Pivot implementation and redesign (#69)

- Pivot support implementation 
- Rename queries into inquiries
- Rename editor into workspace
- Change result set format
- New JSON format for inquiries
- Redesign panels

src/lib/database/_sql.js

@@ -4,6 +4,17 @@ import dbUtils from './_statements'
 let SQL = null
 const sqlModuleReady = initSqlJs().then(sqlModule => { SQL = sqlModule })
 
+function _getDataSourcesFromSqlResult (sqlResult) {
+  if (!sqlResult) {
+    return {}
+  }
+  const dataSorces = {}
+  sqlResult.columns.forEach((column, index) => {
+    dataSorces[column] = sqlResult.values.map(row => row[index])
+  })
+  return dataSorces
+}
+
 export default class Sql {
   constructor () {
     this.db = null
@@ -36,16 +47,19 @@ export default class Sql {
     if (!sql) {
       throw new Error('exec: Missing query string')
     }
-    return this.db.exec(sql, params)
+    const sqlResults = this.db.exec(sql, params)
+    return sqlResults.map(result => _getDataSourcesFromSqlResult(result))
   }
 
-  import (tabName, columns, values, progressCounterId, progressCallback, chunkSize = 1500) {
+  import (tabName, data, progressCounterId, progressCallback, chunkSize = 1500) {
     if (this.db === null) {
       this.createDb()
     }
-    this.db.exec(dbUtils.getCreateStatement(tabName, columns, values))
-    const chunks = dbUtils.generateChunks(values, chunkSize)
-    const chunksAmount = Math.ceil(values.length / chunkSize)
+    const columns = Object.keys(data)
+    const rowCount = data[columns[0]].length
+    this.db.exec(dbUtils.getCreateStatement(tabName, data))
+    const chunks = dbUtils.generateChunks(data, chunkSize)
+    const chunksAmount = Math.ceil(rowCount / chunkSize)
     let count = 0
     const insertStr = dbUtils.getInsertStmt(tabName, columns)
     const insertStmt = this.db.prepare(insertStr)

src/lib/database/_statements.js

@@ -1,13 +1,17 @@
 import sqliteParser from 'sqlite-parser'
 
 export default {
-  * generateChunks (arr, size) {
-    const count = Math.ceil(arr.length / size)
+  * generateChunks (data, size) {
+    const matrix = Object.keys(data).map(col => data[col])
+    const [row] = matrix
+    const transposedMatrix = row.map((value, column) => matrix.map(row => row[column]))
+
+    const count = Math.ceil(transposedMatrix.length / size)
 
     for (let i = 0; i <= count - 1; i++) {
       const start = size * i
       const end = start + size
-      yield arr.slice(start, end)
+      yield transposedMatrix.slice(start, end)
     }
   },
 
@@ -17,11 +21,11 @@ export default {
     return `INSERT INTO "${tabName}" (${colList}) VALUES (${params});`
   },
 
-  getCreateStatement (tabName, columns, values) {
+  getCreateStatement (tabName, data) {
     let result = `CREATE table "${tabName}"(`
-    columns.forEach((col, index) => {
-    // Get the first row of values to determine types
-      const value = values[0][index]
+    for (const col in data) {
+      // Get the first row of values to determine types
+      const value = data[col][0]
       let type = ''
       switch (typeof value) {
         case 'number': {
@@ -39,7 +43,8 @@ export default {
         default: type = 'TEXT'
       }
       result += `"${col}" ${type}, `
-    })
+    }
+
     result = result.replace(/,\s$/, ');')
     return result
   },

src/lib/database/_worker.js

@@ -15,8 +15,7 @@ function processMsg (sql) {
     case 'import':
       return sql.import(
         data.tabName,
-        data.columns,
-        data.values,
+        data.data,
         data.progressCounterId,
         postMessage
       )

src/lib/database/index.js

@@ -55,8 +55,7 @@ class Database {
   async addTableFromCsv (tabName, data, progressCounterId) {
     const result = await this.pw.postMessage({
       action: 'import',
-      columns: data.columns,
-      values: data.values,
+      data,
       progressCounterId,
       tabName
     })
@@ -89,11 +88,11 @@ class Database {
     const result = await this.execute(getSchemaSql)
     // Parse DDL statements to get column names and types
     const parsedSchema = []
-    if (result && result.values) {
-      result.values.forEach(item => {
+    if (result && result.name) {
+      result.name.forEach((table, index) => {
         parsedSchema.push({
-          name: item[0],
-          columns: stms.getColumns(item[1])
+          name: table,
+          columns: stms.getColumns(result.sql[index])
         })
       })
     }