JDBC增删改查 && 查询一定日期范围的数据_妙先森的博客

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import java . sql . Connection ; import java . sql . DriverManager ; import java . sql . PreparedStatement ; import java . sql . SQLException ; import java . sql . Statement ; * 利用PreparedStatement进行增删改数据 * @author 2Π public class Demo03 { public static void main ( String [ ] args ) { Connection conn = null ; PreparedStatement ps = null ; try { //加载驱动类 Class . forName ( "com.mysql.jdbc.Driver" ) ; //建立连接(连接对象内部实质是包含了Scoket对象，是一个远程连接。比较耗时！这是Connection的缺点) //实际开发中，使用连接池来提高效率。 conn = ( Connection ) DriverManager . getConnection ( "jdbc:mysql://localhost:3306/testjdbc" , "root" , "000000" ) ; String addStr = "insert into tb_user (uName,uPwd,reTime) values (?,?,?)" ; //？占位符 ps = conn . prepareStatement ( addStr ) ; //用setObject方法来处理参数、也可用set（对应数据类型） ps . setObject ( 1 , "张三" ) ; ps . setObject ( 2 , "000000" ) ; ps . setObject ( 3 , new java . sql . Date ( System . currentTimeMillis ( ) ) ) ; if ( ps . executeUpdate ( ) > 0 ) { System . out . println ( "插入成功！" ) ; } catch ( ClassNotFoundException e ) { e . printStackTrace ( ) ; } catch ( SQLException e ) { e . printStackTrace ( ) ; } finally { if ( ps != null ) { try { ps . close ( ) ; } catch ( SQLException e ) { // TODO Auto-generated catch block e . printStackTrace ( ) ; if ( conn != null ) { try { ps . close ( ) ; } catch ( SQLException e ) { // TODO Auto-generated catch block e . printStackTrace ( ) ;

这里举的是插入即添加数据的例子，更新与删除只要改下sql语句就行。

比如将刚刚插入的数据读出来。

package com.yzx.JDBC01;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
   * 查询数据库中的结果并打印至控制台
 * @author 2Π
public class Demo04 {
	public static void main(String[] args){
		//创建连接对象
		Connection conn =null;
		//创建准备做事的对象
		PreparedStatement ps =null;
		//接收返回的查询结果
		ResultSet rs =null;
		//加载驱动类
		try {
			Class.forName("com.mysql.jdbc.Driver");
			conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/testjdbc","root","000000");
			//sql语句
			String sqlStr = "select * from tb_user where uName=?";
			ps = conn.prepareStatement(sqlStr);
			ps.setString(1, "张三");
			//executeQuery()返回查询记录
			rs = ps.executeQuery();		
			System.out.println("id\t姓名\t密码\t");
			while (rs.next()/*.next()指向下一条查询结果、有返回true，没有返回false*/) {
				System.out.println(rs.getInt(1)+"\t"+rs.getString(2)+"\t"+rs.getString(3));
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}catch (SQLException e) {
			e.printStackTrace();
		}finally {
			//关闭jdbc相关对象
			if(rs!=null) {
				try {
					rs.close();
				} catch (SQLException e) {
					e.printStackTrace(




    
);
			if(ps!=null) {
				try {
					ps.close();
				} catch (SQLException e) {
					e.printStackTrace();
			if(conn!=null) {
				try {
					conn.close();
				} catch (SQLException e) {
					e.printStackTrace();
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Timestamp;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
 * 查询一定时间范围的数据
 * @author 2Π
public class Demo08 {
	 * 将字符串日期转化成long数字
	 * @param date	(格式yyyy-MM-dd hh:mm:ss)
	 * @return	
	public static long strDate(String date) {
		DateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
		try {
			return format.parse(date).getTime();
		} catch (ParseException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			return 0;
	public static void main(String[] args){
		//创建连接对象
		Connection conn =null;
		//创建准备做事的对象
		PreparedStatement ps =null;
		//接收返回的查询结果
		ResultSet rs =null;
		//加载驱动类
		try {
			Class.forName("com.mysql.jdbc.Driver");
			conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/testjdbc","root","000000");
			//sql语句
			String sqlStr = "select * from tb_user where loginTime>? and loginTime<?";
			ps = conn.prepareStatement(sqlStr);
			//设置时间段	8:00 到 9：00
			Timestamp start = new Timestamp(strDate("2020-04-24 08:00:00"));
			Timestamp end = new Timestamp(strDate("2020-04-24 09:00:00"));
			ps.setTimestamp(1, start);
			ps.setTimestamp(2, end);
			//执行返回
			rs = ps.executeQuery();
			//读取打印
			while (rs.next()) {
				System.out.println(rs.getString("uName")+"==="+rs.getObject("loginTime"));
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}catch (SQLException e) {
			e.printStackTrace();
		}finally {
			//关闭jdbc相关对象
			if(rs!=null) {
				try {
					rs.close();
				} catch (SQLException e) {
					e.printStackTrace();
			if(ps!=null) {
				try {
					ps.close();
				} catch (SQLException e) {
					e.printStackTrace();
			if(conn!=null) {
				try {
					conn.close();
				} catch (SQLException e) {
					e.printStackTrace();
查询结果：
 
                    增删改package com.yzx.JDBC01;import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.sql.SQLException;import java.sql.Statement;/** * 利用PreparedS...
