Question

我所拥有的是需要清理的旧Access数据库。我首先尝试从旧数据库中取出字段并将它们插入到新数据库中。我能够连接到两个数据库，但没有记录插入到新的DB Employee表中。不确定我的SQL是否有问题。有人可以帮忙吗？

Run.java：

package javaapplication1; 

/** 
 * 
 * @author Tyler Bradshaw 
 */

public class Run { 
    public static void main(String[] args) { 
        Convert.ConnectToOld(); 
        Convert.ConnectToNew(); 
        Convert.EmployeeTransfer(); 

    } 
}

Convert.java：

package javaapplication1; 

/** 
 * 
 * @author Tyler Bradshaw 
 */
import javax.swing.JOptionPane; 
public class Convert { 

    static DbWork oldDatabase = new DbWork(); 
    static DbWork newDatabase = new DbWork(); 

    public static void ConnectToOld(){ 
        oldDatabase.Constructor("oldDatabase"); 
        if (oldDatabase.isConnected()) 
            System.out.println("Connected to old database."); 
    } 

    public static void ConnectToNew(){ 
        newDatabase.Constructor("newDatabase"); 
        if (newDatabase.isConnected()) 
            System.out.println("Connected to new database."); 
    } 

    public static void EmployeeTransfer(){ 

        String readOld = "SELECT * FROM EmployeeTable"; 

        try{ 
            if (!oldDatabase.isConnected()){ 
                ConnectToOld(); 
            } 
            if (!newDatabase.isConnected()){ 
                ConnectToNew(); 
            } 
            oldDatabase.processQuery(readOld); 
            while(oldDatabase.nextRecord()){ 
               String empID = oldDatabase.getField("ID"); 
               String fName = oldDatabase.getField("First Name"); 
               String lName = oldDatabase.getField("Last Name"); 
               String mI = oldDatabase.getField("MI"); 
               String homeAdd = oldDatabase.getField("Home Address"); 
               String state = oldDatabase.getField("State"); 
               String zip = oldDatabase.getField("Zip"); 
               String dob = oldDatabase.getField("Date of Birth"); 
               String hireDate = oldDatabase.getField("Hire Date"); 
               String termDate = oldDatabase.getField("Termination Date"); 
               String licDate = oldDatabase.getField("License Date"); 

               /* validation */

               String loadNew = "INSERT INTO EmployeeTable (EmployeeID, FirstName,"
                + "LastName, MI, HomeAddress, Sta , ZIP, DateOfBirth, HireDate,"
                + "TerminationDate, LicenseDate) VALUES ('empID', '" + fName + "', '" + lName + "', '" + mI + "',"
                + "'" + homeAdd + "', '" + state + "', '" + zip + "', '" + dob + "', '" + hireDate + "', '" + termDate + "', '" + licDate + "')"; 
               newDatabase.processUpdate(loadNew); 
            } 
            System.out.println("Done?"); 
            } 

        catch (Exception ex) { 
            JOptionPane.showMessageDialog(null, "Error"); 


        } 
    } 

}

DbWork.java：

package javaapplication1; 


import java.sql.*; 

public class DbWork { 

    private Connection connection; 
    private ResultSet rs; 
    private String errorMessage; 

    public void Constructor(String dsn) { 
        try { 
            Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); 
            String URL = "jdbc:odbc:"+dsn; 
            connection = DriverManager.getConnection(URL,"",""); 
        } catch (Exception e) { 
            errorMessage = "Cannot Connect to Database."; 
        }   
    } 

    public boolean isConnected() { 
        try { 
            if (connection == null || connection.isClosed()) { 
                return false; 
            } else { 
                return true; 
            } 
        } catch (Exception e) { 
            return false; 
        } 
    } 

    public boolean processQuery(String selectQuery) {         
        try { 
            Statement stmt = connection.createStatement(); 
            rs = stmt.executeQuery(selectQuery); 
            return true; 
        } 

        catch (Exception l) { 
            errorMessage = "Result Set for query failed."; 
            rs = null; 
            return false; 
        } 
    } 

    public boolean nextRecord() {  
        try { 
            if (rs.next()) { 
                return true; 
            } else { 
                errorMessage = "End of File"; 
                return false; 
            } 
        }  
        catch (Exception e) { 
            errorMessage = "Exception occured when moving to next record."; 
            return false;     
        } 
    } 

    public String getField(int fieldNum) { 
        try { 
            int columnIndex = fieldNum; 
            return rs.getString(columnIndex); 
        } 
        catch (Exception e) { 
            errorMessage = "Exception occured when returning field."; 
            return null; 
        } 
    } 

    public String getField(String fieldName) { 
        try { 
            String columnLabel = fieldName; 
            return rs.getString(columnLabel); 
        } 
        catch (Exception e) { 
            errorMessage = "Exception occured when returning field."; 
            return null; 
        } 
    } 

    public void close() { 
        connection = null; 
    } 

    public String getErrorMessage() {  
        return errorMessage; 
    } 

    public boolean processUpdate(String statement) { 
        String sql = statement; 
        try { 
            Statement stmt = connection.createStatement(); 
            int nbr = stmt.executeUpdate(sql); 
            return true; 
        } 
        catch (Exception e) { 
            errorMessage = "Database update failed."; 
            rs = null; 
            return false; 
        } 
    } 
}

Answer 1

尝试更改processUpdate方法和catch语句。希望这可以帮助您确定问题。

} catch (SQLException e) {

            System.out.println(e.getMessage());

        } finally {

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

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

        }

将数据从旧的Access数据库传输到新的

1 个答案: