I want to create my first project connected with the apache-derby.
public Circle getCircle(int circleId){
Connection conn = null;
try {
conn = dataSource.getConnection();
**PreparedStatement ps = (PreparedStatement) conn.prepareStatement("SELECT * FROM circle where id = ?");
((java.sql.PreparedStatement) ps).setInt(1,circleId);
Circle circle = null;
ResultSet rs = ((java.sql.PreparedStatement) ps).executeQuery();
if(rs.next()){
circle = new Circle(circleId,rs.getString("name"));
}**
rs.close();
((Connection) ps).close();
return circle;
}
catch (Exception e) {
throw new RuntimeException(e);
}
finally{
try{
conn.close();
}catch (SQLException e){}
}
}
public DataSource getDataSource() {
return dataSource;
}
public void setDataSource(DataSource dataSource) {
this.dataSource = dataSource;
}
}
dataSource is defined as bean in my .xml file. Using Spring or not i have an error connected with the prepared statement :
Exception in thread "main" java.lang.RuntimeException: java.lang.ClassCastException: org.apache.derby.client.am.ClientPreparedStatement42 cannot be cast to org.apache.derby.iapi.sql.PreparedStatement at JdbcDemo.dao.JdbcDaoImpl.getCircle(JdbcDaoImpl.java:42) at JdbcDemo.JdbcDemo.main(JdbcDemo.java:17) Caused by: java.lang.ClassCastException: org.apache.derby.client.am.ClientPreparedStatement42 cannot be cast to org.apache.derby.iapi.sql.PreparedStatement at JdbcDemo.dao.JdbcDaoImpl.getCircle(JdbcDaoImpl.java:30) ... 1 more
Could someone can help me ? I can add other class but i think probem is located in this class. I am using apache 10.12.1.1. Thank you for your help :)
It looks like you are using the wrong import for PreparedStatement. Your import should be:
import java.sql.PreparedStatement;
There should not be any import for org.apache.derby.iapi.sql.PreparedStatement, this is not something you should be using here.
You do not need any casts in your code:
PreparedStatement ps = conn.prepareStatement("SELECT * FROM circle where id = ?");
ps.setInt(1, circleId);
Circle circle = null;
ResultSet rs = ps.executeQuery();
Collected from the Internet
Please contact [email protected] to delete if infringement.
Comments