SQLException;import java.util.List;import java.util.Map;/** * @author newcityman * @date 2019/8/17 - 21:05 */public class JdbcTemplateDemo02 { /* * 根据id号，修改user对象 * */ // 获取JdbcTemplate对象 private JdbcTemplate temp = new JdbcTemplate(JDBCUtils.getDataSource()); @Test public

一、Spring对不同的持久化支持 Spring为各种支持的持久化技术，都提供了简单操作的模板和回调 ORM持久化技术 模板类 JDBC org.springframework.jdbc.core.JdbcTemplate Hibernate5.0 org.springframework.orm.hibernate5.HibernateTemplate IBatis(MyBatis) org.springframework.orm.ibatis.SqlMapClientTemplate JPA org.springfrmaework.orm.jpa.JpaTemplate 其实Spring的JDBCTemplate有点像DBUtils，但是有时候还没有DBUitls好用。下面我们就来学习一下使用SpringJDBCTemplate来玩一下CRUD。 二、实现jdbcTemlate的CRDU 1.引入依赖： <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM

This is my first experience with JDBCTemplates and I ran into a case where I need to use a query that looks like this: SELECT * FROM table WHERE field IN (?) How do I do that? I already tried passing a list/array value but that didn't do the trick, I get an exception. My current code looks like this: Long id = getJdbcTemplate().queryForLong(query, new Object[]{fieldIds}); Spring Documentation states that there is no way of doing this besides generating the required number of "?" placeholders to match the size of the parameter List. Is there a workaround? I don't think you can do this as a