simple-jdbc-demo

package com.example.simplejdbcdemo;

import com.example.simplejdbcdemo.dao.BatchFooDao;
import com.example.simplejdbcdemo.dao.FooDao;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.jdbc.core.simple.SimpleJdbcInsert;

import javax.sql.DataSource;

/**
 * 通过注解定义Bean
 * @Component
 * @Repository
 * @Service
 * @Controller
 * @RestController
 *
 * SQL批处理
 * JdbcTemplate
 * -batchUpdate
 * -BatchPreparedStatementSetter
 * NamedParameterJdbcTemplate
 * -batchUpdate
 * -SqlParameterSourceUtils.createBatch
 */
@SpringBootApplication
@Slf4j
public class SimpleJdbcDemoApplication implements CommandLineRunner {
    @Autowired
    private FooDao fooDao;
    @Autowired
    private BatchFooDao batchFooDao;

    public static void main(String[] args) {
        SpringApplication.run(SimpleJdbcDemoApplication.class, args);
    }

    @Bean
    @Autowired
    public SimpleJdbcInsert simpleJdbcInsert(JdbcTemplate jdbcTemplate){
        return new SimpleJdbcInsert(jdbcTemplate)
                .withTableName("FOO").usingGeneratedKeyColumns("ID");
    }

    @Bean
    @Autowired
    public NamedParameterJdbcTemplate namedParameterJdbcTemplate(DataSource dataSource){
        return new NamedParameterJdbcTemplate(dataSource);
    }

    @Override
    public void run(String... args) throws Exception {
        //单个
//        fooDao.insertData();
        //批量
        batchFooDao.batchInsert();
        fooDao.listData();
    }
}

package com.example.simplejdbcdemo.bean;

import lombok.Builder;
import lombok.Data;

@Data
@Builder
public class Foo {
    private Long id;
    private String bar;
}

package com.example.simplejdbcdemo.dao;

import com.example.simplejdbcdemo.bean.Foo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BatchPreparedStatementSetter;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.jdbc.core.namedparam.SqlParameterSourceUtils;
import org.springframework.stereotype.Repository;

import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

/**
 * 批处理
 */
@Repository
public class BatchFooDao {
    @Autowired
    private JdbcTemplate jdbcTemplate;
    @Autowired
    private NamedParameterJdbcTemplate namedParameterJdbcTemplate;

    public void batchInsert(){
        //batch insert 方法1
        jdbcTemplate.batchUpdate("INSERT INTO FOO(BAR) VALUES (?)",
                new BatchPreparedStatementSetter() {
                    @Override
                    public void setValues(PreparedStatement ps, int i) throws SQLException {
                        ps.setString(1,"b-"+i);
                    }

                    @Override
                    public int getBatchSize() {
                        return 2;
                    }
                });

        //batch insert 方法2
        List<Foo> list = new ArrayList<>();
        list.add(Foo.builder().id(100L).bar("b-100").build());
        list.add(Foo.builder().id(101L).bar("b-101").build());
        namedParameterJdbcTemplate
                .batchUpdate("INSERT INTO FOO (ID,BAR) VALUES (:id,:bar)",
                        SqlParameterSourceUtils.createBatch(list));
    }
}

package com.example.simplejdbcdemo.dao;
import com.example.simplejdbcdemo.bean.Foo;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.simple.SimpleJdbcInsert;
import org.springframework.stereotype.Repository;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;

@Slf4j
@Repository
public class FooDao {
    @Autowired
    private JdbcTemplate jdbcTemplate;
    @Autowired
    private SimpleJdbcInsert simpleJdbcInsert;

    public void insertData(){
        Arrays.asList("b","c").forEach(bar->{
            jdbcTemplate.update("INSERT INTO FOO(BAR) VALUES (?)",bar);
        });

        HashMap<String,String> row = new HashMap<>();
        row.put("BAR","d");
        Number id = simpleJdbcInsert.executeAndReturnKey(row);
        log.info("ID of d: {}",id.longValue());
    }

    public void listData(){
        log.info("Count: {}",
                jdbcTemplate.queryForObject("SELECT COUNT(*) FROM FOO",Long.class));

        List<String> list = jdbcTemplate.queryForList("SELECT BAR FROM FOO", String.class);
        list.forEach(s->log.info("Bar: {}",s));

        jdbcTemplate.query("SELECT * FROM FOO", new RowMapper<Foo>() {
            @Override
            public Foo mapRow(ResultSet rs,int rowNum)throws SQLException {
                return Foo.builder()
                        .id(rs.getLong(1))
                        .bar(rs.getString(2))
                        .build();
            }
        });

    }
}

properties

spring.output.ansi.enabled=ALWAYS

data.sql

INSERT INTO FOO (BAR) VALUES ('aaa');

schema.sql

CREATE TABLE FOO (ID INT IDENTITY, BAR VARCHAR(64));

原文地址：https://www.cnblogs.com/ukzq/p/13285560.html