Java-总结Spring中实现数据库连接几种方式

一.QueryRunner

1.Package

import org.apache.commons.dbutils.QueryRunner;

2.Maven-pom.xml

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.0.10.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.18</version>
        </dependency>
        <dependency>
            <groupId>commons-dbutils</groupId>
            <artifactId>commons-dbutils</artifactId>
            <version>1.7</version>
        </dependency>
        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.1</version>
        </dependency>
        <dependency>

3.Code

package config;

import com.mchange.v2.c3p0.ComboPooledDataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import javax.sql.DataSource;
import java.beans.PropertyVetoException;
import java.io.Serializable;

@Configuration("jdbc_config")
@ComponentScan("com.study")
//标记：注册类路径下的properties文件
@PropertySource("classpath:db.properties")
public class JdbcConfig implements Serializable {

    @Value("${jdbc.driver}")
    private String driver;
    @Value("${jdbc.url}")
    private String url;
    @Value("${jdbc.username}")
    private String username;
    @Value("${jdbc.password}")
    private String password;

    @Bean("ds")
    public DataSource createDataSource() {
        try {
            ComboPooledDataSource comboPooledDataSource = new ComboPooledDataSource();
            comboPooledDataSource.setDriverClass(driver);
            comboPooledDataSource.setJdbcUrl(url);
            comboPooledDataSource.setUser(username);
            comboPooledDataSource.setPassword(password);
            return comboPooledDataSource;
        } catch (PropertyVetoException e) {
            e.printStackTrace();
        }
        return null;
    }
}

/**
 * 数据持久层
 */
@Repository("tuser_imp")
public class TUserImp implements ITUser {

    //注入
    @Resource(name = "query_runner")
    private QueryRunner runner;

    public List<TUser> getAll() {
        try {
            System.out.println("TUserImp-getAll方法执行了。。。");
            String sql = "select * from t_user";
            return runner.query(sql, new BeanListHandler<TUser>(TUser.class));
            //return (List<TUser>) DbUtil.executeQuery(sql, new ListResultHandler(TUser.class), null);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }

    public Integer update(TUser user) {
        try {
            String sql = "update t_user set t_name= '" + user.getT_name() + "'  where t_id=" + user.getT_id() + "";
            return runner.update(sql, null);
            //return DbUtil.executeUpdate(sql);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }
}

二.JdbcTemplate

1.Package

import org.springframework.jdbc.core.JdbcTemplate;

2.Maven-pom.xml

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.0.10.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>5.2.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.18</version>
        </dependency>
       

3.Code

package com.config;

import com.mysql.cj.jdbc.MysqlDataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.*;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DriverManagerDataSource;


@Configuration("jdbctemplate_config")
@ComponentScan("com")
@PropertySource("classpath:db.properties")
public class JdbcTemplateConfig {

    @Value("${jdbc.driver}")
    private String driver;
    @Value("${jdbc.url}")
    private String url;
    @Value("${jdbc.username}")
    private String username;
    @Value("${jdbc.password}")
    private String password;

    @Bean("jdbc_template")
    @Scope("prototype")
    public JdbcTemplate createJdbcTemplate() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName(driver);
        dataSource.setUrl(url);
        dataSource.setUsername(username);
        dataSource.setPassword(password);
        JdbcTemplate jdbcTemplate = new JdbcTemplate();
        jdbcTemplate.setDataSource(dataSource);
        return  jdbcTemplate;
    }

}

/**
 * 数据持久层
 */
@Repository("tuser_imp")
public class TUserImp implements ITUser {

    @Resource(name = "jdbc_template")
    private JdbcTemplate jdbcTemplate;

    public List<TUser> getAll() {
        String sql = "select * from t_user";
        return jdbcTemplate.query(sql, new BeanPropertyRowMapper(TUser.class), null);
    }

    public TUser getRow(Integer id) {
        String sql = "select * from t_user where t_id=?";
        return jdbcTemplate.query(sql, new BeanPropertyRowMapper(TUser.class), id).isEmpty() ? null : (TUser) jdbcTemplate.query(sql, new BeanPropertyRowMapper(TUser.class), id).get(0);
    }

    public Integer update(TUser user) {
        String sql = "update t_user set t_name=? where t_id=? ";
        return jdbcTemplate.update(sql, user.getT_name(), user.getT_id());
    }
}