Druid連接數據庫，DBUtils工具類的使用

1.在maven中添加Druid依賴

com.alibaba

druid

1.2.0

2.封裝Druid連接方法

import com.alibaba.druid.pool.DruidDataSource;

import com.alibaba.druid.pool.DruidDataSourceFactory;

import java.io.IOException;

import java.io.InputStream;

import java.sql.Connection;

import java.util.Properties;

public class DruidCon {

private static DruidDataSource dataSource = null;

static {

InputStream is = ClassLoader.getSystemClassLoader().getResourceAsStream("druid.properties");

Properties properties = new Properties();

try {

properties.load(is);

} catch (IOException e) {

e.printStackTrace();

}

try {

dataSource = (DruidDataSource) DruidDataSourceFactory.createDataSource(properties);

} catch (Exception e) {

e.printStackTrace();

}

}

public static Connection getDruidConnection() throws Exception {

Connection con = dataSource.getConnection();

return con;

}

}

3.使用自己寫的工具類進行測試

import com.jdbc.dao.BaseDao;

import com.pyc.dao.Book;

import java.sql.Connection;

import java.util.List;

public class DruidTest01 {

public static void main(String[] args) throws Exception {

//1.連接數據庫池

Connection con = DruidCon.getDruidConnection();

String sql = "select id,bname,price,publishTime from book";

List books = BaseDao.excuteSelectAll(con, Book.class, sql);

books.forEach(System.out::println);

}

}

4.使用apache的DBUtils進行測試

在maven中配置依賴

commons-dbutils

commons-dbutils

1.7

注：QueryRunner對象用來執行sql語句，ResultSetHandler的具體實現類用來存儲結果集數據

ResultSetHandler的實現類：

import com.pyc.dao.Book;

import org.apache.commons.dbutils.DbUtils;

import org.apache.commons.dbutils.QueryRunner;

import org.apache.commons.dbutils.handlers.BeanHandler;

import org.apache.commons.dbutils.handlers.BeanListHandler;

import org.apache.commons.dbutils.handlers.ScalarHandler;

import java.sql.Connection;

import java.sql.SQLException;

import java.util.Date;

import java.util.List;

public class DruidTest02 {

public static void main(String[] args) {

Connection con = null;

try {

//1.獲取數據庫連接

con = DruidCon.getDruidConnection();

//2.創建QueryRunner對象

QueryRunner runner = new QueryRunner();

String sql = "insert into book(bname,price,publishTime) values(?,?,?)";

//3.創建對應ResultSetHandler的實現類

//創建一個BeanHandler用于存儲插入數據，該實現類是存儲自定義對象的

//插入一條數據

BeanHandler beanHandler = new BeanHandler(Book.class);

Book book = runner.insert(con, sql, beanHandler, "演員的自我休養", 39.9, new Date(52213165461L));

System.out.println("成功插入了" + book);

//查詢一條數據

BeanHandler beanHandler2 = new BeanHandler(Book.class);

String sql2 = "select id,bname,price,publishTime from book where id=?";

Book book1 = runner.query(con, sql2, beanHandler2, 20);

System.out.println(book1);

//查詢所有數據

BeanListHandler bookBeanListHandler = new BeanListHandler<>(Book.class);

String sql3 = "select id,bname,price,publishTime from book";

List bookList = runner.query(con, sql3, bookBeanListHandler);

bookList.forEach(System.out::println);

//特殊查詢

ScalarHandler scalarHandler = new ScalarHandler();

String sql4 = "select count(*) from book";

Long bookNum = runner.query(con,sql4, scalarHandler);

System.out.println(bookNum);

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

//5.關閉資源

DbUtils.close(con);

} catch (SQLException e) {

e.printStackTrace();

}

}

}

}

總結

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