调用Insert方法插入的name超过指定长度后，pst.executeUpdate()没有返回0

package com.liujia.service;

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.util.ArrayList;

import java.util.List;

import com.liujia.connectionjdbcutils.ConnectionUtil;

import com.liujia.course.Course;

public class Service {

public static boolean Insert(String name,String category,String desc) {

boolean flag=true;

Connection cnn=null;

PreparedStatement pst=null;

try {

cnn=ConnectionUtil.getConnection();

String sql="INSERT INTO course VALUES(null,?,?,?,now())";

pst=cnn.prepareStatement(sql);

pst.setString(1, name);

pst.setString(2, category);

pst.setString(3, desc);

int num=pst.executeUpdate();

System.out.println(num);

if(num>0) {

System.out.println("能正常插入数据库");

flag=true;

}else {

System.out.println("无法插入数据库");

flag=false;

}

}catch(Exception e) {

e.printStackTrace();

}finally {

ConnectionUtil.releas(cnn, pst);

}

return flag;

}

public static List getNews() {

List clist=new ArrayList();

Course course=new Course();

Connection cnn=null;

PreparedStatement pst=null;

ResultSet rs=null;

try {

String sql="SELECT*FROM course";

pst=cnn.prepareStatement(sql);

rs=pst.executeQuery();

while(rs.next()) {

int id=rs.getInt("id");

String name=rs.getString("name");

String category=rs.getString("category");

String desp=rs.getString("desp");

String ctime=rs.getString("createTime");

clist.add(new Course(id,name,category,desp, ctime));

}

}catch(Exception e) {

e.printStackTrace();

}finally {

ConnectionUtil.releas(cnn, pst,rs);

}

return clist;

}

}