troubleshooting Question

h2 database issue in java

Avatar of jazzIIIlove
jazzIIIloveFlag for Sweden asked on
DatabasesJava
4 Comments2 Solutions2545 ViewsLast Modified:
Hi;

I write the following code to test a simple h2 database and table, but failed. Code is as follows:

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

public class H2Example {  
    public static void main(String[] args) {  
  
        Connection connection = null;  
        ResultSet resultSet = null;  
        Statement statement = null;  
  
        try {  
            Class.forName("org.h2.Driver");  
            connection = DriverManager.getConnection(  
                    "jdbc:h2:C:\\H2DB\\database\\EMPLOYEEDB", "sa", "");  
            statement = connection.createStatement();  
            resultSet = statement  
                    .executeQuery("SELECT EMPNAME FROM EMPLOYEEDETAILS");  
            while (resultSet.next()) {  
                System.out.println("EMPLOYEE NAME:"  
                        + resultSet.getString("EMPNAME"));  
            }  
        } catch (Exception e) {  
            e.printStackTrace();  
        } finally {  
            try {  
                resultSet.close();  
                statement.close();  
                connection.close();  
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
        }  
    }  
}  

The latest jar is in buildpath in my eclipse. The path for db is as C:\H2DB\database\EMPLOYEEDB.h2

The error is as follows:

org.h2.jdbc.JdbcSQLException: Table "EMPLOYEEDETAILS" not found; SQL statement:
SELECT EMPNAME FROM EMPLOYEEDETAILS [42102-174]
	at org.h2.message.DbException.getJdbcSQLException(DbException.java:332)
	at org.h2.message.DbException.get(DbException.java:172)
	at org.h2.message.DbException.get(DbException.java:149)
	at org.h2.command.Parser.readTableOrView(Parser.java:4942)
	at org.h2.command.Parser.readTableFilter(Parser.java:1159)
	at org.h2.command.Parser.parseSelectSimpleFromPart(Parser.java:1766)
	at org.h2.command.Parser.parseSelectSimple(Parser.java:1874)
	at org.h2.command.Parser.parseSelectSub(Parser.java:1760)
	at org.h2.command.Parser.parseSelectUnion(Parser.java:1602)
	at org.h2.command.Parser.parseSelect(Parser.java:1590)
	at org.h2.command.Parser.parsePrepared(Parser.java:418)
	at org.h2.command.Parser.parse(Parser.java:290)
	at org.h2.command.Parser.parse(Parser.java:262)
	at org.h2.command.Parser.prepareCommand(Parser.java:227)
	at org.h2.engine.Session.prepareLocal(Session.java:437)
	at org.h2.engine.Session.prepareCommand(Session.java:380)
	at org.h2.jdbc.JdbcConnection.prepareCommand(JdbcConnection.java:1138)
	at org.h2.jdbc.JdbcStatement.executeQuery(JdbcStatement.java:72)
	at H2Example.main(H2Example.java:23)
java.lang.NullPointerException
	at H2Example.main(H2Example.java:32)

The table is there as seen in the screenshot.

Regards.
h2.jpg
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