Press n or j to go to the next uncovered block, b, p or k for the previous block.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 | import neatCsv from "neat-csv"; import sqlstring from "sqlstring"; import { ReadStream } from "fs"; import StreamCleaner, { MATCH_NON_PRINTABLE } from "StreamCleaner"; import { Readable } from "stream"; export { MATCH_NON_PRINTABLE } from "StreamCleaner"; interface ParserArgs { numericColumns?: Array<string>; maxChars?: number; escapeChar?: string; progressCallback?: ProgressCallback; columnTransformers?: ColumnTransformers; filterInput?: boolean | RegExp; } interface MapValuesArgs { header: string; value: any; } type ColumnTransformers = { [key: string]: (value: string) => string }; type StatementExecutor = (statement: string) => Promise<any>; function createValueMapper( numericColumns: Array<string>, columnTransformers: ColumnTransformers ) { return (args: MapValuesArgs) => { let value = args.value; if (columnTransformers[args.header]) { value = columnTransformers[args.header](value); } if (numericColumns?.indexOf(args.header) >= 0) { return value; } return value === "NULL" ? "NULL" : sqlstring.escape(value); }; } function createExecutor( uploader: StatementExecutor, progressCallback: ProgressCallback, tableName: string, totalRows: number ) { return async (statement: string, rowCount: number) => { try { await uploader(statement); progressCallback((rowCount / totalRows) * 100, tableName); } catch (ex) { console.error(`Error executing ${statement}`); throw new Error(ex.message); } }; } type ProgressCallback = (progress: number, tableName: string) => void; const DefaultProgressCallback: ProgressCallback = ( progress: number, tableName: string ) => console.error(`${progress.toFixed(2)}% of records uploaded to ${tableName}`); function createNewValuesStatement( columns: string[], entry: any ): string | undefined { const columnData = columns .map(key => entry[key]) .map(value => (value === undefined ? "NULL" : value)); if (!columnData.find(x => x !== "NULL")) { return; } return `(${columnData.join(",")})`; } const createInsertStatement = (table_name: string, columns: string[]) => `INSERT INTO ${sqlstring.escapeId(table_name)} (${columns .map(column_name => sqlstring.escapeId(column_name)) .join(",")}) VALUES `; export const CsvInsert = function( uploader: StatementExecutor, settings?: ParserArgs ) { const columnTransformers = settings?.columnTransformers ?? {}; const mapValues = createValueMapper( settings?.numericColumns ?? [], columnTransformers ); const progressCallback = settings?.progressCallback ?? DefaultProgressCallback; const MAX_CHARS = settings?.maxChars ?? 64000; const escapeChar = settings?.escapeChar ?? "\\"; return async (readStream: ReadStream, table_name: string) => { let sourceStream: Readable = readStream; if (settings.filterInput) { const filter = settings.filterInput === true ? MATCH_NON_PRINTABLE : settings.filterInput; sourceStream = sourceStream.pipe(new StreamCleaner(filter)); } const data = await neatCsv(sourceStream, { mapValues, escape: escapeChar }); const columns = Object.keys(data[0]); let insertStart = createInsertStatement(table_name, columns); let statement = ""; let idx = 0; const executeStatement = createExecutor( uploader, progressCallback, table_name, data.length ); for (const entry of data) { idx++; const newStatement = createNewValuesStatement(columns, entry); if (!newStatement) continue; if ( !isNaN(MAX_CHARS) && statement.length + newStatement.length > MAX_CHARS ) { await executeStatement(statement, idx); statement = ""; } if (statement.length === 0) { statement = `${insertStart}\n${newStatement}`; } else { statement += `,\n${newStatement}`; } } if (statement.length > insertStart.length) { await executeStatement(statement, idx); } }; }; |