tedious
Version:
A TDS driver, for connecting to MS SQLServer databases.
137 lines (135 loc) • 17.5 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.Transaction = exports.OPERATION_TYPE = exports.ISOLATION_LEVEL = void 0;
exports.assertValidIsolationLevel = assertValidIsolationLevel;
exports.isolationLevelByValue = void 0;
var _writableTrackingBuffer = _interopRequireDefault(require("./tracking-buffer/writable-tracking-buffer"));
var _allHeaders = require("./all-headers");
function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
/*
s2.2.6.8
*/
const OPERATION_TYPE = exports.OPERATION_TYPE = {
TM_GET_DTC_ADDRESS: 0x00,
TM_PROPAGATE_XACT: 0x01,
TM_BEGIN_XACT: 0x05,
TM_PROMOTE_XACT: 0x06,
TM_COMMIT_XACT: 0x07,
TM_ROLLBACK_XACT: 0x08,
TM_SAVE_XACT: 0x09
};
const ISOLATION_LEVEL = exports.ISOLATION_LEVEL = {
NO_CHANGE: 0x00,
READ_UNCOMMITTED: 0x01,
READ_COMMITTED: 0x02,
REPEATABLE_READ: 0x03,
SERIALIZABLE: 0x04,
SNAPSHOT: 0x05
};
const isolationLevelByValue = exports.isolationLevelByValue = {};
for (const name in ISOLATION_LEVEL) {
const value = ISOLATION_LEVEL[name];
isolationLevelByValue[value] = name;
}
function assertValidIsolationLevel(isolationLevel, name) {
if (typeof isolationLevel !== 'number') {
throw new TypeError(`The "${name}" ${name.includes('.') ? 'property' : 'argument'} must be of type number. Received type ${typeof isolationLevel} (${isolationLevel})`);
}
if (!Number.isInteger(isolationLevel)) {
throw new RangeError(`The value of "${name}" is out of range. It must be an integer. Received: ${isolationLevel}`);
}
if (!(isolationLevel >= 0 && isolationLevel <= 5)) {
throw new RangeError(`The value of "${name}" is out of range. It must be >= 0 && <= 5. Received: ${isolationLevel}`);
}
}
class Transaction {
constructor(name, isolationLevel = ISOLATION_LEVEL.NO_CHANGE) {
this.name = name;
this.isolationLevel = isolationLevel;
this.outstandingRequestCount = 1;
}
beginPayload(txnDescriptor) {
const buffer = new _writableTrackingBuffer.default();
(0, _allHeaders.writeToTrackingBuffer)(buffer, txnDescriptor, this.outstandingRequestCount);
buffer.writeUShort(OPERATION_TYPE.TM_BEGIN_XACT);
buffer.writeUInt8(this.isolationLevel);
buffer.writeUInt8(this.name.length * 2);
buffer.writeString(this.name, 'ucs2');
return {
*[Symbol.iterator]() {
yield buffer.data;
},
toString: () => {
return 'Begin Transaction: name=' + this.name + ', isolationLevel=' + isolationLevelByValue[this.isolationLevel];
}
};
}
commitPayload(txnDescriptor) {
const buffer = new _writableTrackingBuffer.default();
(0, _allHeaders.writeToTrackingBuffer)(buffer, txnDescriptor, this.outstandingRequestCount);
buffer.writeUShort(OPERATION_TYPE.TM_COMMIT_XACT);
buffer.writeUInt8(this.name.length * 2);
buffer.writeString(this.name, 'ucs2');
// No fBeginXact flag, so no new transaction is started.
buffer.writeUInt8(0);
return {
*[Symbol.iterator]() {
yield buffer.data;
},
toString: () => {
return 'Commit Transaction: name=' + this.name;
}
};
}
rollbackPayload(txnDescriptor) {
const buffer = new _writableTrackingBuffer.default();
(0, _allHeaders.writeToTrackingBuffer)(buffer, txnDescriptor, this.outstandingRequestCount);
buffer.writeUShort(OPERATION_TYPE.TM_ROLLBACK_XACT);
buffer.writeUInt8(this.name.length * 2);
buffer.writeString(this.name, 'ucs2');
// No fBeginXact flag, so no new transaction is started.
