Question

我现在已经对NextJS进行了一些修改，并尝试将getStaticProps和getStaticPaths的应用程序转换为使用{id.js拥有单独的文件夹（诸如pages / posts / [id] .js，/ pages / articles / [id] .js等）。由于保证这两个函数可以在服务器上运行，因此我选择将fetch db函数从我的公共API直接移到那些函数。因此，在我的[id].js文件中，我有这样的东西：

getStaticProps：

export async function getStaticProps({ params }) {
    let snowflake = require('snowflake-sdk')
    require('dotenv').config();
    let result = {};
    let id = params.id;

    const connection = snowflake.createConnection( {
        account: "account",
        username: "username",
        password: "password",
        warehouse: "warehouse"
    });
    
    console.log("Connecting to Snowflake...")
    await connection.connect( <- await doesn't seem to make a difference
        function(err, conn) {
            if (err) {
                console.error('Unable to connect: ' + err.message); <- This never outputs
            } 
            else {
                console.log('Successfully connected to Snowflake.'); <- Neither does this
            }
        }
    );

    await connection.execute({ <- await doesn't seem to make a difference
        sqlText: (`select stuff
                  from my_snowflake_db
                  where id=:1`),
        binds: [id],
        complete: function(err, stmt, data) {
            if (err) {
                console.error('Failed to execute statement due to the following error: ' + err.message);
            } else {
                result = data
                result["id"] = id
            }
        }
    })

    return {
        props: {
            result
        }
    }
}

getStaticPaths：

export async function getStaticPaths() {
    let snowflake = require('snowflake-sdk')
    require('dotenv').config();
    let paths = []

    const connection = snowflake.createConnection( {
        account: "account",
        username: "username",
        password: "password",
        warehouse: "warehouse"
    });
    
    console.log("Connecting to Snowflake...")
    await connection.connect( <- await doesn't seem to make a difference
        function(err, conn) {
            if (err) {
                console.error('Unable to connect: ' + err.message); <- This never outputs
            } 
            else {
                console.log('Successfully connected to Snowflake.'); <- Neither does this
            }
        }
    );

    await connection.execute({ <- await doesn't seem to make a difference
        sqlText: (`select id
                  from my_snowflake_db
                  where ...
                  `),
        complete: function(err, stmt, rows) {
            if (err) {
                console.error('Failed to execute statement due to the following error: ' + err.message); <- Never outputs
            } else {
                console.log("Got Response!") <- Never outputs
                for (var row in rows) {
                    console.log("Found id: " + row.id)
                    paths.push({
                        params: {
                            id: row.id
                        }
                    })
                }
            }
        }
    })

    console.log("Found paths: " + JSON.stringify(paths)) <- This outputs with an empty list

    return {
        paths,
        fallback: true
    }
}

当我使用npm run build构建应用程序时，我得到的只是Connecting to Snowflake...和Found paths: []，然后显然getStaticProps会中断，因为列表为空。我不确定为什么无法建立连接，或者为什么我什至没有得到错误或成功输出。我假设Snowflake如何异步连接存在一些问题，但是我不明白为什么在这种情况下“ await”关键字什么都不做。我可以添加或删除“等待”，结果完全一样。

Answer 1

NextJS依赖于NodeJS，因此按照Snowflake documentation的步骤进行操作，我从第一次尝试就开始使用它。

这是我的脚本：

async function connectToSnowflake(){
    let snowflake = require('snowflake-sdk');
    var connection = snowflake.createConnection({
        account: 'XXXXX',
        username: 'XXXXX',
        password: 'XXXXX' })
    await connection.connect(
        function(err,conn){
            if (err) {
                console.error('Unable to connect: ' + err.message);
            } else {
                console.log('Successfully connected');
                connection_ID = conn.getId();
                console.log(connection_ID);
            }
        }
    );
    await connection.execute({
        sqlText: 'select current_database()',
        complete: function(err,stmt, rows) {
            if (err) {
                console.error('Failed to execute statement due to the following error: ' + err.message);
            } else {
                console.log('Successfully executed statement: ' + stmt.getSqlText());
            }
        }
    });
}
connectToSnowflake();

运行此脚本，我得到：

[local@fedora nodejs]$ node connect_snowflake.js 
Successfully connected
90dfc5b0-a509-4d0a-8cfb-8022d02e8603
Successfully executed statement: select current_database()
[local@fedora nodejs]$

尝试相同的方法，看看是否可行。

在NextJS中使用Snowflake无法在getStaticPaths / getStaticProps中连接或执行查询

1 个答案: