简单的用c3p0和dbutils实现的数据库增删查改

简单的用c3p0和dbutils实现的数据库增删查改

JdbcUtils.java

import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class JdbcUtils {
	public QueryRunner runner = new QueryRunner(new ComboPooledDataSource());
	

	// 查询所有数据
	public ArrayList queryAll() {

		ArrayList list = null;
		
		String sql = "select * from student";
		try {
			
			//查询所有数据,并将数据存入集合中
			list = (ArrayList) runner.query(sql, new BeanListHandler(Student.class));

		} catch (SQLException e) {

			e.printStackTrace();
		}
		return list;
	}
//按学号查询数据 返回student对象
	public Student queryById() {
		Student queryResult = null;
		
		String sql = "select * from student where stuId=?";
		try {
			queryResult = runner.query(sql, new BeanHandler(Student.class), "20170831005");
		} catch (SQLException e) {

			e.printStackTrace();
		}
		return queryResult;
	}

	//更新数据
	public void update(int math,String stuId){
		String sql="update student set math=? where stuId=?";
		try {
			int rows = runner.update(sql, math,stuId);
			if(rows>0){
				System.out.println("更新成功");
			}
		} catch (SQLException e) {
			
			e.printStackTrace();
		}
	}
	//插入数据
	public void insert(String stuId,String stuName,String stuSex,int chinese,int math,int english,int classId){
		String  sql="insert into student values(?,?,?,?,?,?,?)";
		
		try {
			int rows = runner.update(sql,stuId,stuName,stuSex,chinese,math,english,classId);
			if (rows>0) {
				System.out.println("插入成功");
				
			}
		} catch (SQLException e) {
			
			e.printStackTrace();
		}
	}
}

Student.java

public class Student {
	private String stuId;
	private String stuName;
	private String stuSex;
	private int chinese;
	private int math;
	private int english;
	private int classId;

	public String getStuId() {
		return stuId;
	}

	public void setStuId(String stuId) {
		this.stuId = stuId;
	}

	public String getStuName() {
		return stuName;
	}

	public void setStuName(String stuName) {
		this.stuName = stuName;
	}

	public String getStuSex() {
		return stuSex;
	}

	public void setStuSex(String stuSex) {
		this.stuSex = stuSex;
	}

	public int getChinese() {
		return chinese;
	}

	public void setChinese(int chinese) {
		this.chinese = chinese;
	}

	public int getMath() {
		return math;
	}

	public void setMath(int math) {
		this.math = math;
	}

	public int getEnglish() {
		return english;
	}

	public void setEnglish(int english) {
		this.english = english;
	}

	public int getClassId() {
		return classId;
	}

	public void setClassId(int classId) {
		this.classId = classId;
	}

	@Override
	public String toString() {
		return "Student [stuId=" + stuId + ", stuName=" + stuName + ", stuSex=" + stuSex + ", chinese=" + chinese
				+ ", math=" + math + ", english=" + english + ", classId=" + classId + "]";
	}

}

Student.sql

CREATE TABLE `student` (
  `stuId` varchar(11) NOT NULL,
  `stuName` varchar(8) NOT NULL,
  `stuSex` varchar(2) NOT NULL,
  `chinese` int(3) DEFAULT NULL,
  `math` int(3) DEFAULT NULL,
  `english` int(3) DEFAULT NULL,
  `classId` int(11) NOT NULL
)