idea连接sql数据库，在idea中创建一个个人信息的表单，实现对数据库的增删改查操作

好的，这是一个关于技术的问题，我可以帮您回答。首先，您需要在IDEA中连接您的SQL数据库，可以选择使用JDBC来连接。然后，您可以在数据库中创建一个名为“个人信息”的表单，并定义表单中的字段和数据类型。接下来，您可以使用Java编写增删改查的操作，将代码与您的数据库连接起来。例如，您可以使用PreparedStatement实现安全且高效的SQL查询语句，对数据库进行增删改查操作。希望这些信息可以对您有所帮助。

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idea写一个Servlet以实现增删改查 Emp表，连接oracle数据库

好的，我可以帮您实现一个Servlet来实现Emp表的增删改查操作并连接到Oracle数据库。

首先，您需要在您的项目中添加Oracle数据库的JDBC驱动程序，并将其添加到Web应用程序的类路径中。您可以在以下链接中下载Oracle的JDBC驱动程序：https://www.oracle.com/database/technologies/jdbcdriver-ucp-downloads.html

接下来，您需要创建一个Emp类，该类包含Emp表中的所有字段：

public class Emp {
    private int empno;
    private String ename;
    private String job;
    private int mgr;
    private Date hiredate;
    private double sal;
    private double comm;
    private int deptno;

    // getters and setters
}

然后，您需要创建一个EmpDAO类，该类包含所有与Emp表相关的数据库操作方法：

public class EmpDAO {
    private Connection conn;

    public EmpDAO(Connection conn) {
        this.conn = conn;
    }

    public List<Emp> getAllEmps() throws SQLException {
        List<Emp> emps = new ArrayList<>();
        String sql = "SELECT * FROM emp";
        try (PreparedStatement stmt = conn.prepareStatement(sql)) {
            try (ResultSet rs = stmt.executeQuery()) {
                while (rs.next()) {
                    Emp emp = new Emp();
                    emp.setEmpno(rs.getInt("empno"));
                    emp.setEname(rs.getString("ename"));
                    emp.setJob(rs.getString("job"));
                    emp.setMgr(rs.getInt("mgr"));
                    emp.setHiredate(rs.getDate("hiredate"));
                    emp.setSal(rs.getDouble("sal"));
                    emp.setComm(rs.getDouble("comm"));
                    emp.setDeptno(rs.getInt("deptno"));
                    emps.add(emp);
                }
            }
        }
        return emps;
    }

    public Emp getEmpById(int empno) throws SQLException {
        String sql = "SELECT * FROM emp WHERE empno = ?";
        try (PreparedStatement stmt = conn.prepareStatement(sql)) {
            stmt.setInt(1, empno);
            try (ResultSet rs = stmt.executeQuery()) {
                if (rs.next()) {
                    Emp emp = new Emp();
                    emp.setEmpno(rs.getInt("empno"));
                    emp.setEname(rs.getString("ename"));
                    emp.setJob(rs.getString("job"));
                    emp.setMgr(rs.getInt("mgr"));
                    emp.setHiredate(rs.getDate("hiredate"));
                    emp.setSal(rs.getDouble("sal"));
                    emp.setComm(rs.getDouble("comm"));
                    emp.setDeptno(rs.getInt("deptno"));
                    return emp;
                } else {
                    return null;
                }
            }
        }
    }

    public void addEmp(Emp emp) throws SQLException {
        String sql = "INSERT INTO emp (empno, ename, job, mgr, hiredate, sal, comm, deptno) VALUES (?, ?, ?, ?, ?, ?, ?, ?)";
        try (PreparedStatement stmt = conn.prepareStatement(sql)) {
            stmt.setInt(1, emp.getEmpno());
            stmt.setString(2, emp.getEname());
            stmt.setString(3, emp.getJob());
            stmt.setInt(4, emp.getMgr());
            stmt.setDate(5, emp.getHiredate());
            stmt.setDouble(6, emp.getSal());
            stmt.setDouble(7, emp.getComm());
            stmt.setInt(8, emp.getDeptno());
            stmt.executeUpdate();
        }
    }

    public void updateEmp(Emp emp) throws SQLException {
        String sql = "UPDATE emp SET ename = ?, job = ?, mgr = ?, hiredate = ?, sal = ?, comm = ?, deptno = ? WHERE empno = ?";
        try (PreparedStatement stmt = conn.prepareStatement(sql)) {
            stmt.setString(1, emp.getEname());
            stmt.setString(2, emp.getJob());
            stmt.setInt(3, emp.getMgr());
            stmt.setDate(4, emp.getHiredate());
            stmt.setDouble(5, emp.getSal());
            stmt.setDouble(6, emp.getComm());
            stmt.setInt(7, emp.getDeptno());
            stmt.setInt(8, emp.getEmpno());
            stmt.executeUpdate();
        }
    }

    public void deleteEmp(int empno) throws SQLException {
        String sql = "DELETE FROM emp WHERE empno = ?";
        try (PreparedStatement stmt = conn.prepareStatement(sql)) {
            stmt.setInt(1, empno);
            stmt.executeUpdate();
        }
    }
}

