/*This class is used to operate data base.
*The interface do_state value 0 is null pointer,-1 is data base error,1 is victory.
*Member variable indication:cur_page,total_page,size_page
*Member f
/*This class is used to operate data base.
*The interface do_state value 0 is null pointer,-1 is data base error,1 is victory.
*/
package bookutil;
import java.sql.*;
import java.util.ArrayList
/*This class is used to operate data base.
*The interface do_state value 0 is null pointer,-1 is data base error,1 is victory.
*/
package bookutil;
import java.sql.*;
import java.util.ArrayList
/*This class is used to operate data base.
*The interface do_state value 0 is null pointer,-1 is data base error,1 is victory.
*
*/
package bookutil;
import java.sql.*;
import java.util.Array
/*This class is used to operate data base.
*The interface do_state value 0 is null pointer,-1 is data base error,1 is victory.
*/
package bookutil;
import java.sql.*;
import java.util.ArrayList
/*This class is used to operate data base.
*The interface do_state value 0 is null pointer,-1 is data base error,1 is victory.
*/
package bookutil;
import java.sql.*;
import java.util.ArrayList
/*This class is used to operate data base.
*The interface do_state value 0 is null pointer,-1 is data base error,1 is victory.
*/
package bookutil;
import java.sql.*;
import java.util.ArrayList
/*This class is used to operate data base.
*The interface do_state value 0 is null pointer,-1 is data base error,1 is victory.
*
*/
package bookutil;
import java.sql.*;
import java.util.Array
/*This class is used to operate data base.
*The interface do_state value 0 is null pointer,-1 is data base error,1 is victory.
*
*/
package bookutil;
import java.sql.*;
import java.util.Array
/*This class is used to operate data base.
*The interface do_state value 0 is null pointer,-1 is data base error,1 is victory.
*/
package bookutil;
import java.sql.*;
import java.util.ArrayList