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLE...
				习惯直接使用JdbcTemplate，对于其他的jdbc工具类就没怎么了解，最近使用查询带in参数时，发现无论怎么传参数，都会抛出异常，感觉jdbcTemplate搞不定了。 
查找了资料，发现NamedParameterJdbcTemplate可以解决问题。 
下面是NamedParamet...
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.Sim
        select * from sys_logs
        where  substr(concat(createdTime), 1, 10) = #{time}
        order by createdTime
            temp = new Date();
            list = sysLogDao.findLogByDay(new SimpleDateFormat("y
CREATE TABLEdatetest(
idint(11) NOT NULL AUTO_INCREMENT,
brand_namevarchar(100) DEFAULT NULL COMMENT '品牌名称',
model_namevarchar(100) DEFAULT NULL C...
				查询方法1
SELECT * FROM  tableTest WHERE tableTest.time  BETWEEN '2011-01-01' AND  '2013-03-03'
查询方法2
SELECT * FROM  tableTest WHERE  tableTest.time  BETWEEN STR_TO_DATE('2011-01-01','%Y-%m-%d') AND
					使用数据库连接池C3P0及JDBC技术，并结合JSP、Servlet以及Filter等JavaWeb技术实现数据库中的学生信息数据实现增加、修改、删除、查询等操作。 【需求说明】 （1）学生信息包括：学号、姓名、性别、出生日期、所在院系、爱好、个人简介等信息； （2）分别设计： addStu.jsp、editStu.jsp和stuList.jsp用于实现用户交互； （3）分别设计：SaveStudentServlet、EditStudentServlet、DelStudentServlet和SearchStudentServlet四个Servlet程序，用于实现对学生信息数据的增加、修改、删除、查询等功能。 （4）Filter过滤器解决POST提交方式时的中文乱码问
这是一个比较全面的JavaWeb应用，需要涉及到数据库操作、JSP页面、Servlet程序以及Filter过滤器等多个方面。下面我会分别介绍一下各个方面的实现。
一、数据库连接池C3P0及JDBC技术
1.1 数据库准备
首先需要准备好一个数据库，在本例中我们使用MySQL数据库。创建一个名为student的数据库，并在该数据库中创建一个名为stu_info的表，包含学号、姓名、性别、出生日期、所在院系、爱好、个人简介等信息。
1.2 C3P0连接池配置
使用C3P0连接池可以有效地提高数据库连接的效率和稳定性。在项目中，我们需要在web.xml文件中配置一个参数，用来指定C3P0配置文件的路径。
```xml
<context-param>
    <param-name>configLocation</param-name>
    <param-value>/WEB-INF/c3p0-config.xml</param-value>
</context-param>
然后在项目的WEB-INF目录下创建一个名为c3p0-config.xml的文件，并在其中进行连接池的配置。
```xml
<?xml version="1.0" encoding="UTF-8"?>
<c3p0-config>
    <default-config>
        <property name="jdbcUrl">jdbc:mysql://localhost:3306/student</property>
        <property name="driverClass">com.mysql.jdbc.Driver</property>
        <property name="user">root</property>
        <property name="password">123456</property>
        <property name="maxPoolSize">50</property>
        <property name="minPoolSize">5</property>
        <property name="initialPoolSize">10</property>
        <property name="maxIdleTime">1800</property>
        <property name="acquireIncrement">3</property>
        <property name="idleConnectionTestPeriod">60</property>
        <property name="checkoutTimeout">10000</property>
    </default-config>
</c3p0-config>
1.3 JDBC编程
在JavaWeb应用中，我们需要使用JDBC技术来连接数据库并进行数据的增删改查。在本例中，我们可以使用以下代码来连接数据库并查询学生信息。
```java
public class StudentDao {
    private ComboPooledDataSource dataSource;
    public StudentDao() throws Exception {
        dataSource = new ComboPooledDataSource();
    // 获取学生信息
    public List<Student> getStudents() {
        Connection conn = null;
        PreparedStatement stmt = null;
        ResultSet rs = null;
        List<Student> students = new ArrayList<Student>();
        try {
            conn = dataSource.getConnection();
            String sql = "SELECT * FROM stu_info";
            stmt = conn.prepareStatement(sql);
            rs = stmt.executeQuery();
            while (rs.next()) {
                Student student = new Student();
                student.setSno(rs.getString("sno"));
                student.setName(rs.getString("name"));
                student.setSex(rs.getString("sex"));
                student.setBirthday(rs.getDate("birthday"));
                student.setDepartment(rs.getString("department"));
                student.setHobby(rs.getString("hobby"));
                student.setIntro(rs.getString("intro"));
                students.add(student);
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                if (rs != null) rs.close();
                if (stmt != null) stmt.close();
                if (conn != null) conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
        return students;
二、JSP页面
在JavaWeb应用中，我们通常需要使用JSP页面来实现前端页面的展示和用户交互。在本例中，我们需要设计三个JSP页面，分别是addStu.jsp、editStu.jsp和stuList.jsp。其中，addStu.jsp页面用来添加学生信息，editStu.jsp页面用来编辑学生信息，stuList.jsp页面用来展示学生信息列表。
addStu.jsp页面代码：
```html
<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
        <meta charset="UTF-8">
        <title>添加学生信息</title>
    </head>
        <h1>添加学生信息</h1>
        <form action="${pageContext.request.contextPath}/saveStudent" method="post">
            <table>
                    <td>学号：</td>
                    <td><input type="text" name="sno"></td>
                    <td>姓名：</td>
                    <td><input type="text" name="name"></td>
                    <td>性别：</td>
