使用JDBC将数据插入数据库中的问题

Question

我在使用jdbc将数据插入到访问中时遇到问题

此声明中出现问题

plz帮助

我的表格有6列 列是id（number），Namee（Short Text），age（number），bsalary（decimal），rate（decimal）和hrs（number）

DBConnect dbconnect = new DBConnect();
dbconnect.getConnection("record.accdb");
Statement statement = dbconnect.getStatement();     

String query = "INSERT INTO sguard " +
                "VALUES (2, '2', 2, 2.5, 2.6, 2);";

        try {
            statement.executeUpdate(query);

        }

这是错误

net.ucanaccess.jdbc.UcanaccessSQLException: UCAExc:::4.0.4 integrity constraint violation: unique constraint or index violation; SYS_PK_10386 table: SGUARD
    at net.ucanaccess.jdbc.UcanaccessStatement.executeUpdate(UcanaccessStatement.java:230)
    at DB.DBManager.writeAuthor(DBManager.java:97)
    at UI.Client.main(Client.java:344)
Caused by: java.sql.SQLIntegrityConstraintViolationException: integrity constraint violation: unique constraint or index violation; SYS_PK_10386 table: SGUARD
    at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source)
    at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source)
    at org.hsqldb.jdbc.JDBCStatement.fetchResult(Unknown Source)
    at org.hsqldb.jdbc.JDBCStatement.executeUpdate(Unknown Source)
    at net.ucanaccess.jdbc.ExecuteUpdate.executeWrapped(ExecuteUpdate.java:65)
    at net.ucanaccess.jdbc.AbstractExecute.executeBase(AbstractExecute.java:264)
    at net.ucanaccess.jdbc.ExecuteUpdate.execute(ExecuteUpdate.java:48)
    at net.ucanaccess.jdbc.UcanaccessStatement.executeUpdate(UcanaccessStatement.java:228)
    ... 2 more
Caused by: org.hsqldb.HsqlException: integrity constraint violation: unique constraint or index violation; SYS_PK_10386 table: SGUARD
    at org.hsqldb.error.Error.error(Unknown Source)
    at org.hsqldb.Constraint.getException(Unknown Source)
    at org.hsqldb.index.IndexAVLMemory.insert(Unknown Source)
    at org.hsqldb.persist.RowStoreAVL.indexRow(Unknown Source)
    at org.hsqldb.TransactionManager2PL.addInsertAction(Unknown Source)
    at org.hsqldb.Session.addInsertAction(Unknown Source)
    at org.hsqldb.Table.insertSingleRow(Unknown Source)
    at org.hsqldb.StatementDML.insertSingleRow(Unknown Source)
    at org.hsqldb.StatementInsert.getResult(Unknown Source)
    at org.hsqldb.StatementDMQL.execute(Unknown Source)
    at org.hsqldb.Session.executeCompiledStatement(Unknown Source)
    at org.hsqldb.Session.executeDirectStatement(Unknown Source)
    at org.hsqldb.Session.execute(Unknown Source)
    ... 8 more

这是用于连接和断开连接的DBCOnnect类

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DBConnect {

    private static Connection connection = null;
    private static Statement statement = null;

    public static void getConnection(String path) {

        try {

            String p = "D:\\ACP Practice Projects\\Assignment 3.1.1\\record.accdb";
            String url = "jdbc:ucanaccess://"+p;

            Class.forName("net.ucanaccess.jdbc.UcanaccessDriver");
            connection = DriverManager.getConnection(url);
            //connection = DriverManager.getConnection("jdbc:ucanaccess://" + path);
            statement  = connection.createStatement();

        }
        catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }       
        catch (SQLException e) {
        // TODO Auto-generated catch block
            System.out.println("exception");
        e.printStackTrace();
        }   
    }
    public static Statement getStatement() {
        return statement;
    }
    public static void disconnect() {
        try {
            connection.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

}

这是DBManager类

import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;


import UI.Employ;
import UI.Lecturer;
import UI.SecurityGuard;

public class DBManager {

    public static  ArrayList<Employ> viewAuthor(){

        ArrayList<Employ> myList = new ArrayList<Employ>();

        DBConnect dbconnect = new DBConnect();
        dbconnect.getConnection("record.accdb");
        Statement statement = dbconnect.getStatement();     

        String query1 = "SELECT * from lecturer";
        String query2 = "SELECT * from sguard";

        int col1,col3,col6;
        String col2;
        float col4,col5;
        boolean col7;

        try {
            ResultSet resultset1=statement.executeQuery(query1);

            while(resultset1.next()) {
                col1 = resultset1.getInt("id");
                col2 = resultset1.getString("Namee");
                col3 = resultset1.getInt("age");
                col4 = resultset1.getFloat("bsalary");
                col5 = resultset1.getFloat("rate");
                col6 = resultset1.getInt("courses");

                myList.add(new Lecturer(col1,col2,col3,col4,col6,col5));
                /*System.out.println(col1);System.out.println(col2);System.out.println(col3);System.out.println(col4);System.out.println(col5);System.out.println(col6);System.out.println(col7);*/

            }

            ResultSet resultset2=statement.executeQuery(query2);

            while(resultset2.next()) {
                col1 = resultset2.getInt("id");
                col2 = resultset2.getString("Namee");
                col3 = resultset2.getInt("age");
                col4 = resultset2.getFloat("bsalary");
                col5 = resultset2.getFloat("rate");
                col6 = resultset2.getInt("hrs");

                myList.add(new SecurityGuard(col1,col2,col3,col4,col6,col5));   
                /*System.out.println(col1);System.out.println(col2);System.out.println(col3);System.out.println(col4);System.out.println(col5);System.out.println(col6);System.out.println(col7);*/

            }

            //System.out.println(col1 +"  ." + col2);

        }
        catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        finally {
            DBConnect.disconnect();
        }
        for (int j = 0; j < myList.size(); j++) {
            System.out.println(myList.get(j).toString());
        }


        return myList;




    }

    public static boolean writeAuthor(ArrayList<Employ> mylist){



        DBConnect dbconnect = new DBConnect();
        dbconnect.getConnection("record.accdb");
        Statement statement = dbconnect.getStatement();     

        String query = "INSERT INTO sguard " +
                "VALUES (2, '2', 2, 2.5, 2.6, 2);";

        try {
            //ResultSet resultset=statement.executeQuery(query);
            statement.executeUpdate(query);
            //statement.execute(query, 6);
        }
        catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        finally {
            DBConnect.disconnect();
        }
        for (int j = 0; j < mylist.size(); j++) {
            System.out.println(mylist.get(j).toString());
        }


        return false;
    }



}