UNPKG

tedious

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A TDS driver, for connecting to MS SQLServer databases.

146 lines (142 loc) • 17.2 kB
"use strict"; Object.defineProperty(exports, "__esModule", { value: true }); exports.default = void 0; var _iconvLite = _interopRequireDefault(require("iconv-lite")); var _plpStream = require("./plp-stream"); function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; } const MAX = (1 << 16) - 1; const NULL_LENGTH = Buffer.from([0xFF, 0xFF]); const MAX_NULL_LENGTH = Buffer.from([0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF]); const NO_COLLATION = Buffer.from([0x00, 0x00, 0x00, 0x00, 0x00]); // Each chunk is encoded on its own, as `Writable.prototype.write` would // encode it: a source must not split a UTF-16 surrogate pair across two // chunks (see `Request.addParameter`). function encoderFor(codepage) { return chunk => { if (typeof chunk !== 'string') { throw new TypeError('Invalid string.'); } return _iconvLite.default.encode(chunk, codepage); }; } const VarChar = { id: 0xA7, type: 'BIGVARCHR', name: 'VarChar', maximumLength: 8000, declaration: function (parameter) { const value = parameter.value; if ((0, _plpStream.isAsyncIterable)(value)) { return 'varchar(max)'; } let length; if (parameter.length) { length = parameter.length; } else if (value != null) { length = value.length || 1; } else if (value === null && !parameter.output) { length = 1; } else { length = this.maximumLength; } if (length <= this.maximumLength) { return 'varchar(' + length + ')'; } else { return 'varchar(max)'; } }, resolveLength: function (parameter) { const value = parameter.value; if (parameter.length != null) { return parameter.length; } else if (value != null) { return value.length || 1; } else { return this.maximumLength; } }, validate: function (value, collation) { if (value == null) { return null; } if (typeof value !== 'string') { throw new TypeError('Invalid string.'); } if (!collation) { throw new Error('No collation was set by the server for the current connection.'); } if (!collation.codepage) { throw new Error('The collation set by the server has no associated encoding.'); } return _iconvLite.default.encode(value, collation.codepage); }, resolve(parameter, collation) { if ((0, _plpStream.isAsyncIterable)(parameter.value)) { // Read from its source while the request is written, and sent as // `varchar(max)` since its length is not known up front. The chunks // are encoded as they arrive, so the collation is checked here, as // `validate` does for an in-memory value, rather than once the // request is already being written. if (!collation) { throw new Error('No collation was set by the server for the current connection.'); } if (!collation.codepage) { throw new Error('The collation set by the server has no associated encoding.'); } return { value: parameter.value, length: MAX, collation }; } const value = this.validate(parameter.value, collation); const data = { value }; data.length = parameter.length != null ? parameter.length : this.resolveLength({ ...parameter, value }); if (collation) { data.collation = collation; } return data; }, writeTypeInfo(buffer, parameter) { buffer.writeUInt8(this.id); if (parameter.length <= this.maximumLength) { buffer.writeUInt16LE(parameter.length); } else { buffer.writeUInt16LE(MAX); } if (parameter.collation) { buffer.writeBuffer(parameter.collation.toBuffer().subarray(0, 5)); } else { buffer.writeBuffer(NO_COLLATION); } }, writeValue(buffer, parameter) { if (parameter.value == null) { buffer.writeBuffer(parameter.length <= this.maximumLength ? 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