                        <input type="radio" name="sex" value="男">男
                        <input type="radio" name="sex" value="女">女
                    <td>出生日期：</td>
                    <td><input type="date" name="birthday"></td>
                    <td>所在院系：</td>
                    <td><input type="text" name="department"></td>
                    <td>爱好：</td>
                    <td><input type="text" name="hobby"></td>
                    <td>个人简介：</td>
                    <td><textarea name="intro"></textarea></td>
                    <td colspan="2">
                        <input type="submit" value="保存">
                        <input type="reset" value="重置">
            </table>
        </form>
    </body>
</html>
editStu.jsp页面代码：
```html
<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
        <meta charset="UTF-8">
        <title>编辑学生信息</title>
    </head>
        <h1>编辑学生信息</h1>
        <form action="${pageContext.request.contextPath}/editStudent" method="post">
            <table>
                    <td>学号：</td>
                    <td><input type="text" name="sno" value="${student.sno}" readonly></td>
                    <td>姓名：</td>
                    <td><input type="text" name="name" value="${student.name}"></td>
                    <td>性别：</td>
                        <input type="radio" name="sex" value="男" ${student.sex == '男' ? 'checked' : ''}>男
                        <input type="radio" name="sex" value="女" ${student.sex == '女' ? 'checked' : ''}>女
                    <td>出生日期：</td>
                    <td><input type="date" name="birthday" value="${student.birthday}"></td>
                    <td>所在院系：</td>
                    <td><input type="text" name="department" value="${student.department}"></td>
                    <td>爱好：</td>
                    <td><input type="text" name="hobby" value="${student.hobby}"></td>
                    <td>个人简介：</td>
                    <td><textarea name="intro">${student.intro}</textarea></td>
                    <td colspan="2">
                        <input type="submit" value="保存">
                        <input type="reset" value="重置">
            </table>
        </form>
    </body>
</html>
stuList.jsp页面代码：
```html
<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
        <meta charset="UTF-8">
        <title>学生信息列表</title>
    </head>
        <h1>学生信息列表</h1>
        <table border="1">
                <th>学号</th>
                <th>姓名</th>
                <th>性别</th>
                <th>出生日期</th>
                <th>所在院系</th>
                <th>爱好</th>
                <th>个人简介</th>
                <th>操作</th>
            <c:forEach items="${students}" var="student">
                    <td>${student.sno}</td>
                    <td>${student.name}</td>
                    <td>${student.sex}</td>
                    <td>${student.birthday}</td>
                    <td>${student.department}</td>
                    <td>${student.hobby}</td>
                    <td>${student.intro}</td>
                        <a href="${pageContext.request.contextPath}/editStu?sno=${student.sno}">编辑</a>
                        <a href="${pageContext.request.contextPath}/delStudent?sno=${student.sno}">删除</a>
            </c:forEach>
        </table>
        <a href="${pageContext.request.contextPath}/addStu.jsp">添加学生信息</a>
    </body>
</html>
三、Servlet程序
在JavaWeb应用中，我们需要使用Servlet程序来处理HTTP请求和响应。在本例中，我们需要设计四个Servlet程序，分别是SaveStudentServlet、EditStudentServlet、DelStudentServlet和SearchStudentServlet。
SaveStudentServlet用来保存学生信息，EditStudentServlet用来编辑学生信息，DelStudentServlet用来删除学生信息，SearchStudentServlet用来查询学生信息。
SaveStudentServlet代码：
```java
public class SaveStudentServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    private StudentDao studentDao;
    public SaveStudentServlet() {
        super();
    public void init() throws ServletException {
        try {
            studentDao = new StudentDao();
        } catch (Exception e) {
            e.printStackTrace();
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        String sno = request.getParameter("sno");
        String name = request.getParameter("name");
        String sex = request.getParameter("sex");
        String birthday = request.getParameter("birthday");
        String department = request.getParameter("department");
        String hobby = request.getParameter("hobby");
        String intro = request.getParameter("intro");
        Student student = new Student();
        student.setSno(sno);
        student.setName(name);
        student.setSex(sex);
        student.setBirthday(Date.valueOf(birthday));
        student.setDepartment(department);
        student.setHobby(hobby);
        student.setIntro(intro);
        try {
            studentDao.addStudent(student);
        } catch (Exception e) {
            e.printStackTrace();
        response.sendRedirect(request.getContextPath() + "/stuList");
EditStudentServlet代码：
```java
public class EditStudentServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    private StudentDao studentDao;
    public EditStudentServlet() {
        super();
    public void init() throws ServletException {
        try {
            studentDao = new StudentDao();
        } catch (Exception e) {
            e.printStackTrace();
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String sno = request.getParameter("sno");
        Student student = null;
        try {
            student = studentDao.getStudent(sno);
        } catch (Exception e) {
            e.printStackTrace();
        request.setAttribute("student", student);
        request.getRequestDispatcher("/editStu.jsp").forward(request, response);
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        String sno = request.getParameter("sno");
        String name = request.getParameter("name");
        String sex = request.getParameter("sex");
        String birthday = request.getParameter("birthday");
        String department = request.getParameter("department");
        String hobby = request.getParameter("hobby");
        String intro = request.getParameter("intro");
        Student student = new Student();
        student.setSno(sno);
        student.setName(name);
        student.setSex(sex);
        student.setBirthday(Date.valueOf(birthday));
        student.setDepartment(department);
        student.setHobby(hobby);
        student.setIntro(intro);
        try {
            studentDao.updateStudent(student);
        } catch (Exception e) {
            e.printStackTrace();
        response.sendRedirect(request.getContextPath() + "/stuList");
DelStudentServlet代码：
```java
public class DelStudentServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    private StudentDao studentDao;
    public DelStudentServlet() {
        super();
    public void init() throws ServletException {
        try {
            studentDao = new StudentDao();
        } catch (Exception e) {
            e.printStackTrace();
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String sno = request.getParameter("sno");
        try {
            studentDao.delStudent(sno);
        } catch (Exception e) {
            e.printStackTrace();
        response.sendRedirect(request.getContextPath() + "/stuList");
SearchStudentServlet代码：
```java
public class SearchStudentServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    private StudentDao studentDao;
    public SearchStudentServlet() {
        super();
    public void init() throws ServletException {
        try {
            studentDao = new StudentDao();
        } catch (Exception e) {
            e.printStackTrace();
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        String keyword = request.getParameter("keyword");
        List<Student> students = null;
        try {
            students = studentDao.searchStudent(keyword);
        } catch (Exception e) {
            e.printStackTrace();
        request.setAttribute("students", students);
        request.getRequestDispatcher("/stuList.jsp").forward(request, response);
四、Filter过滤器
在JavaWeb应用中，我们需要使用Filter过滤器来对HTTP请求和响应进行过滤处理。在本例中，我们需要使用Filter过滤器来解决POST提交方式时的中文乱码问题。
Filter过滤器代码：
```java
public class EncodingFilter implements Filter {
    private String encoding = "UTF-8";
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain)
            throws IOException, ServletException {
        request.setCharacterEncoding(encoding);
        response.setCharacterEncoding(encoding);
        filterChain.doFilter(request, response);
    public void init(FilterConfig filterConfig) throws ServletException {
        String encodingParam = filterConfig.getInitParameter("encoding");
        if (encodingParam != null) {
            encoding = encodingParam;
    public void destroy() {
在web.xml文件中配置Filter过滤器：
```xml
<filter>
    <filter-name>encodingFilter</filter-name>
    <filter-class>com.example.EncodingFilter</filter-class>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>UTF-8</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>
以上就是本例中JavaWeb应用的实现，包括C3P0连接池的配置、JSP页面的设计、Servlet程序的编写以及Filter过滤器的使用。