最后，您需要创建一个EmpServlet类，该类处理所有与客户端的HTTP请求，并调用EmpDAO类中的方法来执行数据库操作：

public class EmpServlet extends HttpServlet {
    private EmpDAO dao;

    @Override
    public void init() throws ServletException {
        try {
            Class.forName("oracle.jdbc.driver.OracleDriver");
            String url = "jdbc:oracle:thin:@//localhost:1521/orcl";
            String username = "your_username";
            String password = "your_password";
            Connection conn = DriverManager.getConnection(url, username, password);
            dao = new EmpDAO(conn);
        } catch (ClassNotFoundException | SQLException e) {
            throw new ServletException(e);
        }
    }

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String action = request.getParameter("action");
        if (action == null) {
            List<Emp> emps = dao.getAllEmps();
            request.setAttribute("emps", emps);
            request.getRequestDispatcher("/WEB-INF/views/empList.jsp").forward(request, response);
        } else if (action.equals("add")) {
            request.getRequestDispatcher("/WEB-INF/views/addEmp.jsp").forward(request, response);
        } else if (action.equals("edit")) {
            int empno = Integer.parseInt(request.getParameter("empno"));
            Emp emp = dao.getEmpById(empno);
            request.setAttribute("emp", emp);
            request.getRequestDispatcher("/WEB-INF/views/editEmp.jsp").forward(request, response);
        } else if (action.equals("delete")) {
            int empno = Integer.parseInt(request.getParameter("empno"));
            dao.deleteEmp(empno);
            response.sendRedirect(request.getContextPath() + "/emp");
        }
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String action = request.getParameter("action");
        if (action.equals("add")) {
            Emp emp = new Emp();
            emp.setEmpno(Integer.parseInt(request.getParameter("empno")));
            emp.setEname(request.getParameter("ename"));
            emp.setJob(request.getParameter("job"));
            emp.setMgr(Integer.parseInt(request.getParameter("mgr")));
            emp.setHiredate(Date.valueOf(request.getParameter("hiredate")));
            emp.setSal(Double.parseDouble(request.getParameter("sal")));
            emp.setComm(Double.parseDouble(request.getParameter("comm")));
            emp.setDeptno(Integer.parseInt(request.getParameter("deptno")));
            dao.addEmp(emp);
            response.sendRedirect(request.getContextPath() + "/emp");
        } else if (action.equals("edit")) {
            Emp emp = new Emp();
            emp.setEmpno(Integer.parseInt(request.getParameter("empno")));
            emp.setEname(request.getParameter("ename"));
            emp.setJob(request.getParameter("job"));
            emp.setMgr(Integer.parseInt(request.getParameter("mgr")));
            emp.setHiredate(Date.valueOf(request.getParameter("hiredate")));
            emp.setSal(Double.parseDouble(request.getParameter("sal")));
            emp.setComm(Double.parseDouble(request.getParameter("comm")));
            emp.setDeptno(Integer.parseInt(request.getParameter("deptno")));
            dao.updateEmp(emp);
            response.sendRedirect(request.getContextPath() + "/emp");
        }
    }
}

在这个例子中，EmpServlet类处理HTTP GET和POST请求。当收到HTTP GET请求时，它会根据参数“action”的值来调用不同的方法。如果“action”是null，则它将获取Emp表中的所有记录并将它们发送到JSP视图进行呈现。如果“action”是“add”，则它将发送一个包含Emp表中所有字段的表单，以便用户添加新记录。如果“action”是“edit”，则它将发送一个包含Emp表中所有字段的表单，以便用户编辑现有记录。如果“action”是“delete”，则它将从Emp表中删除指定的记录。当收到HTTP POST请求时，它将根据参数“action”的值来调用不同的方法。如果“action”是“add”，则它将从表单中获取所有字段的值并将它们插入到Emp表中。如果“action”是“edit”，则它将从表单中获取所有字段的值并将它们更新到Emp表中。

最后，您需要编写JSP视图来呈现Emp表中的数据和表单。您可以创建一个名为empList.jsp的JSP页面来呈现Emp表中的所有记录，一个名为addEmp.jsp的JSP页面来添加新记录，以及一个名为editEmp.jsp的JSP页面来编辑现有记录。这些JSP页面应该使用JSTL和EL表达式来呈现数据和动态生成HTML。

idea写一个Servlet以实现增删改查 Emp表，连接数据库

好的，以下是一个示例代码，可以实现基本的增删改查功能：

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/EmpServlet")
public class EmpServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    private Connection conn;
    private PreparedStatement pstmt;
    private ResultSet rs;

    public void init() {
        String driver = "com.mysql.jdbc.Driver";
        String url = "jdbc:mysql://localhost:3306/test";
        String user = "root";
        String password = "123456";

        try {
            Class.forName(driver);
            conn = DriverManager.getConnection(url, user, password);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request, response);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html;charset=utf-8");
        PrintWriter out = response.getWriter();
        String action = request.getParameter("action");

        if (action.equals("addEmp")) {
            String empno = request.getParameter("empno");
            String ename = request.getParameter("ename");
            String job = request.getParameter("job");
            String mgr = request.getParameter("mgr");
            String hiredate = request.getParameter("hiredate");
            String sal = request.getParameter("sal");
            String comm = request.getParameter("comm");
            String deptno = request.getParameter("deptno");

            String sql = "INSERT INTO emp (empno, ename, job, mgr, hiredate, sal, comm, deptno) VALUES (?, ?, ?, ?, ?, ?, ?, ?)";

            try {
                pstmt = conn.prepareStatement(sql);
                pstmt.setString(1, empno);
                pstmt.setString(2, ename);
                pstmt.setString(3, job);
                pstmt.setString(4, mgr);
                pstmt.setString(5, hiredate);
                pstmt.setString(6, sal);
                pstmt.setString(7, comm);
                pstmt.setString(8, deptno);
                pstmt.executeUpdate();
                out.println("添加成功！");
            } catch (SQLException e) {
                e.printStackTrace();
            }
        } else if (action.equals("deleteEmp")) {
            String empno = request.getParameter("empno");

            String sql = "DELETE FROM emp WHERE empno = ?";

            try {
                pstmt = conn.prepareStatement(sql);
                pstmt.setString(1, empno);
                pstmt.executeUpdate();
                out.println("删除成功！");
            } catch (SQLException e) {
                e.printStackTrace();
            }
        } else if (action.equals("updateEmp")) {
            String empno = request.getParameter("empno");
            String ename = request.getParameter("ename");
            String job = request.getParameter("job");
            String mgr = request.getParameter("mgr");
            String hiredate = request.getParameter("hiredate");
            String sal = request.getParameter("sal");
            String comm = request.getParameter("comm");
            String deptno = request.getParameter("deptno");

            String sql = "UPDATE emp SET ename = ?, job = ?, mgr = ?, hiredate = ?, sal = ?, comm = ?, deptno = ? WHERE empno = ?";

            try {
                pstmt = conn.prepareStatement(sql);
                pstmt.setString(1, ename);
                pstmt.setString(2, job);
                pstmt.setString(3, mgr);
                pstmt.setString(4, hiredate);
                pstmt.setString(5, sal);
                pstmt.setString(6, comm);
                pstmt.setString(7, deptno);
                pstmt.setString(8, empno);
                pstmt.executeUpdate();
                out.println("修改成功！");
            } catch (SQLException e) {
                e.printStackTrace();
            }
        } else if (action.equals("queryEmp")) {
            String empno = request.getParameter("empno");
            String ename = request.getParameter("ename");

            String sql = "SELECT * FROM emp WHERE 1 = 1";

            if (empno != null && !empno.trim().equals("")) {
                sql += " AND empno = '" + empno + "'";
            }

            if (ename != null && !ename.trim().equals("")) {
                sql += " AND ename = '" + ename + "'";
            }

            try {
                pstmt = conn.prepareStatement(sql);
                rs = pstmt.executeQuery();

                while (rs.next()) {
                    out.println("empno: " + rs.getString("empno") + "<br>");
                    out.println("ename: " + rs.getString("ename") + "<br>");
                    out.println("job: " + rs.getString("job") + "<br>");
                    out.println("mgr: " + rs.getString("mgr") + "<br>");
                    out.println("hiredate: " + rs.getString("hiredate") + "<br>");
                    out.println("sal: " + rs.getString("sal") + "<br>");
                    out.println("comm: " + rs.getString("comm") + "<br>");
                    out.println("deptno: " + rs.getString("deptno") + "<br><br>");
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    public void destroy() {
        try {
            if (rs != null) {
                rs.close();
            }

            if (pstmt != null) {
                pstmt.close();
            }

            if (conn != null) {
                conn.close();
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

在这个例子中，我们使用了MySQL数据库，数据库名为test，用户名为root，密码为123456。你可以根据自己的实际情况修改这些参数。在init()方法中，我们使用了JDBC驱动来连接数据库。

在doPost()方法中，我们首先获取前端传来的action参数，根据参数的不同执行不同的操作。如果action为addEmp，表示进行插入操作，我们从request中获取表单数据，使用PreparedStatement对数据库进行操作。如果action为deleteEmp，表示进行删除操作，我们从request中获取要删除的empno，对数据库进行操作。如果action为updateEmp，表示进行更新操作，我们从request中获取要更新的empno以及表单数据，对数据库进行操作。如果action为queryEmp，表示进行查询操作，我们从request中获取要查询的empno和ename，根据不同的情况构造不同的SQL语句，使用PreparedStatement查询数据库，并将结果输出到前端。

最后，我们在destroy()方法中关闭ResultSet、PreparedStatement和Connection对象，释放资源。