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} } return true; return false; else Boolean save(user user){ String sql=\Óû§±í values(?,?,?)\; String name=null,password=null;int account; state=conn.prepareStatement(sql); name=user.getName(); password=user.getName(); account=user.getAccount(); state.setNString(1, name); state.setNString(2, password); state.setInt(3, account); state.execute(); return true; int getSum(user user){ } Boolean change(user user,int sum){ String sql=\Óû§±í where name=?\; int account; state2=conn.prepareStatement(sql); if(find(user)==true){ state2.setNString(1,user.getName()); rs=state2.executeQuery(); rs.next(); account=rs.getInt(3); return account; }else return -1; String sql=\Óû§±í set account=account+? where name=?\; } if(find(user)==true){ String name=user.getName(); state3=conn.prepareStatement(sql); state3.setInt(1, sum); state3.setNString(2, name); return state3.execute(); else return false; } }

Boolean save(user user){

}

}

String sql=\Óû§±í values(?,?,?)\; String name=null,password=null;int account; state=conn.prepareStatement(sql); name=user.getName(); password=user.getName(); account=user.getAccount(); state.setNString(1, name); state.setNString(2, password); state.setInt(3, account); state.execute(); return true;

int getSum(user user){ }

Boolean change(user user,int sum){ }

String sql=\Óû§±í set account=account+? where name=?\; if(find(user)==true){ String name=user.getName();

state3=conn.prepareStatement(sql); state3.setInt(1, sum); state3.setNString(2, name); return state3.execute(); }

else return false;

String sql=\Óû§±í where name=?\; int account;

state2=conn.prepareStatement(sql); if(find(user)==true){ }

else return -1;

state2.setNString(1,user.getName()); rs=state2.executeQuery(); rs.next();

account=rs.getInt(3); return account;

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