idea 搭建springboot 并整合mybatis 并建立简单页面 进行简单的增删改查

idea上springboot的环境搭建整合mybatis 并进行简单的增删改查

1.新建项目 选择spring initializr

2.添加项目名称,组名称

3.选择默认的依赖

4.一路下一步

5.在resources增添配置项 application.properties

    spring.datasource.url = jdbc:mysql://localhost:3306/education?useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true&useSSL=false&serverTimezone=UTC
    #你的数据库名字
    spring.datasource.username = root
    #你的数据库密码
    spring.datasource.password = 123456
    spring.datasource.driverClassName = com.mysql.cj.jdbc.Driver
    #页面热加载
    spring.thymeleaf.cache = false

    #设置的默认端口号
    server.port = 8080

    #mapper.xml的位置
    mybatis.mapper-locations = classpath:mapper/*.xml
    #pojo的位置
    mybatis.type-aliases-package = com.wangqy.demo3.pojo

6.启动项目

启动项目显示无异常,OK!

7.做一个测试

建立如下队列的文件树.

代码如下

DemoController的代码:

    package com.wangqy.demo3.controller;

    import com.wangqy.demo3.pojo.User;
    import com.wangqy.demo3.service.DemoService;
    import com.wangqy.demo3.util.CusResult;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.CrossOrigin;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.ResponseBody;

    import javax.annotation.Resource;
    import java.util.List;

    @CrossOrigin(origins="*")
    @Controller
    @RequestMapping("/demo")

    public class DemoController {

        @Resource
        private DemoService demoService;

    //    @RequestMapping("/home")
    //    public String home(User user){
    //        return "index.html";
    //    }

        @RequestMapping("/add")
        @ResponseBody
        public CusResult add(User user){
            int result = 0 ;

            if (user.getId() == null || user.getIdentity() == null || user.getPassword() == null || user.getUsername() ==null){
                return CusResult.error(500 , "参数错误");
            }

            result = this.demoService.addUser(user);

            if (result == 1){
                return CusResult.ok("成功插入");
            }

            return CusResult.error(500 , "插入失败");
        }

        @RequestMapping("/delete")
        @ResponseBody
        public CusResult delete(User user){

            int result = 0;

            if (user.getId() == null ){
                return CusResult.error(500 , "参数错误");
            }

            result = this.demoService.deleteUser(user);
            if (result != 0){
                return CusResult.ok("成功删除");
            }
            return CusResult.error(500 , "删除失败");
        }

        /**
        *
        * @param user
        * @return
        *
        * 按照id更改内容
        */
        @RequestMapping("/update")
        @ResponseBody
        public CusResult update(User user){

            int result = 0;

            if (user.getId() == null){
                return CusResult.error(500 , "目标参数错误,可能原因:目标参数为空");
            }

            result = this.demoService.updateUser(user);

            if (result != 0){
                return CusResult.ok("修改内容成功");
            }

            return CusResult.error(500 ,"修改失败");
        }

        @RequestMapping("/select")
        @ResponseBody
        public CusResult select(){

            List<User> users = this.demoService.selectAll();

            for (User user:users
                ) {
                System.out.println(user.toString());
            }

            if (users.size() ==0 ){
                CusResult.error(500 , "查询结果不存在或服务器发生错误!");
            }

            return CusResult.ok(users);
        }

    }

UserMapper的代码如下:

    package com.wangqy.demo3.dao;

    import com.wangqy.demo3.pojo.User;
    import org.apache.ibatis.annotations.Mapper;

    import java.util.List;

    @Mapper
    public interface UserMapper {

        int deleteByPrimaryKey(Integer id);

        int insert(User record);

        List<User> selectAll();

        int updateByPrimaryKey(User record);
    }

User的代码如下:

    package com.wangqy.demo3.pojo;

    import java.io.Serializable;

    public class User implements Serializable {
        private Integer id;

        private String username;

        private String password;

        private String identity;

        public User(Integer id, String username, String password, String identity) {
            this.id = id;
            this.username = username;
            this.password = password;
            this.identity = identity;
        }

        public User() {
            super();
        }

        public Integer getId() {
            return id;
        }

        public void setId(Integer id) {
            this.id = id;
        }

        public String getUsername() {
            return username;
        }

        public void setUsername(String username) {
            this.username = username == null ? null : username.trim();
        }

        public String getPassword() {
            return password;
        }

        public void setPassword(String password) {
            this.password = password == null ? null : password.trim();
        }

        public String getIdentity() {
            return identity;
        }

        public void setIdentity(String identity) {
            this.identity = identity == null ? null : identity.trim();
        }

        @Override
        public String toString() {
            return "User{" +
                    "id=" + id +
                    ", username='" + username + '\'' +
                    ", password='" + password + '\'' +
                    ", identity='" + identity + '\'' +
                    '}';
        }
    }

UserExample的代码如下:

    package com.wangqy.demo3.pojo;

    import java.util.ArrayList;
    import java.util.List;

    public class UserExample {
        protected String orderByClause;

        protected boolean distinct;

        protected List<Criteria> oredCriteria;

        public UserExample() {
            oredCriteria = new ArrayList<Criteria>();
        }

        public void setOrderByClause(String orderByClause) {
            this.orderByClause = orderByClause;
        }

        public String getOrderByClause() {
            return orderByClause;
        }

        public void setDistinct(boolean distinct) {
            this.distinct = distinct;
        }

        public boolean isDistinct() {
            return distinct;
        }

        public List<Criteria> getOredCriteria() {
            return oredCriteria;
        }

        public void or(Criteria criteria) {
            oredCriteria.add(criteria);
        }

        public Criteria or() {
            Criteria criteria = createCriteriaInternal();
            oredCriteria.add(criteria);
            return criteria;
        }

        public Criteria createCriteria() {
            Criteria criteria = createCriteriaInternal();
            if (oredCriteria.size() == 0) {
                oredCriteria.add(criteria);
            }
            return criteria;
        }

        protected Criteria createCriteriaInternal() {
            Criteria criteria = new Criteria();
            return criteria;
        }

        public void clear() {
            oredCriteria.clear();
            orderByClause = null;
            distinct = false;
        }

        protected abstract static class GeneratedCriteria {
            protected List<Criterion> criteria;

            protected GeneratedCriteria() {
                super();
                criteria = new ArrayList<Criterion>();
            }

            public boolean isValid() {
                return criteria.size() > 0;
            }

            public List<Criterion> getAllCriteria() {
                return criteria;
            }

            public List<Criterion> getCriteria() {
                return criteria;
            }

            protected void addCriterion(String condition) {
                if (condition == null) {
                    throw new RuntimeException("Value for condition cannot be null");
                }
                criteria.add(new Criterion(condition));
            }

            protected void addCriterion(String condition, Object value, String property) {
                if (value == null) {
                    throw new RuntimeException("Value for " + property + " cannot be null");
                }
                criteria.add(new Criterion(condition, value));
            }

            protected void addCriterion(String condition, Object value1, Object value2, String property) {
                if (value1 == null || value2 == null) {
                    throw new RuntimeException("Between values for " + property + " cannot be null");
                }
                criteria.add(new Criterion(condition, value1, value2));
            }

            public Criteria andIdIsNull() {
                addCriterion("id is null");
                return (Criteria) this;
            }

            public Criteria andIdIsNotNull() {
                addCriterion("id is not null");
                return (Criteria) this;
            }

            public Criteria andIdEqualTo(Integer value) {
                addCriterion("id =", value, "id");
                return (Criteria) this;
            }

            public Criteria andIdNotEqualTo(Integer value) {
                addCriterion("id <>", value, "id");
                return (Criteria) this;
            }

            public Criteria andIdGreaterThan(Integer value) {
                addCriterion("id >", value, "id");
                return (Criteria) this;
            }

            public Criteria andIdGreaterThanOrEqualTo(Integer value) {
                addCriterion("id >=", value, "id");
                return (Criteria) this;
            }

            public Criteria andIdLessThan(Integer value) {
                addCriterion("id <", value, "id");
                return (Criteria) this;
            }

            public Criteria andIdLessThanOrEqualTo(Integer value) {
                addCriterion("id <=", value, "id");
                return (Criteria) this;
            }

            public Criteria andIdIn(List<Integer> values) {
                addCriterion("id in", values, "id");
                return (Criteria) this;
            }

            public Criteria andIdNotIn(List<Integer> values) {
                addCriterion("id not in", values, "id");
                return (Criteria) this;
            }

            public Criteria andIdBetween(Integer value1, Integer value2) {
                addCriterion("id between", value1, value2, "id");
                return (Criteria) this;
            }

            public Criteria andIdNotBetween(Integer value1, Integer value2) {
                addCriterion("id not between", value1, value2, "id");
                return (Criteria) this;
            }

            public Criteria andUsernameIsNull() {
                addCriterion("username is null");
                return (Criteria) this;
            }

            public Criteria andUsernameIsNotNull() {
                addCriterion("username is not null");
                return (Criteria) this;
            }

            public Criteria andUsernameEqualTo(String value) {
                addCriterion("username =", value, "username");
                return (Criteria) this;
            }

            public Criteria andUsernameNotEqualTo(String value) {
                addCriterion("username <>", value, "username");
                return (Criteria) this;
            }

            public Criteria andUsernameGreaterThan(String value) {
                addCriterion("username >", value, "username");
                return (Criteria) this;
            }

            public Criteria andUsernameGreaterThanOrEqualTo(String value) {
                addCriterion("username >=", value, "username");
                return (Criteria) this;
            }

            public Criteria andUsernameLessThan(String value) {
                addCriterion("username <", value, "username");
                return (Criteria) this;
            }

            public Criteria andUsernameLessThanOrEqualTo(String value) {
                addCriterion("username <=", value, "username");
                return (Criteria) this;
            }

            public Criteria andUsernameLike(String value) {
                addCriterion("username like", value, "username");
                return (Criteria) this;
            }

            public Criteria andUsernameNotLike(String value) {
                addCriterion("username not like", value, "username");
                return (Criteria) this;
            }

            public Criteria andUsernameIn(List<String> values) {
                addCriterion("username in", values, "username");
                return (Criteria) this;
            }

            public Criteria andUsernameNotIn(List<String> values) {
                addCriterion("username not in", values, "username");
                return (Criteria) this;
            }

            public Criteria andUsernameBetween(String value1, String value2) {
                addCriterion("username between", value1, value2, "username");
                return (Criteria) this;
            }

            public Criteria andUsernameNotBetween(String value1, String value2) {
                addCriterion("username not between", value1, value2, "username");
                return (Criteria) this;
            }

            public Criteria andPasswordIsNull() {
                addCriterion("password is null");
                return (Criteria) this;
            }

            public Criteria andPasswordIsNotNull() {
                addCriterion("password is not null");
                return (Criteria) this;
            }

            public Criteria andPasswordEqualTo(String value) {
                addCriterion("password =", value, "password");
                return (Criteria) this;
            }

            public Criteria andPasswordNotEqualTo(String value) {
                addCriterion("password <>", value, "password");
                return (Criteria) this;
            }

            public Criteria andPasswordGreaterThan(String value) {
                addCriterion("password >", value, "password");
                return (Criteria) this;
            }

            public Criteria andPasswordGreaterThanOrEqualTo(String value) {
                addCriterion("password >=", value, "password");
                return (Criteria) this;
            }

            public Criteria andPasswordLessThan(String value) {
                addCriterion("password <", value, "password");
                return (Criteria) this;
            }

            public Criteria andPasswordLessThanOrEqualTo(String value) {
                addCriterion("password <=", value, "password");
                return (Criteria) this;
            }

            public Criteria andPasswordLike(String value) {
                addCriterion("password like", value, "password");
                return (Criteria) this;
            }

            public Criteria andPasswordNotLike(String value) {
                addCriterion("password not like", value, "password");
                return (Criteria) this;
            }

            public Criteria andPasswordIn(List<String> values) {
                addCriterion("password in", values, "password");
                return (Criteria) this;
            }

            public Criteria andPasswordNotIn(List<String> values) {
                addCriterion("password not in", values, "password");
                return (Criteria) this;
            }

            public Criteria andPasswordBetween(String value1, String value2) {
                addCriterion("password between", value1, value2, "password");
                return (Criteria) this;
            }

            public Criteria andPasswordNotBetween(String value1, String value2) {
                addCriterion("password not between", value1, value2, "password");
                return (Criteria) this;
            }

            public Criteria andIdentityIsNull() {
                addCriterion("identity is null");
                return (Criteria) this;
            }

            public Criteria andIdentityIsNotNull() {
                addCriterion("identity is not null");
                return (Criteria) this;
            }

            public Criteria andIdentityEqualTo(String value) {
                addCriterion("identity =", value, "identity");
                return (Criteria) this;
            }

            public Criteria andIdentityNotEqualTo(String value) {
                addCriterion("identity <>", value, "identity");
                return (Criteria) this;
            }

            public Criteria andIdentityGreaterThan(String value) {
                addCriterion("identity >", value, "identity");
                return (Criteria) this;
            }

            public Criteria andIdentityGreaterThanOrEqualTo(String value) {
                addCriterion("identity >=", value, "identity");
                return (Criteria) this;
            }

            public Criteria andIdentityLessThan(String value) {
                addCriterion("identity <", value, "identity");
                return (Criteria) this;
            }

            public Criteria andIdentityLessThanOrEqualTo(String value) {
                addCriterion("identity <=", value, "identity");
                return (Criteria) this;
            }

            public Criteria andIdentityLike(String value) {
                addCriterion("identity like", value, "identity");
                return (Criteria) this;
            }

            public Criteria andIdentityNotLike(String value) {
                addCriterion("identity not like", value, "identity");
                return (Criteria) this;
            }

            public Criteria andIdentityIn(List<String> values) {
                addCriterion("identity in", values, "identity");
                return (Criteria) this;
            }

            public Criteria andIdentityNotIn(List<String> values) {
                addCriterion("identity not in", values, "identity");
                return (Criteria) this;
            }

            public Criteria andIdentityBetween(String value1, String value2) {
                addCriterion("identity between", value1, value2, "identity");
                return (Criteria) this;
            }

            public Criteria andIdentityNotBetween(String value1, String value2) {
                addCriterion("identity not between", value1, value2, "identity");
                return (Criteria) this;
            }
        }

        public static class Criteria extends GeneratedCriteria {

            protected Criteria() {
                super();
            }
        }

        public static class Criterion {
            private String condition;

            private Object value;

            private Object secondValue;

            private boolean noValue;

            private boolean singleValue;

            private boolean betweenValue;

            private boolean listValue;

            private String typeHandler;

            public String getCondition() {
                return condition;
            }

            public Object getValue() {
                return value;
            }

            public Object getSecondValue() {
                return secondValue;
            }

            public boolean isNoValue() {
                return noValue;
            }

            public boolean isSingleValue() {
                return singleValue;
            }

            public boolean isBetweenValue() {
                return betweenValue;
            }

            public boolean isListValue() {
                return listValue;
            }

            public String getTypeHandler() {
                return typeHandler;
            }

            protected Criterion(String condition) {
                super();
                this.condition = condition;
                this.typeHandler = null;
                this.noValue = true;
            }

            protected Criterion(String condition, Object value, String typeHandler) {
                super();
                this.condition = condition;
                this.value = value;
                this.typeHandler = typeHandler;
                if (value instanceof List<?>) {
                    this.listValue = true;
                } else {
                    this.singleValue = true;
                }
            }

            protected Criterion(String condition, Object value) {
                this(condition, value, null);
            }

            protected Criterion(String condition, Object value, Object secondValue, String typeHandler) {
                super();
                this.condition = condition;
                this.value = value;
                this.secondValue = secondValue;
                this.typeHandler = typeHandler;
                this.betweenValue = true;
            }

            protected Criterion(String condition, Object value, Object secondValue) {
                this(condition, value, secondValue, null);
            }
        }
    }

DemoService的代码如下:

    package com.wangqy.demo3.service;

    import com.wangqy.demo3.pojo.User;

    import java.util.List;


    public interface DemoService {

        List<User> selectAll();

        int addUser(User user);

        int updateUser(User user);

        int deleteUser(User user);
    }

DemoServiceImpl的代码如下:

    package com.wangqy.demo3.service.impl;

    import com.wangqy.demo3.dao.UserMapper;
    import com.wangqy.demo3.pojo.User;
    import com.wangqy.demo3.service.DemoService;
    import org.springframework.stereotype.Service;

    import javax.annotation.Resource;
    import java.util.List;

    @Service("DemoService")
    public class DemoServiceImpl implements DemoService {

        @Resource
        private UserMapper userMapper;


        @Override
        public List<User> selectAll() {
            return this.userMapper.selectAll();
        }

        @Override
        public int addUser(User user) {
            return this.userMapper.insert(user);
        }

        @Override
        public int updateUser(User user) {
            return this.userMapper.updateByPrimaryKey(user);
        }

        @Override
        public int deleteUser(User user) {
            return this.userMapper.deleteByPrimaryKey(user.getId());
        }
    }

UserMapper.xml的代码如下

    
    
    <mapper namespace="com.wangqy.demo3.dao.UserMapper">
    <resultMap id="BaseResultMap" type="com.wangqy.demo3.pojo.User">
        <constructor>
        <idArg column="id" javaType="java.lang.Integer" jdbcType="INTEGER" />
        <arg column="username" javaType="java.lang.String" jdbcType="VARCHAR" />
        <arg column="password" javaType="java.lang.String" jdbcType="VARCHAR" />
        <arg column="identity" javaType="java.lang.String" jdbcType="VARCHAR" />
        constructor>
    resultMap>
    <sql id="Example_Where_Clause">
        <where>
        <foreach collection="oredCriteria" item="criteria" separator="or">
            <if test="criteria.valid">
            <trim prefix="(" prefixOverrides="and" suffix=")">
                <foreach collection="criteria.criteria" item="criterion">
                <choose>
                    <when test="criterion.noValue">
                    and ${criterion.condition}
                    when>
                    <when test="criterion.singleValue">
                    and ${criterion.condition} #{criterion.value}
                    when>
                    <when test="criterion.betweenValue">
                    and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
                    when>
                    <when test="criterion.listValue">
                    and ${criterion.condition}
                    <foreach close=")" collection="criterion.value" item="listItem" open="(" separator=",">
                        #{listItem}
                    foreach>
                    when>
                choose>
                foreach>
            trim>
            if>
        foreach>
        where>
    sql>
    <sql id="Update_By_Example_Where_Clause">
        <where>
        <foreach collection="example.oredCriteria" item="criteria" separator="or">
            <if test="criteria.valid">
            <trim prefix="(" prefixOverrides="and" suffix=")">
                <foreach collection="criteria.criteria" item="criterion">
                <choose>
                    <when test="criterion.noValue">
                    and ${criterion.condition}
                    when>
                    <when test="criterion.singleValue">
                    and ${criterion.condition} #{criterion.value}
                    when>
                    <when test="criterion.betweenValue">
                    and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
                    when>
                    <when test="criterion.listValue">
                    and ${criterion.condition}
                    <foreach close=")" collection="criterion.value" item="listItem" open="(" separator=",">
                        #{listItem}
                    foreach>
                    when>
                choose>
                foreach>
            trim>
            if>
        foreach>
        where>
    sql>
    <sql id="Base_Column_List">
        id, username, password, identity
    sql>

    <select id="selectAll" resultMap="BaseResultMap">
        select * from users
    select>

    <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
        delete from users
        where id = #{id,jdbcType=INTEGER}
    delete>

    <insert id="insert" parameterType="com.wangqy.demo3.pojo.User">
        insert into users (id, username, password, 
        identity)
        values (#{id,jdbcType=INTEGER}, #{username,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR}, 
        #{identity,jdbcType=VARCHAR})
    insert>
    <update id="updateByPrimaryKey" parameterType="com.wangqy.demo3.pojo.User">
        update users
        set username = #{username,jdbcType=VARCHAR},
        password = #{password,jdbcType=VARCHAR},
        identity = #{identity,jdbcType=VARCHAR}
        where id = #{id,jdbcType=INTEGER}
    update>


    mapper>

数据库sql

    /*
    Navicat MySQL Data Transfer

    Source Server         : local
    Source Server Type    : MySQL
    Source Server Version : 50717
    Source Host           : 127.0.0.1:3306
    Source Schema         : education

    Target Server Type    : MySQL
    Target Server Version : 50717
    File Encoding         : 65001

    Date: 22/08/2019 09:37:59
    */

    SET NAMES utf8mb4;
    SET FOREIGN_KEY_CHECKS = 0;

    -- ----------------------------
    -- Table structure for users
    -- ----------------------------
    DROP TABLE IF EXISTS `users`;
    CREATE TABLE `users`  (
    `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '唯一id',
    `username` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '用户名',
    `password` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '密码',
    `identity` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '身份',
    PRIMARY KEY (`id`) USING BTREE,
    UNIQUE INDEX `users_id_uindex`(`id`) USING BTREE,
    UNIQUE INDEX `users_username_uindex`(`username`) USING BTREE
    ) ENGINE = InnoDB AUTO_INCREMENT = 101 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci COMMENT = '用户表' ROW_FORMAT = Dynamic;

    -- ----------------------------
    -- Records of users
    -- ----------------------------
    INSERT INTO `users` VALUES (3, 'Henry', '9608a82e5a0fb219ccb2', '普通会员');
    INSERT INTO `users` VALUES (4, 'Paul', '9608a82e5a0fb219ccb2', '管理员');
    INSERT INTO `users` VALUES (5, 'admin', '8cc96e98ab1ac80d9717', '管理员');
    INSERT INTO `users` VALUES (6, '哔哔哔', '9608a82e5a0fb219ccb2', '普通会员');
    INSERT INTO `users` VALUES (7, 'qq841557053', '0947d9755d4956e11b73', '普通会员');
    INSERT INTO `users` VALUES (100, '100', '100', '100');

    SET FOREIGN_KEY_CHECKS = 1;

8.运行 测试接口

9.建立一个简单的前端页面

    
    <html>
        <head>
            <meta charset="UTF-8">
            <title>title>
            <script src="http://libs.baidu.com/jquery/2.1.4/jquery.min.js">script>
        head>
        <body>
            select：
            <input type="button" value="查询" id="btn_2" onclick="query()"/>
            <input type="button" value="flush" id="btn_flush" onclick="flush()"/>
            <table id="queryResult" border="1px">
                <tr>
                    <td>idtd>
                    <td>usernametd>
                    <td>passwordtd>
                    <td>identtd>
                tr>
                <tr>
                    <td>td>
                    <td>td>
                    <td>td>
                    <td>td>
                tr>
            table>
            <br><br><br>
    ------------------------------		<br><br><br>
            id：<input type="text" value="" id="inno"/><br>
            username：<input type="text" value="" id="inusername"/><br>
            password：<input type="text" value="" id="inpassword"/><br>
            ident：<input type="text" value="" id="inident"/><br>
            <input type="button" value="插入" id="btn_1" onclick="submit()"/><br><br><br>
    ------------------------------		<br><br><br>
            输入id删除：<input type="text" value="" id="pno_del"/>
            <input type="button" value="删除" id="btn_3" onclick="del()"/><br><br><br>
    ------------------------------		<br><br><br>
            id：<input type="text" value="" id="upid"/><br>
            username：<input type="text" value="" id="upname"/><br>
            password：<input type="text" value="" id="uppwd"/><br>
            ident：<input type="text" value="" id="upident"/><br>
            <input type="button" value="update" id="btn_4" onclick="update()"/>
        body>
        
        <script type="text/javascript">

        function flush(){
            window.location.reload()
        }

        function submit() {
            var no = $("#inno").val();
            var username = $("#inusername").val();
            var password = $("#inpassword").val();
            var ident = $("#inident").val();
        
            var data={
                "id":no,
                "username":username,
                "password":password,
                "identity":ident,
            }
            
            
            $.ajax({
                type : "POST",
                url : "http://127.0.0.1:8080/demo/add",
                data : data,
                cache : true,
                async : true,
                success: function (data ,textStatus, jqXHR){
                    if(data.status == 200){
                        alert("插入成功了");
                    }else{
                        alert(data.data);
                    }
                },
                error:function (XMLHttpRequest, textStatus, errorThrown) {      
                    alert('错误信息'+ typeof(errorThrown) + textStatus);
                }
                
            });
        }
        
        
        function query() {
            var str = ["id","username","pasword","identi"];
            $.ajax({
                type : "post",
                url : "http://localhost:8080/demo/select",
                data : {
                },
                cache : true,
                async : true,
                success: function (data ,textStatus, jqXHR){

                    console.log(data.data)
                    for(var p in data.data){
                        console.log(data.data[p]);
                        var trHTML = ''+ data.data[p].id +''+data.data[p].username+''+data.data[p].password+''+data.data[p].identity+''
                        $("#queryResult").append(trHTML);
                    }

                },
                error:function (XMLHttpRequest, textStatus, errorThrown) {      
                
                    alert(typeof(errorThrown));
                }
                
            });
        }
        
        function del() {
            var pno = $("#pno_del").val();	
                
            $.ajax({
                type : "post",
                url : "http://127.0.0.1:8080/demo/delete",
                data : {
                    "id": pno
                },
                cache : true,
                async : true,
                success: function (data ,textStatus, jqXHR){
                    if(data.status == 200){
                        alert("删除成功了");
                    }else{
                        alert(data.data);
                    }
                },
                error:function (XMLHttpRequest, textStatus, errorThrown) {      
                
                    alert(typeof(errorThrown));
                }
                
            });
        }
        
        function update() {
            var id = $("#upid").val();
            var username = $("#upname").val();
            var password = $("#uppwd").val();
            var ident = $("#upident").val();
        
            var data={
                    
                "id":id,
                "username":username,
                "password":password,
                "identity":ident,

            }
            
            
            $.ajax({
                type : "post",
                url : "http://127.0.0.1:8080/demo/update",
                data : data,
                cache : true,
                async : true,
                success: function (data ,textStatus, jqXHR){
                    if(data.status == 200){
                        alert("更新成功了");
                    }else{
                        alert(data.data);
                    }
                },
                error:function (XMLHttpRequest, textStatus, errorThrown) {      
                
                    alert(typeof(errorThrown));
                }
                
            });
        }
            
            
            
        script>
    html>

测试ok 成功