springBoot使用JdbcTemplate

如果是通过spring自动注入的jdbcTemplate，配好application.properties在其他类中就能在其他类中直接使用。

如果通过new JdbcTemplate()出来的就需要自己配置DataSource。

自动注入如下

application.properties文件

spring.datasource.url=jdbc:mysql://localhost:3306/test?serverTimezone=UTCspring.datasource.username=rootspring.datasource.password=rootspring.datasource.driver-class-name=com.mysql.jdbc.Driverspring.datasource.type=com.alibaba.druid.pool.DruidDataSourceC3P0Adapter

UserDao

package com.example.demo.dao;import com.example.demo.pojo.UserInfo;import org.springframework.jdbc.core.JdbcTemplate;import org.springframework.jdbc.core.PreparedStatementCreator;import org.springframework.jdbc.core.RowMapper;import org.springframework.jdbc.support.GeneratedKeyHolder;import org.springframework.jdbc.support.KeyHolder;import org.springframework.stereotype.Repository;import javax.annotation.Resource;import java.sql.*;import java.util.ArrayList;import java.util.List;@Repositorypublic class UserDao {  @Resource  private JdbcTemplate jdbcTemplate;  public UserInfo createUser(UserInfo u) {    String sql = "insert into user(name,address) values(?,?)";    KeyHolder holder=new GeneratedKeyHolder();    jdbcTemplate.update(new PreparedStatementCreator() {      public PreparedStatement createPreparedStatement(Connection conn) throws SQLException {        PreparedStatement ps=conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);        ps.setString(1, u.getName());        ps.setString(2, u.getAddress());        return ps;      }    }, holder);    int insertId=holder.getKey().intValue();    u.setId(insertId);    return u;  }  public void createUserList() {    String sql="insert into user (name,address) values (?,?)";    List batchArgs=new ArrayList();    batchArgs.add(new Object[]{"caoyc","北京"});    batchArgs.add(new Object[]{"zhh","重庆"});    batchArgs.add(new Object[]{"cjx","天津"});    jdbcTemplate.batchUpdate(sql, batchArgs);  }  public void deleteUser(int id) {    String sql="delete from user where id=?";    jdbcTemplate.update(sql, new Object[] {id},new int[] {java.sql.Types.INTEGER});  }  public void updateUser(UserInfo u) {    String sql="update user set name=? where id=?";    jdbcTemplate.update(sql, new Object[] {u.getName(),u.getId()});  }  public List queryUser(int id) {    String sql="select * from user where id=?";    // RowMapper rowMapper = new BeanPropertyRowMapper<>(UserInfo.class);    return jdbcTemplate.query(sql,new Object[] {id},new UserRowMapper());  }  class UserRowMapper implements RowMapper {    public UserInfo mapRow(ResultSet res, int arg1) throws SQLException {      UserInfo u=new UserInfo();      u.setId(res.getInt("id"));      u.setName(res.getString("name"));      u.setAddress(res.getString("address"));      return u;    }  }}

手动配置如下

DriverManagerDataSource dataSource=new DriverManagerDataSource();dataSource.setDriverClassName("org.postgresql.Driver");dataSource.setUrl("jdbc:postgresql://127.0.0.1:5432/postgres");dataSource.setUsername("postgres");dataSource.setPassword("332578");JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);