1. dialects
prorm
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    • Logging
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  • prorm control plane
    • Introduction
    • Authentication
    • Errors
    • Getting started
      • Service
        • Is it up
        • This description
    • Account
      • Sign-up and verification
        • Create an account
        • Exchange credentials for a token
        • Verify with the emailed code
        • Verify by clicking the emailed link
        • Name the parent or guardian
        • What a consent link is about
        • Give consent for a child's account
        • Ask the parent or guardian again
        • Send a new code and link
      • Family
        • Everyone this account is responsible for
        • One child, in detail
        • Turn a limit on or off
      • Profile
        • Who am I
        • Change the account
        • Every address on the account
        • Add an address
        • Confirm an address with the code mailed to it
        • Mail a fresh code to an unconfirmed address
        • Make an address primary
        • Remove an address
        • What this caller may do
    • Security
      • Sessions
        • Everywhere this account is signed in
        • Sign out everywhere else
        • Sign one out
        • A token for the CLI on a named machine
        • A token for the customer console, from the staff one
        • Park a sign-in for the CLI to collect
        • The CLI collecting its sign-in
        • The team's members' live sessions
        • Sign a member's session out
        • Sign an account out everywhere
        • Everywhere the account is signed in
        • Sign an account's session out
      • Single sign-on
        • Begin a single sign-on
        • The provider's return
        • Link the signed-in account to a team's provider
        • Which team an address signs in to
        • The team's single sign-on, as a member sees it
        • Set the team's OpenID Connect provider up, or change it
        • Remove the provider
        • The team's domain claims and the DNS record each needs
        • Prove a claimed domain
      • MFA and passwords
        • Start enrolling a second factor
        • Prove the app has it
        • Remove the second factor
        • Ask for a reset link
        • Set a new password with the emailed token
      • Klock
        • Open a device-bound klock session
        • Check in, for the next grant
        • Step up the session asking
        • Rotate the device key
        • Freeze a session
        • Unfreeze a session
        • A guest grant
        • The revocation feed
        • The published keyset
        • What this control plane supports
      • Devices
        • Your devices, or a team's
        • Approve a new device's pairing code
        • One device
        • Rename a device
        • Revoke a device
        • Suspend a device
        • Reinstate a suspended device
        • Wipe a device
        • Ask a device to rotate its key
        • The team's members' devices
        • Revoke a member's device
        • An account's devices
        • Revoke an account's device
        • Wipe an account's device
        • The device fleet
      • Access rules and behaviour
        • The access rules that bear on you
        • Add an access rule
        • This request, as the rules see it
        • One access rule
        • Remove an access rule
        • The behaviour profiles that bear on you
        • Add or change a behaviour profile
        • The profile presets
        • Your behaviour findings
        • Acknowledge a finding
        • One behaviour profile
        • Remove a behaviour profile
        • The team's access rules
        • Add a team access rule
        • Remove a team access rule
        • The team's behaviour profiles
        • Add or change a team behaviour profile
        • Remove a team behaviour profile
        • What the team's profiles caught
        • Acknowledge a team finding
      • Recovery and lockdown
        • Ask for a recovery link
        • Recover access with the emailed code
        • Is the account locked down
        • Lock the account down
        • Release a lockdown
        • Lock a member down
        • Release a member's lockdown
      • MCP tokens
        • Make a delegated token for one MCP client
        • The account's delegated tokens
        • Revoke a delegated token
        • What a delegated token may do now
        • Run one MCP tool with a delegated token
        • Run a device-signed MCP tool call relayed by the MCP Worker
      • Kerberos
        • Give the team its own Kerberos realm
        • The team's realm
        • Remove the team's realm
    • Logging and monitoring
      • Audit log
        • What has been done to the account
        • What has happened to this account
        • The account's audit trail
      • Operations
        • Everything that has been asked of this database
        • One, with its steps
        • Stop it
        • Put a failed one back in the queue
        • Every operation, across all accounts
      • Metrics and events
        • Every measurement, for a graph
        • Who did what to it
    • Billing
      • Plans and pricing
        • What the plans allow
        • The rate card
        • What one database would cost
        • What this account is paying for, itemised
      • Subscriptions and invoices
        • What this month's invoice will say
        • What this account is on
        • What it has been charged
        • Start a Stripe Checkout session
        • Open the customer portal
        • Stripe's events
        • Buy more connection pools
      • Team billing
        • The team's billing account
        • What the team has been charged
        • What this month's invoice will say
        • The team's cards
        • Add a card, through a Stripe-hosted setup session
        • Make a card the team's default
        • Remove a card
        • Start the team paying
        • Open the Stripe portal on the team's customer
        • Change the team's plan
        • Who receives the team's bills
        • How the team pays for transfers
    • Support
      • Support chat
        • My conversations
        • Start a conversation
        • Every support conversation, open first
        • A ticket for the socket
        • One conversation, with who is in it and who is connected
        • Rename a group; open or close a support conversation
        • The lines, oldest first
        • Say something
        • Add somebody
        • Mark read
    • Administration
      • Users
        • Every account
        • One account, with everything hanging off it
        • Grant or revoke admin
        • Verify an account by hand
        • Lock or unlock sign-in
        • Allow or hold provisioning
        • Send the verification mail again
        • Set the plan by hand
      • Platform
        • Every database and store, across all accounts
        • The counts worth putting on a dashboard
      • Staff and permissions
        • What kind of admin the caller is, and which scopes they hold
        • The admin presets
        • Every admin, and the scopes each resolves to
        • Make an account an admin of a kind
