如何使用node-postgres将多行正确插入PG？ [英] How do I properly insert multiple rows into PG with node-postgres?

问题描述

可以像这样插入一行：

client.query("insert into tableName (name, email) values ($1, $2) ", ['john', '[e-mail]'], callBack)

这种方法会自动注释掉任何特殊字符。

This approach automatically comments out any special characters.

如何一次插入多行？

我需要实现这一点：

"insert into tableName (name, email) values ('john', '[e-mail]'), ('jane', '[e-mail]')"

我只能使用js字符串运算符手动编译此类行，但随后我需要以某种方式添加特殊字符转义符。

I can just use js string operators to compile such rows manually, but then i need to add special characters escape somehow.

推荐答案

以下文章： 性能增强来自 pg-promise 库及其建议的方法：

Following this article: Performance Boost from pg-promise library, and its suggested approach:

// Concatenates an array of objects or arrays of values, according to the template,
// to use with insert queries. Can be used either as a class type or as a function.
//
// template = formatting template string
// data = array of either objects or arrays of values
function Inserts(template, data) {
    if (!(this instanceof Inserts)) {
        return new Inserts(template, data);
    }
    this._rawDBType = true;
    this.formatDBType = function () {
        return data.map(d=>'(' + pgp.as.format(template, d) + ')').join(',');
    };
}

与您的情况完全相同的使用示例：

An example of using it, exactly as in your case:

var users = [['John', 23], ['Mike', 30], ['David', 18]];

db.none('INSERT INTO Users(name, age) VALUES $1', Inserts('$1, $2', users))
    .then(data=> {
        // OK, all records have been inserted
    })
    .catch(error=> {
        // Error, no records inserted
    });

它也适用于一系列对象：

And it will work with an array of objects as well:

var users = [{name: 'John', age: 23}, {name: 'Mike', age: 30}, {name: 'David', age: 18}];

db.none('INSERT INTO Users(name, age) VALUES $1', Inserts('${name}, ${age}', users))
    .then(data=> {
        // OK, all records have been inserted
    })
    .catch(error=> {
        // Error, no records inserted
    });

UPDATE-1

有关通过单个 INSERT 查询的高性能方法，请参见具有pg-promise的多行插入。

For a high-performance approach via a single INSERT query see Multi-row insert with pg-promise.

UPDATE-2

这里的信息现在已经很旧了，请参见自定义类型格式。以前是 _rawDBType 的现在是 rawType 和 formatDBType 被重命名为 toPostgres 。

The information here is quite old now, see the latest syntax for Custom Type Formatting. What used to be _rawDBType is now rawType, and formatDBType was renamed into toPostgres.

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