Question

我想将我的文本框值（“ 20”）插入数据库。我该怎么做？而且，如果用户从未在文本框中输入任何值，它将通知用户。

我已经创建了一个js文件，但是它不起作用...

assign.js

document.getElementById("assignBtn").onclick = function () {
    var errmessage = "";
    var na = document.forms["assignTo"]["Number"].value;
    if (na == "") {
        //if(document.getElementById("ExerciseArm").value=="") {
        errmessage += "*Please enter the number of time for arm<br>";
    }
    var nl = document.forms["assignTo"]["Number"].value;
    if (nl == "") {
        //if(document.getElementById("ExerciseTime1").value=="") {
        errmessage += "*Please enter the number of time for leg <br>";
    }
    if (na != "" && nl == "") {
        document.assignTo.submit();
        alert('Exercise has been assigned succesfully.');
    } else if (na == "" && nl != "") {
        document.assignTo.submit();
        alert('Exercise has been assigned succesfully.');
    } else if (na != "" && nl != "") {
        document.assignTo.submit();
        alert('Exercise has been assigned succesfully.');
    } else if (errmessage.length > 0) {
        errmessage = errmessage.fontcolor("red");
        errmessage = errmessage.fontsize("2");
        document.getElementById("divMessage").innerHTML = errmessage;
    }
}

assignTo.jsp

String[] id = request.getParameterValues("assignchkbox");
String armID = request.getParameter("ArmID");
String number = request.getParameter("Number");
int count = 0;
Connection conn = null;
try {
    Class.forName("com.mysql.jdbc.Driver");
    // Step 2: Define Connection URL
    String connURL = "jdbc:mysql://localhost/medicloud?user=root&password=root";
    // Step 3: Establish connection to URL
    conn = DriverManager.getConnection(connURL);

    if (id != null) {
        for (int i = 0; i < id.length; i++) {

            String sqlStr = "Insert into assign(ArmID,Number) Value(?,?)";
            PreparedStatement pstmt = conn.prepareStatement(sqlStr);
            pstmt.setInt(1, Integer.parseInt(id[i]));
            pstmt.setString(2, number);
            //pstmt.setInt(1, Integer.parseInt(ids[i]));
            int rec = pstmt.executeUpdate();
            if (rec == 1) {
                count++;
                response.sendRedirect("assign.jsp");
            }
        }

    }
}

忽略所有jsp文件夹中的ID（它们按照我想要的方式工作）。现在唯一的问题是，文本框值未插入数据库，并且Idk错误在哪里

Answer 1

请尝试您的jsp文件是否接受来自表单的所需值：

String username = "<your username>";
String pass = "<your pass>";
Class.forName("com.mysql.jdbc.Driver");
String connURL = "jdbc:mysql://localhost:<port>/medicloud";
conn = DriverManager.getConnection(connURL,username,pass);

代替您的代码。在某些情况下，您必须将mysqljdbc.jar导入WEB-INF / lib，我不太清楚该路径，请在您的项目中检查它。

别忘了证明您的数据库实例端口，在mysql中应该是3306。

您的代码根本不干净，您应该捕获异常以获取更多调试所需的信息。

JSP提交文本框值

1 个答案: