通過knex插入假數據

Question

我想用faker通過knex將數據插入到我的postgresql數據庫中。

見最低下面的例子：

//Loading from an external file 
var knex = require('knex')({ 
    client: 'postgresql', 
    connection: { 
     database: 'knexdb', 
     user:  'root', 
     password: 'root' 
     }, 
    debug: false, 
}) 
// using faker 
const faker = require('faker') 

async function main() { 

    //test connection 
    await knex.raw('select 1+1 as result').then(function() { 
     console.log("valid db connection") 
     // there is a valid connection in the pool 
    }); 

    //delete data 
    await knex('posts').del().then(function() { 
     const res = knex('posts') 
     if (res) { 
      console.log("Table content deleted") 
     } else { 
      console.log(res) 
     } 
    }) 

    const dataAmount = 3 
    console.log("lets insert " + dataAmount + " rows of data") 
    for (var index = 0; index < dataAmount; index++) { 
     try { 
      await knex('posts').insert({ 
       title: faker.random.word, 
       description: faker.lorem.paragraph, 
       deleted: faker.random.boolean, 
       createdAt: faker.date.recent, 
       updatedAt: faker.date.recent 
      }) 
     } catch (e) { 
      console.log(e) 
     } 
    } 

    // select all 
    res = await knex('posts') 
    console.log('All: ', res) 

} 

main() //.then().catch(err => console.error(err)) 

我收到以下錯誤SELECT * with no tables specified is not valid。查看完整的輸出如下：

valid db connection Table content deleted insert 3 rows of data { error: SELECT * with no tables specified is not valid at Connection.parseE (C:\Users\user\Desktop\Coding Projects\learning_knex\node_modules\pg\lib\connection.js:546:11) at Connection.parseMessage (C:\Users\user\Desktop\Coding Projects\learning_knex\node_modules\pg\lib\connection.js:371:19) at Socket. (C:\Users\user\Desktop\Coding Projects\learning_knex\node_modules\pg\lib\connection.js:114:22) at emitOne (events.js:115:13) at Socket.emit (events.js:210:7) at addChunk (_stream_readable.js:266:12) at readableAddChunk (_stream_readable.js:253:11) at Socket.Readable.push (_stream_readable.js:211:10) at TCP.onread (net.js:585:20) name: 'error', length: 117, severity: 'ERROR', code: '42601', detail: undefined, hint: undefined, position: '99', internalPosition: undefined, internalQuery: undefined, where: undefined, schema: undefined, table: undefined, column: undefined, dataType: undefined, constraint: undefined, file: 'parse_target.c', line: '1211', routine: 'ExpandAllTables' } { error: SELECT * with no tables specified is not valid at Connection.parseE (C:\Users\user\Desktop\Coding Projects\learning_knex\node_modules\pg\lib\connection.js:546:11) at Connection.parseMessage (C:\Users\user\Desktop\Coding Projects\learning_knex\node_modules\pg\lib\connection.js:371:19) at Socket. (C:\Users\user\Desktop\Coding Projects\learning_knex\node_modules\pg\lib\connection.js:114:22) at emitOne (events.js:115:13) at Socket.emit (events.js:210:7) at addChunk (_stream_readable.js:266:12) at readableAddChunk (_stream_readable.js:253:11) at Socket.Readable.push (_stream_readable.js:211:10) at TCP.onread (net.js:585:20) name: 'error', length: 117, severity: 'ERROR', code: '42601', detail: undefined, hint: undefined, position: '99', internalPosition: undefined, internalQuery: undefined, where: undefined, schema: undefined, table: undefined, column: undefined, dataType: undefined, constraint: undefined, file: 'parse_target.c', line: '1211', routine: 'ExpandAllTables' } { error: SELECT * with no tables specified is not valid at Connection.parseE (C:\Users\user\Desktop\Coding Projects\learning_knex\node_modules\pg\lib\connection.js:546:11) at Connection.parseMessage (C:\Users\user\Desktop\Coding Projects\learning_knex\node_modules\pg\lib\connection.js:371:19) at Socket. (C:\Users\user\Desktop\Coding Projects\learning_knex\node_modules\pg\lib\connection.js:114:22) at emitOne (events.js:115:13) at Socket.emit (events.js:210:7) at addChunk (_stream_readable.js:266:12) at readableAddChunk (_stream_readable.js:253:11) at Socket.Readable.push (_stream_readable.js:211:10) at TCP.onread (net.js:585:20) name: 'error', length: 117, severity: 'ERROR', code: '42601', detail: undefined, hint: undefined, position: '99', internalPosition: undefined, internalQuery: undefined, where: undefined, schema: undefined, table: undefined, column: undefined, dataType: undefined, constraint: undefined, file: 'parse_target.c', line: '1211', routine: 'ExpandAllTables' } All: [] ^C C:\Users\user\Desktop\Coding Projects\learning_knex\src>node t3-faker.js valid db connection Table content deleted lets insert 3 rows of data { error: SELECT * with no tables specified is not valid at Connection.parseE (C:\Users\user\Desktop\Coding Projects\learning_knex\node_modules\pg\lib\connection.js:546:11) at Connection.parseMessage (C:\Users\user\Desktop\Coding Projects\learning_knex\node_modules\pg\lib\connection.js:371:19) at Socket. (C:\Users\user\Desktop\Coding Projects\learning_knex\node_modules\pg\lib\connection.js:114:22) at emitOne (events.js:115:13) at Socket.emit (events.js:210:7) at addChunk (_stream_readable.js:266:12) at readableAddChunk (_stream_readable.js:253:11) at Socket.Readable.push (_stream_readable.js:211:10) at TCP.onread (net.js:585:20) name: 'error', length: 117, severity: 'ERROR', code: '42601', detail: undefined, hint: undefined, position: '99', internalPosition: undefined, internalQuery: undefined, where: undefined, schema: undefined, table: undefined, column: undefined, dataType: undefined, constraint: undefined, file: 'parse_target.c', line: '1211', routine: 'ExpandAllTables' } { error: SELECT * with no tables specified is not valid at Connection.parseE (C:\Users\user\Desktop\Coding Projects\learning_knex\node_modules\pg\lib\connection.js:546:11) at Connection.parseMessage (C:\Users\user\Desktop\Coding Projects\learning_knex\node_modules\pg\lib\connection.js:371:19) at Socket. (C:\Users\user\Desktop\Coding Projects\learning_knex\node_modules\pg\lib\connection.js:114:22) at emitOne (events.js:115:13) at Socket.emit (events.js:210:7) at addChunk (_stream_readable.js:266:12) at readableAddChunk (_stream_readable.js:253:11) at Socket.Readable.push (_stream_readable.js:211:10) at TCP.onread (net.js:585:20) name: 'error', length: 117, severity: 'ERROR', code: '42601', detail: undefined, hint: undefined, position: '99', internalPosition: undefined, internalQuery: undefined, where: undefined, schema: undefined, table: undefined, column: undefined, dataType: undefined, constraint: undefined, file: 'parse_target.c', line: '1211', routine: 'ExpandAllTables' } { error: SELECT * with no tables specified is not valid at Connection.parseE (C:\Users\user\Desktop\Coding Projects\learning_knex\node_modules\pg\lib\connection.js:546:11) at Connection.parseMessage (C:\Users\user\Desktop\Coding Projects\learning_knex\node_modules\pg\lib\connection.js:371:19) at Socket. (C:\Users\user\Desktop\Coding Projects\learning_knex\node_modules\pg\lib\connection.js:114:22) at emitOne (events.js:115:13) at Socket.emit (events.js:210:7) at addChunk (_stream_readable.js:266:12) at readableAddChunk (_stream_readable.js:253:11) at Socket.Readable.push (_stream_readable.js:211:10) at TCP.onread (net.js:585:20) name: 'error', length: 117, severity: 'ERROR', code: '42601', detail: undefined, hint: undefined, position: '99', internalPosition: undefined, internalQuery: undefined, where: undefined, schema: undefined, table: undefined, column: undefined, dataType: undefined, constraint: undefined, file: 'parse_target.c', line: '1211', routine: 'ExpandAllTables' } All: []

任何建議我做錯了嗎？

Answer 1

你混合承諾和異步/的await這使得代碼難以閱讀和你做也有一些錯誤存在，也許這並您正在做什麼：

//Loading from an external file 
var knex = require('knex')({ 
    client: 'postgresql', 
    connection: { 
     database: 'knexdb', 
     user:  'root', 
     password: 'root' 
    }, 
    debug: false, 
}) 
// using faker 
const faker = require('faker') 

async function main() { 

    //test connection 
    await knex.raw('select 1+1 as result'); 
    console.log("valid db connection"); 

    //delete data 
    await knex('posts').del(); 
    const res = await knex('posts'); // FIXED: this was missing await 
    if (res.length === 0) {   // FIXED: also empty array is truthy 
     console.log("Table content deleted"); 
    } else { 
     console.log(res); 
    } 

    const dataAmount = 3 
    console.log(`lets insert ${dataAmount} rows of data`); 
    for (let index = 0; index < dataAmount; index++) { 
     try { 
      // FIXED: faker calls were missing() from the end 
      await knex('posts').insert({ 
       title: faker.random.word(), 
       description: faker.lorem.paragraph(), 
       deleted: faker.random.boolean(), 
       createdAt: faker.date.recent(), 
       updatedAt: faker.date.recent() 
      }); 
     } catch (e) { 
      console.log(e); 
     } 
    } 

    // select all 
    let finalRes = await knex('posts'); 
    console.log('All: ', finelRes); 
} 

main().then().catch(err => console.error(err)); 

我想這SELECT *沒有表錯誤是由於某種原因造成的，因爲你試圖將函數寫入數據庫而不是值。