buffer.writeUInt8(0);
return {
*[Symbol.iterator]() {
yield buffer.data;
},
toString: () => {
return 'Rollback Transaction: name=' + this.name;
}
};
}
savePayload(txnDescriptor) {
const buffer = new _writableTrackingBuffer.default();
(0, _allHeaders.writeToTrackingBuffer)(buffer, txnDescriptor, this.outstandingRequestCount);
buffer.writeUShort(OPERATION_TYPE.TM_SAVE_XACT);
buffer.writeUInt8(this.name.length * 2);
buffer.writeString(this.name, 'ucs2');
return {
*[Symbol.iterator]() {
yield buffer.data;
},
toString: () => {
return 'Save Transaction: name=' + this.name;
}
};
}
isolationLevelToTSQL() {
switch (this.isolationLevel) {
case ISOLATION_LEVEL.READ_UNCOMMITTED:
return 'READ UNCOMMITTED';
case ISOLATION_LEVEL.READ_COMMITTED:
return 'READ COMMITTED';
case ISOLATION_LEVEL.REPEATABLE_READ:
return 'REPEATABLE READ';
case ISOLATION_LEVEL.SERIALIZABLE:
return 'SERIALIZABLE';
case ISOLATION_LEVEL.SNAPSHOT:
return 'SNAPSHOT';
}
return '';
}
}
exports.Transaction = Transaction;
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'property' : 'argument'} must be of type number. Received type ${typeof isolationLevel} (${isolationLevel})`);\n  }\n\n  if (!Number.isInteger(isolationLevel)) {\n    throw new RangeError(`The value of \"${name}\" is out of range. It must be an integer. Received: ${isolationLevel}`);\n  }\n\n  if (!(isolationLevel >= 0 && isolationLevel <= 5)) {\n    throw new RangeError(`The value of \"${name}\" is out of range. It must be >= 0 && <= 5. Received: ${isolationLevel}`);\n  }\n}\n\nexport class Transaction {\n  declare name: string;\n  declare isolationLevel: number;\n  declare outstandingRequestCount: number;\n\n  constructor(name: string, isolationLevel = ISOLATION_LEVEL.NO_CHANGE) {\n    this.name = name;\n    this.isolationLevel = isolationLevel;\n    this.outstandingRequestCount = 1;\n  }\n\n  beginPayload(txnDescriptor: Buffer) {\n    const buffer = new WritableTrackingBuffer();\n    writeToTrackingBuffer(buffer, txnDescriptor, this.outstandingRequestCount);\n    buffer.writeUShort(OPERATION_TYPE.TM_BEGIN_XACT);\n    buffer.writeUInt8(this.isolationLevel);\n    buffer.writeUInt8(this.name.length * 2);\n    buffer.writeString(this.name, 'ucs2');\n\n    return {\n      *[Symbol.iterator]() {\n        yield buffer.data;\n      },\n      toString: () => {\n        return 'Begin Transaction: name=' + this.name + ', isolationLevel=' + isolationLevelByValue[this.isolationLevel];\n      }\n    };\n  }\n\n  commitPayload(txnDescriptor: Buffer) {\n    const buffer = new WritableTrackingBuffer();\n    writeToTrackingBuffer(buffer, txnDescriptor, this.outstandingRequestCount);\n    buffer.writeUShort(OPERATION_TYPE.TM_COMMIT_XACT);\n    buffer.writeUInt8(this.name.length * 2);\n    buffer.writeString(this.name, 'ucs2');\n    // No fBeginXact flag, so no new transaction is started.\n    buffer.writeUInt8(0);\n\n    return {\n      *[Symbol.iterator]() {\n        yield buffer.data;\n      },\n      toString: () => {\n        return 'Commit Transaction: name=' + this.name;\n      }\n    };\n  }\n\n  rollbackPayload(txnDescriptor: Buffer) {\n    const buffer = new WritableTrackingBuffer();\n    writeToTrackingBuffer(buffer, txnDescriptor, this.outstandingRequestCount);\n    buffer.writeUShort(OPERATION_TYPE.TM_ROLLBACK_XACT);\n    buffer.writeUInt8(this.name.length * 2);\n    buffer.writeString(this.name, 'ucs2');\n    // No fBeginXact flag, so no new transaction is started.\n    buffer.writeUInt8(0);\n\n    return {\n      *[Symbol.iterator]() {\n        yield buffer.data;\n      },\n      toString: () => {\n        return 'Rollback Transaction: name=' + this.name;\n      }\n    };\n  }\n\n  savePayload(txnDescriptor: Buffer) {\n    const buffer = new WritableTrackingBuffer();\n    writeToTrackingBuffer(buffer, txnDescriptor, this.outstandingRequestCount);\n    buffer.writeUShort(OPERATION_TYPE.TM_SAVE_XACT);\n    buffer.writeUInt8(this.name.length * 2);\n    buffer.writeString(this.name, 'ucs2');\n\n    return {\n      *[Symbol.iterator]() {\n        yield buffer.data;\n      },\n      toString: () => {\n        return 'Save Transaction: name=' + this.name;\n      }\n    };\n  }\n\n  isolationLevelToTSQL() {\n    switch (this.isolationLevel) {\n      case ISOLATION_LEVEL.READ_UNCOMMITTED:\n        return 'READ UNCOMMITTED';\n      case ISOLATION_LEVEL.READ_COMMITTED:\n        return 'READ COMMITTED';\n      case ISOLATION_LEVEL.REPEATABLE_READ:\n        return 'REPEATABLE READ';\n      case ISOLATION_LEVEL.SERIALIZABLE:\n        return 'SERIALIZABLE';\n      case ISOLATION_LEVEL.SNAPSHOT:\n        return 'SNAPSHOT';\n    }\n    return '';\n  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