我正在尝试填充用户提交的表单的敌人下拉菜单，以向“反派”实体添加详细信息。到目前为止，在后端，看起来像当我进入表单时，所有的属性都正确地加载到了实体中，除了没有下拉菜单的敌人属性。
英雄实体已插入数据，因此下拉列表应填充，但不是。任何想法？
在终端上运行程序时遇到的错误是...。
{“代码”：“ ER_BAD_NULL_ERROR”，“ errno”：1048，“ sqlMessage”：“列'enemy'不能为空”，“ sqlState”：“ 23000”，“索引”：0，“ sql”： “插入反派（vfirstName，vlastName，vspecies，vage，valias，敌人）值（'Loki'，'Laufeyson'，'God'，'1000'，'Loki'，NULL）“]
/ * ------------------------------------------功能- ---------------------------------------- * /
module.exports = function(){
var express = require('express');
var router = express.Router();
/* FUNCTION TO GET ALL HEROES FOR THE ENEMY MENU DROPDOWN */
function getHeroes(res, mysql, context, complete){
mysql.pool.query("SELECT hero_id AS id, alias FROM Heroes", function(error, results, fields){
if(error){
console.log(JSON.stringify(error));
res.write(JSON.stringify(error));
res.end();
}
context.heroes = results;
complete();
});
}
/* FUNCTION TO GET ALL VILLAINS TO DISPLAY */
function getVillains(res, mysql, context, complete){
mysql.pool.query("SELECT villain_id AS id, vfirstName, vlastName, vspecies, vage, valias, Heroes.alias AS enemy FROM Villains INNER JOIN Heroes ON enemy = Heroes.hero_id", function(error, results, fields){
if(error){
console.log(JSON.stringify(error));
res.write(JSON.stringify(error));
res.end();
}
context.villains = results;
complete();
});
}
/* FUNCTION TO GET VILLAIN BY ENEMY */
function getVillainByEnemy(res, mysql, context, complete) {
var query = "SELECT Villains.villain_id AS id, vfirstName, vlastName, vspecies, vage, valias, Heroes.alias AS enemy FROM Villains INNER JOIN Heroes ON enemy = Heroes.hero_id WHERE Villains.enemy = ?";
console.log(req.params)
var inserts = [req.params.enemy]
mysql.pool.query(query, inserts, function(error, results, fields) {
if(error) {
console.log(JSON.stringify(error));
res.write(JSON.stringify(error));
res.end();
}
context.villains = results;
complete();
});
}
/* FUNCTION TO GET VILLAIN ALIAS*/
function getVillainWithAliasLike(res, mysql, context, complete) {
var query = "SELECT Villains.villain_id AS id, vfirstName, vlastName, vspecies, vage, valias, Heroes.alias AS enemy FROM Villains INNER JOIN Heroes ON enemy = Heroes.hero_id WHERE Villains.valias LIKE " + mysql.pool.escape(req.params.s + '%');
console.log(query)
mysql.pool.query(query, function(error, results, fields){
if(error) {
console.log(JSON.stringify(error));
res.write(JSON.stringify(error));
res.end();
}
context.villains = results;
complete();
});
}
/* FUNCTION TO GET ONE, SINGLE HERO */
function getVillain(res, mysql, context, id, complete) {
var sql = "SELECT villain_id AS id, vfirstName, vlastName, vspecies, vage, valias, enemy FROM Villains WHERE villain_id = ?";
var inserts =[id];
mysql.pool.query(sql, inserts, function(error, results, fields){
if(error){
console.log(JSON.stringify(error));
res.write(JSON.stringify(error));
res.end();
}
context.villain = results[0];
complete();
});
}
/ * ------------------------------------------路由器- ---------------------------------------- * /
/* ROUTER TO DISPLAY VILLAINS */
router.get('/', function(req, res) {
var callbackCount = 0;
var context = {};
context.jsscripts = ["deleteVillain.js"];
var mysql = req.app.get('mysql');
getHeroes(res, mysql, context, complete);
getVillains(res, mysql, context, complete);
function complete() {
callbackCount++;
if(callbackCount >= 2) {
res.render('villains', context);
}
}
});
/* ROUTER TO DISPLAY HEROES FOR SEARCH */
router.get('/search/:s', function(req, res){
var callbackCount = 0;
var context = {};
context.jsscripts = ["deleteVillain.js"];
var mysql = req.app.get('mysql');
getVillainsWithAliasLike(req, res, mysql, context, complete);
getHeroes(res, mysql, context, complete);
function complete() {
callbackCount++;
if(callbackCount >= 2) {
res.render('villains', context);
}
}
});
/* ROUTER TO DISPLAY ONE VILLAIN TO UPDATE */ //FIX//
router.get('/:id', function(req, res){
callbackCount = 0;
var context = {};
context.jsscripts = ["selectedHero.js", "updateVillain.js"];
var mysql = req.app.get('mysql');
getVillain(res, mysql, context, req.params.villain_id, complete);
