103 lines
2.8 KiB
JavaScript
103 lines
2.8 KiB
JavaScript
'use strict';
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const Collations = require('../const/collations.js');
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const FieldType = require('../const/field-type');
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const Capabilities = require('../const/capabilities');
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/**
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* Column definition
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* see https://mariadb.com/kb/en/library/resultset/#column-definition-packet
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*/
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class ColumnDef {
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constructor(packet, info) {
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this._parse = new StringParser(packet);
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if (info.serverCapabilities & Capabilities.MARIADB_CLIENT_EXTENDED_TYPE_INFO) {
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const subPacket = packet.subPacketLengthEncoded();
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while (subPacket.remaining()) {
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switch (subPacket.readUInt8()) {
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case 0:
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this.dataTypeName = subPacket.readAsciiStringLengthEncoded();
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break;
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case 1:
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this.dataTypeFormat = subPacket.readAsciiStringLengthEncoded();
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break;
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default:
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// skip data
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const len = subPacket.readUnsignedLength();
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if (len) {
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subPacket.skip(len);
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}
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break;
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}
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}
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}
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packet.skip(1); // length of fixed fields
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this.collation = Collations.fromIndex(packet.readUInt16());
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this.columnLength = packet.readUInt32();
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this.columnType = packet.readUInt8();
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this.flags = packet.readUInt16();
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this.scale = packet.readUInt8();
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this.type = FieldType.TYPES[this.columnType];
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}
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db() {
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return this._parse.packet.readString(this._parse.dbOffset, this._parse.dbLength);
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}
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schema() {
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return this._parse.packet.readString(this._parse.dbOffset, this._parse.dbLength);
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}
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table() {
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return this._parse.packet.readString(this._parse.tableOffset, this._parse.tableLength);
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}
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orgTable() {
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return this._parse.packet.readString(this._parse.orgTableOffset, this._parse.orgTableLength);
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}
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name() {
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return this._parse.packet.readString(this._parse.nameOffset, this._parse.nameLength);
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}
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orgName() {
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return this._parse.packet.readString(this._parse.orgNameOffset, this._parse.orgNameLength);
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}
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}
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/**
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* String parser.
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* This object permits to avoid listing all private information to metadata object.
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*/
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class StringParser {
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constructor(packet) {
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packet.skip(4); // skip 'def'
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this.dbLength = packet.readUnsignedLength();
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this.dbOffset = packet.pos;
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packet.skip(this.dbLength);
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this.tableLength = packet.readUnsignedLength();
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this.tableOffset = packet.pos;
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packet.skip(this.tableLength);
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this.orgTableLength = packet.readUnsignedLength();
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this.orgTableOffset = packet.pos;
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packet.skip(this.orgTableLength);
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this.nameLength = packet.readUnsignedLength();
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this.nameOffset = packet.pos;
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packet.skip(this.nameLength);
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this.orgNameLength = packet.readUnsignedLength();
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this.orgNameOffset = packet.pos;
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packet.skip(this.orgNameLength);
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this.packet = packet;
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}
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}
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module.exports = ColumnDef;
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