eclipse连接SQL数据库的增删改查

其实eclipse连接SQL数据库的增删改查与之前发的eclipse连接Mysql数据库的增删改查区别不大，只有一点点地方需要改动，大家可自行发现哈。点击查看eclipse连接Mysql的增删改查
1.在SQL数据库中建表

CREATE TABLE
    Users
    (
        id INT NOT NULL,
        user_name VARCHAR(20) NOT NULL,
        age INT NOT NULL,
        sex INT NOT NULL,
        create_dt DATE NOT NULL,
        PRIMARY KEY (id)
    )

插入数据

Insert into Users values(1,'zhangsan',25,1,'2016-9-9'),
(2,'lisi',23,0,'2016-9-8'),
(3,'wangwu',21,0,'2016-9-7');

查询结果如下：

打开eclipse（已成功连接）
整体结构

定义一个bean类UserVO

package com.test.sql;

import java.util.Date;

public class UserVO {
	private int id;
	private String userName;
	private int age;
	private int sex;
	private Date createDt;

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}
 
	public String getUserName() {
		return userName;
	}

	public void setUserName(String userName) {
		this.userName = userName;
	}
	
	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public int getSex() {
		return sex;
	}

	public void setSex(int sex) {
		this.sex = sex;
	}

	public Date getCreateDt() {
		return createDt;
	}

	public void setCreateDt(Date createDt) {
		this.createDt = createDt;
	}
	@Override
	public String toString() {
		return "UserVO [id=" + id + ", userName=" + userName + ", age=" + age
				+ ", sex=" + sex + ", createDt=" + createDt + "]";
	}
}

改造Util类，用于获取数据库连接

package com.test.sql;


import java.sql.Connection;

import java.sql.DriverManager;


public class DBUtil {
	private static final String URI = "jdbc:sqlserver://127.0.0.1:1433;DatabaseName=test";
	private static final String userName="sa";//你的数据库用户名
	private static final String userPwd="123";//你的密码
	private static final String DRIVER = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
	public static Connection connectDB() throws Exception {
		//1、加载数据库驱动
		Class.forName(DRIVER);
		//2、获取数据库连接
		Connection conn = DriverManager.getConnection(URI,userName,userPwd);
		return conn;
	}
}

准备工作完成后，定义一个UserDao类，用于操作数据库的增删改查
1.查询全部

package com.test.sql;

import java.sql.Connection;
import java.sql.Date;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;


public class UserDao {

	public List<UserVO> queryAll() throws Exception {
		Connection conn = DBUtil.connectDB();
		String sql = "SELECT * FROM users";
		List<UserVO> userList = new ArrayList<UserVO>();
		Statement stmt = conn.createStatement();
		ResultSet rs = stmt.executeQuery(sql);

		while(rs.next()) {
			UserVO user = new UserVO();
			user.setId(rs.getInt("id"));
			user.setUserName(rs.getString("user_name"));
			user.setAge(rs.getInt("age"));
			user.setSex(rs.getInt("sex"));
			user.setCreateDt(rs.getDate("create_dt"));
			userList.add(user);
		}
		return userList;
	}
	

	public static void main(String[] args) {
		UserDao dao = new UserDao();

		try {
			List<UserVO> userList = dao.queryAll();
			for(UserVO user : userList) {
				System.out.println(user);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
}

查询结果：

2.条件查询

package com.test.sql;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class UserDao {

	public List<UserVO> queryByParams(List<Map<String, Object>> params) throws Exception {
		Connection conn = DBUtil.connectDB();
		StringBuilder sql = new StringBuilder("SELECT * FROM Users WHERE 1=1 ");

		for(Map<String, Object> param : params) {
			sql.append(" and ");
			sql.append(" " + param.get("col") + " ");
			sql.append(" " + param.get("rel") + " ");
			sql.append(" " + param.get("value") + " ");
		}
		System.out.println(sql.toString());
		List<UserVO> userList = new ArrayList<UserVO>();
		Statement stmt = conn.createStatement();
		ResultSet rs = stmt.executeQuery(sql.toString());
		while(rs.next()) {
			UserVO user = new UserVO();
			user.setId(rs.getInt("id"));
			user.setUserName(rs.getString("user_name"));
			user.setAge(rs.getInt("age"));
			user.setSex(rs.getInt("sex"));
			user.setCreateDt(rs.getDate("create_dt"));
			userList.add(user);
		}
		return userList;
	}

	public static void main(String[] args) {
		UserDao dao = new UserDao();

		List<Map<String, Object>> params = new ArrayList<Map<String,Object>>();
		Map<String, Object> param1 = new HashMap<String, Object>();
		param1.put("col", "user_name");
		param1.put("rel", "like");
		param1.put("value", "'%ang%'");
		params.add(param1);

		Map<String, Object> param2 = new HashMap<String, Object>();
		param2.put("col", "sex");
		param2.put("rel", "=");
		param2.put("value", 1);
		params.add(param2);
		try {
			List<UserVO> userList = dao.queryByParams(params);
			for(UserVO user : userList) {
				System.out.println(user);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

查询结果：

3.插入数据

package com.test.sql;

import java.sql.Connection;
import java.sql.Date;
import java.sql.PreparedStatement;


public class UserDao {
	public void addUser(UserVO user) throws Exception {
		Connection conn = DBUtil.connectDB();
		String sql = "INSERT INTO Users(id,user_name, age, sex, create_dt) "
				+ " VALUES(?,?, ?, ?,?)";

		PreparedStatement pstmt = conn.prepareStatement(sql);
		pstmt.setInt(1, user.getId());
		pstmt.setString(2, user.getUserName());
		pstmt.setInt(3, user.getAge());
		pstmt.setInt(4, user.getSex());
		pstmt.setDate(5, new Date(new java.util.Date().getTime()));
		pstmt.execute();
	}
		public static void main(String[] args) {
			UserDao dao = new UserDao();
			UserVO user = new UserVO();
			user.setId(4);
			user.setUserName("zhaosi");
			user.setAge(20);
			user.setSex(1);
			
			try {
				dao.addUser(user);
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
}

插入结果：

4.删除数据

package com.test.sql;

import java.sql.Connection;
import java.sql.PreparedStatement;


public class UserDao {
	public void deleteUser(int id) throws Exception {
		Connection conn = DBUtil.connectDB();
		String sql = "DELETE FROM Users WHERE id = ?";
		PreparedStatement pstmt = conn.prepareStatement(sql);
		pstmt.setInt(1, id);
		pstmt.execute();
	}

	public static void main(String[] args) {
		UserDao dao = new UserDao();
		try {
			dao.deleteUser(1);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

查询结果：

5.更新数据库

package com.test.sql;

import java.sql.Connection;
import java.sql.PreparedStatement;


public class UserDao {

	public void updateUser(UserVO user) throws Exception {
		Connection conn = DBUtil.connectDB();
		String sql = "UPDATE Users SET user_name=?, age=?, sex=?"
				+ " WHERE id=?";

		PreparedStatement pstmt = conn.prepareStatement(sql);
		pstmt.setString(1, user.getUserName());
		pstmt.setInt(2, user.getAge());
		pstmt.setInt(3, user.getSex());
		pstmt.setInt(4, user.getId());
		pstmt.executeUpdate();
	}

	public static void main(String[] args) {
		UserDao dao = new UserDao();
		UserVO user = new UserVO();

		user.setUserName("zhaoliu");
		user.setAge(21);
		user.setSex(0);
		user.setId(4);
		try {
			dao.updateUser(user);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

更新结果：

学习中，欢迎交流