我想在Oracle SQL Developer中插入数据。在客户端（我的意思是网页）上，它显示数据已插入，但是当我在SQL Developer中检查它时，没有插入任何数据。
而且我看到此错误消息：
由以下原因引起：错误：1400，位置：88，Sql =插入到记事本（NUM，NAME，EMAIL，CONTENTS）值（BOOK_NUM.NEXTVAL，：1，：2，：3），OriginalSql =插入到记事本（NUM ，名称，电子邮件，内容）值（BOOK_NUM.NEXTVAL，？，？，？），错误消息= ORA-01400：NULL（“ C ## YESMONDAY”。“ NOTICEBOOK”。“ CONTENTS”）
似乎查询不正确，但是我找不到错误的地方。
查看页面（main.jsp）
<body>
<h1>Notice Board</h1>
<div id="wrap">
<div id="wrap_form">
<form action="mainWritePro.jsp" method="post">
<table>
<tr>
<td></td>
<td><input type="text" name="name" placeholder="TITLE "></td>
</tr>
<tr>
<td></td>
<td><input type="text" name="email" placeholder="EMAIL "></td>
</tr>
<tr>
<td> </td>
<td>
<textarea rows="15" cols="50" placeholder="INQUIRY"></textarea>
</td>
</tr>
<tr class="send">
<td colspan="2" align="center"><input type="submit" name="" value="SEND" ></td>
</tr>
</table>
</form>
</div>
<ul>
<li><a href="#">DELETE</a></li>
<li><a href="#">UPDATE</a></li>
<li><a href="#">LIST</a></li>
</ul>
</div>
noticeBoardVO.java
package edu.kosta.vistorsPrac;
public class noticeBoardVO { // Model
private int num; private String name, email, contents;
public noticeBoardVO() {}
public int getNum() { return num; }
public void setNum(int num) { this.num = num; }
public String getName() { return name; }
public void setName(String name) { this.name = name; }
public String getEmail() { return email; }
public void setEmail(String email) { this.email = email; }
public String getContents() { return contents; }
public void setContents(String contents) { this.contents = contents; }
}
noticeBoardDAO.java我认为这里会发生错误。
public class noticeBoardDAO {// Controller
// DB Connection & Open
public static Connection loadOracleDriver() {
Connection conn = null;
try {
conn = ConnectionHelper.getConnection("oracle");
} catch (Exception e) {
e.printStackTrace();
}
return conn;
}
// INSERT
public static void insert(Connection conn, noticeBoardVO vo) {
StringBuffer sb = new StringBuffer();
PreparedStatement pstmt = null;
try {
conn = ConnectionHelper.getConnection("oracle");
sb.append("INSERT INTO noticebook(NUM, NAME, EMAIL, CONTENTS) ");
sb.append(" VALUES(BOOK_NUM.NEXTVAL, ?, ?, ?) ");
System.out.println(sb.toString());
pstmt = conn.prepareStatement(sb.toString());
pstmt.setString(1, vo.getName());
pstmt.setString(2, vo.getEmail());
pstmt.setString(3, vo.getContents());
pstmt.executeUpdate(); //
} catch (Exception e) {
e.printStackTrace();
}
}
mainWritePro.jsp（在用户单击SEND btn之后显示）
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert Page</title>
<link rel="stylesheet" type="text/css" href="../css/main.css">
</head>
<%
request.setCharacterEncoding("utf-8");
%>
<body>
<jsp:useBean id="vo" class="edu.kosta.vistorsPrac.noticeBoardVO"></jsp:useBean>
<jsp:setProperty property="*" name="vo" />
<%
Connection conn = noticeBoardDAO.loadOracleDriver();
noticeBoardDAO.insert(conn, vo);
%>
<h1>Successfully Inserted !</h1>
<ul>
<li><a href="#">DELETE</a></li>
<li><a href="#">UPDATE</a></li>
<li><a href="#">LIST</a></li>
</ul>
</body>
</html>
您的文本区域未设置名称，所以我认为您的内容值为空。