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=UTC spring.datasource.username=root spring.datasource.password=root spring.datasource.driver-class-name=com.mysql.jdbc.Driver spring.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;
@Repository
public 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<Object[]> batchArgs=new ArrayList<Object[]>();
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<UserInfo> queryUser(int id) {
String sql="select * from user where id=?";
// RowMapper<UserInfo> rowMapper = new BeanPropertyRowMapper<>(UserInfo.class);
return jdbcTemplate.query(sql,new Object[] {id},new UserRowMapper());
}
class UserRowMapper implements RowMapper<UserInfo> {
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);
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。
