我使用 Apache Derby 作为嵌入式数据库。
数据库检查.java
此类用于创建表。
package normal;
//This class if s for checking the database. If the database doesn't exists, this class will create one
import java.sql.*;
public class DatabaseCheck
{
private Connection con;
public DatabaseCheck()
{
createConnection();
try
{
Statement st = con.createStatement();
st.executeQuery("select * from PhoneData");
new MainForm();
}
catch(Exception e)
{
System.out.println(e.getLocalizedMessage());
if(e.getLocalizedMessage().equals("Schema 'SA' does not exist"))
{
try
{
PreparedStatement ps = con.prepareStatement("create table PhoneData(ids integer generated always as identity constraint pkId primary key,names varchar(20),mobileNumber1 varchar(20),mobileNumber2 varchar(20),landNumber1 varchar(20),landNumber2 varchar(20),address varchar(100),category varchar(20),nickName varchar(20),email varchar(20),middleName varchar(20),lastName varchar(20),city varchar(20),country varchar(20))");
ps.execute();
PreparedStatement ps2 = con.prepareStatement("create table Emails(accountType varchar(10) constraint pk_user primary key,userName varchar(50) ,passwords varchar(50))");
ps2.execute();
new MainForm();
}
catch(Exception e2)
{
e2.printStackTrace();
}
}
}
finally
{
closeConnection();
}
}
public void createConnection()
{
try
{
Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
con = DriverManager.getConnection("jdbc:derby:PhoneBook;create=true","sa","sasasa");
}
catch(Exception e)
{
e.printStackTrace();
}
}
public void closeConnection()
{
try
{
con.close();
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
创建表后，我使用另一个类中的方法插入数据。
public void createConnection()
{
try
{
Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
con = DriverManager.getConnection("jdbc:derby:PhoneBook","sa","sasasa");
}
catch(Exception e)
{
e.printStackTrace();
}
}
@Override
public void closeConnection()
{
try
{
con.close();
}
catch(Exception e)
{
e.printStackTrace();
}
}
@Override
public String insertData(String firstName, String mobileNumber1, String mobileNumber2, String landNumber1, String landNumber2, String streetAddress, String category, String nickName, String email, String middleName, String lastName, String city, String country)
{
String resultString="";
try
{
createConnection();
con.setAutoCommit(false);
PreparedStatement ps = con.prepareStatement("insert into PhoneData values(?,?,?,?,?,?,?,?,?,?,?,?,?)");
ps.setString(1, firstName);
ps.setString(2, mobileNumber1);
ps.setString(3, mobileNumber2);
ps.setString(4, landNumber1);
ps.setString(5,landNumber2);
ps.setString(6,streetAddress);
ps.setString(7,category);
ps.setString(8,nickName);
ps.setString(9,email);
ps.setString(10,middleName);
ps.setString(11,lastName);
ps.setString(12,city);
ps.setString(13,country);
int result = ps.executeUpdate();
if(result>0)
{
resultString = "Data Entered Successfully";
}
else
{
resultString = "Data Enter Failed";
}
con.commit();
}
catch(SQLException se)
{
try
{
con.rollback();
resultString = "Data rollbacked because of an error";
se.printStackTrace();
}
catch(Exception e)
{
resultString = "Data insertion failed and rollback failed because of an error";
e.printStackTrace();
}
}
finally
{
closeConnection();
}
return resultString;
}
由于以下错误，我从未设法插入任何内容
java.sql.SQLSyntaxErrorException: The number of values assigned is not the same as the number of specified or implied columns.
at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.Util.generateCsSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedConnection.handleException(Unknown Source)
at org.apache.derby.impl.jdbc.ConnectionChild.handleException(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedPreparedStatement.<init>(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedPreparedStatement20.<init>(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedPreparedStatement30.<init>(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedPreparedStatement40.<init>(Unknown Source)
at org.apache.derby.jdbc.Driver40.newEmbedPreparedStatement(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedConnection.prepareStatement(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedConnection.prepareStatement(Unknown Source)
at normal.DatabaseHandler.insertData(DatabaseHandler.java:56)
at normal.InsertForm$InsertDataAction.actionPerformed(InsertForm.java:385)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6504)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
at java.awt.Component.processEvent(Component.java:6269)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4860)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4686)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
at java.awt.Container.dispatchEventImpl(Container.java:2273)
at java.awt.Window.dispatchEventImpl(Window.java:2713)
at java.awt.Component.dispatchEvent(Component.java:4686)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:707)
at java.awt.EventQueue.access$000(EventQueue.java:101)
at java.awt.EventQueue$3.run(EventQueue.java:666)
at java.awt.EventQueue$3.run(EventQueue.java:664)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:680)
at java.awt.EventQueue$4.run(EventQueue.java:678)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:677)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
Caused by: java.sql.SQLException: The number of values assigned is not the same as the number of specified or implied columns.
at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(Unknown Source)
... 51 more
Caused by: ERROR 42802: The number of values assigned is not the same as the number of specified or implied columns.
at org.apache.derby.iapi.error.StandardException.newException(Unknown Source)
at org.apache.derby.impl.sql.compile.InsertNode.bindStatement(Unknown Source)
at org.apache.derby.impl.sql.GenericStatement.prepMinion(Unknown Source)
at org.apache.derby.impl.sql.GenericStatement.prepare(Unknown Source)
at org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.prepareInternalStatement(Unknown Source)
... 45 more
BUILD SUCCESSFUL (total time: 10 seconds)
为什么是这样？