なぜエラーが発生するのですか?私は何をすべきか?Java EE(jsdk)とclasses12をintellijに追加し、classes12をtomcatのlibディレクトリに追加しました。これはDataAccessLayerです。
public class DataBase {
private Connection connection;
private PreparedStatement statement;
public DataBase() throws ClassNotFoundException, SQLException {
Class.forName("oracle.jdbc.driver.OracleDriver");
connection = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe", "SYSTEM", "1234");
}
public void insertOrUpdateOrDelete(String sqlQuery) throws SQLException {
statement = connection.prepareStatement(sqlQuery);
statement.executeUpdate();
}
public ResultSet select(String sqlQuery) throws SQLException {
statement = connection.prepareStatement(sqlQuery);
ResultSet resultSet = statement.executeQuery();
return resultSet;
}
public void disconnect() throws SQLException {
statement.close();
connection.close();
}
}
このクラスは、データベースクラスから使用します。
public class Users {
DataBase dataBase;
public Users() throws ClassNotFoundException, SQLException {
dataBase = new DataBase();
}
public void addUser(HttpServletRequest request) throws SQLException {
String sqlQuery = "insert into users (name,family,email,tel,password) values('" + request.getParameter("name") + "','" + request.getParameter("family") + "','" + request.getParameter("email") + "','" + request.getParameter("tel") + "','" + request.getParameter("password") + "')";
dataBase.insertOrUpdateOrDelete(sqlQuery);
dataBase.disconnect();
}
そして、これは私の登録jspページです。どのユーザーが送信ボタンをクリックしたかを確認し、データベースに保存します。
<%
if (request.getParameter("name") != null) {
try {
Users user = new Users();
user.addUser(request);
} catch (Exception error) {
error.printStackTrace();
}
}
%>
<form id="RegisterForm" action="Regist.jsp" method="post">
<div>
<div class="wrapper">
<div class="bg"><input type="text" class="input" name="name"/></div>
Name:<br/>
</div>
<div class="wrapper">
<div class="bg"><input type="text" class="input" name="family"/></div>
Family:<br/>
</div>
<div class="wrapper">
<div class="bg"><input type="text" class="input" name="email"/></div>
E-mail:<br/>
</div>
<div class="wrapper">
<div class="bg"><input type="password" class="input" name="password"/></div>
Password:<br/>
</div>
<div class="wrapper">
<div class="bg"><input type="text" class="input" name="tel"/></div>
Tel:<br/>
</div>
<input Class="button1" type="submit" value="SUBMIT"/>
<input Class="button1" type="reset" value="RESET"/>
</div>
</form>
しかし、私には例外があります
Exceptions :
java.sql.SQLException: ORA-01400: cannot insert NULL into ("SYSTEM"."USERS"."ID")
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:124)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:304)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:271)
at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:625)
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:181)
at oracle.jdbc.driver.T4CPreparedStatement.execute_for_rows(T4CPreparedStatement.java:791)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1032)
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:2884)
at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:2956)
at airAgency.DataBase.insertOrUpdateOrDelete(DataBase.java:24)
at airAgency.Users.addUser(Users.java:24)
at org.apache.jsp.Regist_jsp._jspService(Regist_jsp.java:125)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:619)