getHeroes(res, mysql, context, complete);
function complete(){
callbackCount++;
if(callbackCount >= 2){
//FIX
res.render('update-villain', context);
}
}
});
/* ROUTER TO ADD NEW VILLAIN */
router.post('/', function(req, res) {
console.log(req.body.enemy);
console.log(req.body);
var mysql = req.app.get('mysql');
var sql = "INSERT INTO Villains(vfirstName, vlastName, vspecies, vage, valias, enemy) VALUES (?, ?, ?, ?, ?, ?)";
var inserts = [req.body.vfirstName, req.body.vlastName, req.body.vspecies, req.body.vage, req.body.valias, req.body.enemy];
sql = mysql.pool.query(sql, inserts, function (error, results, fields) {
if(error) {
console.log(JSON.stringify(error));
res.write(JSON.stringify(error));
res.end;
} else {
console.log("VILLAIN ADDED TO THE DATABASE");
res.redirect('/villains')
}
});
});
/* THE URI THAT UPDATES DATA SENT TO UPDATE THE HERO */
router.put('/:id', function(req, res) {
var mysql = req.app.get('mysql');
var sql = "UPDATE Villains SET vfirstName = ?, vlastName = ? vspecies = ?, vage = ?, valias = ?, enemy = ? WHERE villain_id = ?";
var inserts = [req.body.vfirstName, req.body.vlastName, req.body.vspecies, req.body.vage, req.body.valias, req.body.venemy, req.params.id];
sql = mysql.pool.query(sql, inserts, function(error, results, fields) {
if(error) {
res.write(JSON.stringify(error));
res.end();
} else {
res.status(200);
res.end();
console.log("Updated Villain");
}
});
});
/* ROUTER TO DELETE HERO */
router.delete('/:id', function(req, res) {
var mysql = req.app.get('mysql');
var sql = "DELETE FROM Villains WHERE villain_id = ?";
var inserts = [req.params.id];
sql = mysql.pool.query(sql, inserts, function (error, results, fields){
if(error) {
console.log(error);
res.write(JSON.stringify(error));
res.status(400);
res.end();
}else {
res.status(202);
console.log("DELETE CONFIRMED");
res.end();
}
});
}); return router; }();
* / ------------- HTML HANDLEBAR ------------- * /
{{#each foo}}
{{this}}
{{/each}}
<!-- Add New Villains -->
<h3>Add new villain:</h3>
<form id="add_villain" action="/villains" method="post">
First name: <input type="text" name="vfirstName"><br>
Last name: <input type="text" name="vlastName"><br>
Species: <input type="text" name="vspecies"><br>
Age: <input type="number" name="vage"><br>
Alias: <input type="text" name="valias"><br>
Enemy: <select name="enemy">
{{#each enemy}}
<option value="{{id}}">{{alias}}</option>
{{/each}}
</select><br>
<input type="submit" value="Submit">
</form>
<!-- Search Heroes -->
<div>
<form id="search_heroes" action="/heroes" method="get">
<label> Search hero for alias starting with:</label>
<input id="searchvillain" type="text" name="alias">
<input type = "Submit">
</form>
</div>
<!-- Current Heroes -->
<div>
<h3>Current villains:</h3>
<table>
<thead>
<tr><th>First Name</th>
<th>Last Name</th>
<th>Species</th>
<th>Age</th>
<th>Alias</th>
<th>Enemy</th>
</tr></thead>
{{#each villains}}
<tbody><tr>
<td>{{vfirstName}}</td>
<td>{{vlastName}}</td>
<td>{{vspecies}}</td>
<td>{{vage}}</td>
<td>{{valias}}</td>
<td>{{enemy}}</td>
<td><button onclick="deleteVillain({{id}})">Delete</button></td>
<td><a href="/villains/{{id}}">Update</a></td>
</tr>
{{/each}}
</tbody>
</table>
</div>
表格
CREATE TABLE `Heroes` (
`hero_id` INT(20) AUTO_INCREMENT NOT NULL,
`firstName` VARCHAR(20) NOT NULL,
`lastName` VARCHAR(20) DEFAULT NULL,
`species` VARCHAR(50) NOT NULL,
`age` BIGINT(20) DEFAULT NULL,
`alias` VARCHAR(20) DEFAULT NULL,
`loveInterest` VARCHAR(50) DEFAULT NULL,
`homePlanet` INT(9) NOT NULL,
PRIMARY KEY (`hero_id`),
FOREIGN KEY (`homePlanet`) REFERENCES `Planets`(`planet_id`) ON UPDATE
CASCADE ON DELETE CASCADE
)Engine=InnoDB DEFAULT CHARSET=latin1;
/* Create Villains table */
CREATE TABLE `Villains` (
`villain_id` INT(9) AUTO_INCREMENT NOT NULL,
`vfirstName` VARCHAR(20),
`vlastName` VARCHAR(20) DEFAULT NULL,
`vspecies` VARCHAR(50) NOT NULL,
`vage` BIGINT(20) DEFAULT NULL,
`valias` VARCHAR(20) DEFAULT NULL,
`enemy` INT(9) NOT NULL,
PRIMARY KEY (`villain_id`),
FOREIGN KEY (`enemy`) REFERENCES `Heroes`(`hero_id`) ON UPDATE CASCADE ON DELETE CASCADE
)Engine=INNODB DEFAULT CHARSET=latin1;