次のコードをご覧ください
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");
}
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 int 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();
}
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();
}
}
}
このクラスは、埋め込まれたApachederbyデータベースにプログラムでテーブルを作成することができます。ただし、次のエラーが発生します
java.sql.SQLSyntaxErrorException: Syntax error: Encountered "identity" at line 1, column 32.
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.DatabaseCheck.<init>(DatabaseCheck.java:27)
at normal.MyPhoneBookApp.main(MyPhoneBookApp.java:25)
Caused by: java.sql.SQLException: Syntax error: Encountered "identity" at line 1, column 32.
at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(Unknown Source)
... 15 more
Caused by: ERROR 42X01: Syntax error: Encountered "identity" at line 1, column 32.
at org.apache.derby.iapi.error.StandardException.newException(Unknown Source)
at org.apache.derby.impl.sql.compile.ParserImpl.parseStatement(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)
... 9 more
テーブル作成コードから「identity」キーワードを削除すると、これは正常に機能します。ただし、IDの自動生成は必須です。助けてください!