需要一些想法。
我正在尝试从nodejs应用程序将值插入两个表中，我想同时将数据插入两个表中，因为我将第二个表的列中的第一个表的ID用作父ID。 这是表结构
表1
export class Form extends Component {
constructor(props) {
super(props);
this.state = {
userInfo: {
name: '',
email: '',
phone: ''
},
errors: {}
};
this.handleInput = this.handleInput.bind(this);
this.handleSubmit = this.handleSubmit.bind(this);
}
handleInput(e) {
let fields = this.state.userInfo;
fields[e.target.name] = e.target.value;
this.setState({fields});
}
validateForm() {
let fields = this.state.userInfo;
let errors = {};
let formIsValid = true;
if (!fields["name"]) {
formIsValid = false;
errors["name"] = "*Please enter your name.";
}
if (typeof fields["name"] !== "undefined") {
if (!fields["name"].match(/^[a-zA-Z ]*$/)) {
formIsValid = false;
errors["name"] = "*Please enter alphabet characters only.";
}
}
if (!fields["email"]) {
formIsValid = false;
errors["email"] = "*Please enter your email.";
}
if (typeof fields["email"] !== "undefined") {
//regular expression for email validation
var pattern = new RegExp(/^(("[\w-\s]+")|([\w-]+(?:\.[\w-]+)*)|("[\w-\s]+")([\w-]+(?:\.[\w-]+)*))(@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$)|(@\[?((25[0-5]\.|2[0-4][0-9]\.|1[0-9]{2}\.|[0-9]{1,2}\.))((25[0-5]|2[0-4][0-9]|1[0-9]{2}|[0-9]{1,2})\.){2}(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[0-9]{1,2})\]?$)/i);
if (!pattern.test(fields["email"])) {
formIsValid = false;
errors["email"] = "*Please enter valid email.";
}
}
if (!fields["phone"]) {
formIsValid = false;
errors["phone"] = "*Please enter your phone.";
}
if (typeof fields["phone"] !== "undefined") {
if (!fields["phone"].match(/^[0-9]{10}$/)) {
formIsValid = false;
errors["phone"] = "*Please enter valid phone.";
}
}
this.setState({
errors: errors
});
return formIsValid;
}
handleSubmit(event) {
event.preventDefault();
if (this.validateForm()) {
let fields = {};
fields["name"] = "";
fields["email"] = "";
fields["phone"] = "";
this.setState({fields:fields});
alert("Form submitted");
}
let formData = {
name: this.state.userInfo.name,
emailAddress: this.state.userInfo.email,
phoneNumber: this.state.userInfo.phone
}
let fullname = this.state.userInfo.name.split(' ');
switch (fullname.length) {
case 1:
formData.firstname = fullname[0];
break;
case 2:
formData.firstname = fullname[0];
formData.lastname = fullname[1];
break;
case 3:
formData.firstname = fullname[0];
formData.lastname = fullname[2];
break;
default:
formData.firstname = fullname[0];
formData.lastname = fullname[2];
}
const json = JSON.stringify(formData);
fetch(submissionUrl, {
method: 'POST',
body: json,
headers: {
"Accept": "application/json",
"Content-Type": "application/json"
}
}).then(response => {
if (response.status >= 200 && response.status < 300) {
return response;
console.log(response);
window.location = 'www.someurl.com';
} else {
console.log('Somthing went wrong');
}
});
}
render() {
return (
<form onSubmit={this.handleSubmit} method="post">
<div>
<input
type="text"
name="name"
id="name"
placeholder="John Smith"
tabIndex="1"
minLength="2"
value={this.state.userInfo.name}
onChange={this.handleInput}
required="required"
/>
<span className="error">{this.state.errors.name}</span>
<label htmlFor="name">Full name*</label>
</div>
<div>
<input
type="text"
name="email"
id="email"
placeholder="john@company.com"
tabIndex="2"
minLength="5"
value={this.state.userInfo.email}
onChange={this.handleInput}
required="required"
/>
<span className="error">{this.state.errors.email}</span>
<label htmlFor="name">Email*</label>
</div>
<div>
<input
type="tel"
name="phone"
id="phone"
placeholder="(___)___-____"
tabIndex="3"
minLength="9"
value={this.state.userInfo.phone}
onChange={this.handleInput}
required="required"
/>
<span className="error">{this.state.errors.phone}</span>
<label htmlFor="name">Phone*</label>
</div>
<button id="submitBtn" type="submit">Submit Form</button>
</form>
)
}
表2：
Table “public.table1”
Column | Type | Collation | Nullable | Default
-------------+---------------+-----------+----------+---------------------------------------
id | integer | | not null | nextval(‘table1_id_seq’::regclass)
name | text | | not null |
description | character(50) | | |
Indexes:
“table1_pkey” PRIMARY KEY, btree (id)
我正在以UI的形式获取JSON值
Table “public.table2”
Column | Type | Collation | Nullable | Default
-------------+---------------+-----------+----------+-----------------------------------
id | integer | | not null | nextval(‘table2_id_seq’::regclass)
name | text | | not null |
parent_id | text | | not null |
sequence | integer | | not null |
description | character(50) | | |
我编写了以下查询，但出现以下错误：
{“table1”:{“name”:“test”,“description”:“test123”,“table2”:[{“column1”:“WMS”,“column2”:“WMS”,“column3”:2,“column4":“rtest”}]}}
错误：
WITH new_table1 AS(
INSERT INTO TABLE1
(id, name, description)
VALUES
(nextval('table_sequence'), 'BDO', 'Sample test') returning id
) INSERT INTO TABLE2(id,parent_id,name,sequence,description) (
nextval('table2_sequence'),
(select id from new_table1),
(select column1, column3, column4
from jsonb_to_recordset(
'[{"column1":"WMS","column2":"WMS","column3":2,"column4":"rtest","icon":"sap-icon://it-host"}]'
) r (column1 text, column2 text,column3 int, column4 text, icon text)) );
答案 0 :(得分：0)
错误的根源是，您只能在VALUES列表中使用标量表达式（返回单个列的子查询）（您也错过了该关键字）。您可以这样解决此问题：
WITH new_table1 AS (
INSERT INTO table1 (name, description)
VALUES ('BDO', 'Sample test') RETURNING id )
INSERT INTO table2 (parent_id, name, sequence, description)
SELECT id, column1, column3, column4
FROM new_table1,
jsonb_to_recordset (
'[{"column1":"WMS","column2":"WMS","column3":2,"column4":"rtest","icon":"sap-icon://it-host"}]'
) r (column1 text, column2 text,column3 int, column4 text, icon text);
解决方案在于使用带有INSERT语句而不是VALUES子句的查询。在查询中，将INSERT上的table1语句与jsonb_to_recordset()的输出合并。这是笛卡尔积，但是由于INSERT仅产生一行，所以没有问题。
还请注意，我已经删除了对id列及其序列的引用-默认值的优点是，插入时不必指定任何内容...