        • Change an admin's kind, or a custom admin's scopes
        • Revoke admin
      • Team administration
        • Every team, with its owner and size
        • One team in full — members with their accounts, and projects
        • Hand the team to another member
        • Put an account in the team, active at once
        • Change a member's role
        • Remove a member
      • Assumed identities
        • Assume an identity — act as a customer account
        • The identities the caller holds open
        • End an assumed identity
      • Support inbox
        • The platform's addresses
        • Add a platform address
        • One address, with its counts
        • Change an address's label, routing, or whether it accepts mail
        • Remove an address that holds no mail
        • Make, adopt or repair the address's routing rule
        • Every admin's personal address, made where missing
        • File a raw message, as if it had arrived
        • The inbox
        • One message, whole
        • Mark a message
        • Hand a message to an admin, or take it back
        • Leave an internal note
        • Reply, from the address the message came to
        • What is waiting
    • Databases
      • Databases
        • Data stores
          • Every data store on the account
          • Provision a data store
          • Change a data store that is already running
          • One data store
          • Deprovision it
          • Report what it is using
          • How to reach a data store
        • Connections and credentials
          • The api keys on a database
          • Issue a key
          • Revoke a key
          • The engine users we created
          • Create a user inside the database
          • Give a user a new password
          • Drop a user
          • How the database is reached
          • Set how it is reached
          • Revoke every api key on it
          • How to connect to it
          • The ssh keys that open its bastion
          • Add a key, or have one made
          • The private half of a generated key, once
          • Revoke an ssh key
        • Schema and objects
          • The SQL objects we put in it
          • Create one, and apply it
          • What is in the database, as the engine reports it
          • One table
          • What it would run, without running it
          • Redefine an object in place
          • Drop it
          • The extensions installed in it
        • Migrations
          • A plan compiled to statements, recording nothing
          • The migrations recorded for it
          • Record one
          • Apply everything recorded and not yet run
          • Apply everything pending, oldest version first
        • Lifecycle
          • Grow or shrink it
          • Stop it accepting connections
          • Start it again
          • Move it to another region
        • Backups and replicas
          • Take a backup
          • The backups it has
          • Restore one into it
          • What has been restored into it, and from where
          • Its read copies
          • Add one
        • Policies
          • The catalog
          • One policy
          • What this database is held to
          • Switch a policy on, or change its knobs
          • Switch it off
          • Mark the policies reviewed
          • Evaluate the periodic policies now
          • Who is behind a credential
        • Passwordless
          • The database's passwordless sessions
          • Issue a passwordless session (v1)
          • Revoke a passwordless session
          • Bind a session to a device key
          • Issue a v2 session for a host to bind
          • Redeem an enrolment ticket on the host
          • Check a passwordless credential
          • Run one described query under a passwordless credential
        • Database roles
          • The database's roles
          • Define a role
          • One role
          • Change what a role permits
          • Delete a role, and revoke every key granted it
          • Grant a role, which mints a key
          • Who holds a role
          • The api keys bound to a role
        • Pools
          • A database's connection pools, and how busy each is
          • Open another pool
          • Rename a pool or change its size
          • Close a pool
        • Data plane
          • Run a query against a database
          • Several statements, in order, over one connection
          • Is this database answering
          • What the proxy itself is holding
        • Transfers
          • The strategies this account's tier may use
          • Price a transfer without creating it
          • The account's transfer jobs, newest first
          • Create a transfer job
          • One job, and whether its certificate holds
          • Cancel an unfinished job
          • Start a created job, confirming its price
          • Report a job's status (the runner, or the owner's side of a local run)
        • Every database on the account
        • Provision a database
        • Change a database that is already running
        • One database
        • Deprovision it
        • Read or write it
        • Report what it is using
        • The engines this API will provision
        • Where a managed database can be put
    • Teams
      • Teams
        • Members
          • Who is on it
          • Invite somebody
          • Accept an invitation
          • Change somebody's role
          • Remove somebody
        • Projects
          • The projects a team runs
          • Start one
          • Rename a project, or move its environment
          • Delete a project
          • One project, and what is in it
          • Put a database or store in it
          • What is in a project
          • Take one out
        • The teams this account is on
        • Start one
        • The twelve roles, and what each may do
        • Rename a team
        • Close a team
        • One team
        • Hand the team to somebody else
        • Leave a team
    • Schemas
      • Error
      • ValidationErrors
      • Token
      • PolicyCategory
      • PolicySeverity
      • PolicyAction
      • PolicyTrigger
      • PolicyParam
      • Policy
      • PolicyCatalog
      • PolicyAssignment
      • PolicyOutcome
      • PolicyFiring
      • CredentialTrace
      • Relation
      • Restrictions
      • ChildSummary
      • SignupRequest
      • SigninRequest
      • UpdateMeRequest
      • User
      • Address
      • GeoPoint
      • D1Region
      • Usage
      • UsageReport
      • Resource
      • Database
      • DataStore
      • NewDatabase
      • NewDataStore
      • QueryRequest
      • DatabasePrivilege
      • ApiKey
      • DbUser
      • Access
      • AccessRequest
      • DatabaseObject
      • NewDatabaseObject
      • NewMigration
      • SchemaOperation
      • Migration
      • Operation
      • Session
      • AdminPowers
      • Admin
      • AuditEntry
      • TeamRole
      • Conversation
      • ChatMessage
      • TeamSso
      • Team
      • TeamMember
      • SshKey
      • ConnectionInfo
      • InboxAddress
      • InboxMailbox
      • InboxMessageSummary
      • InboxMessage
      • InboxNote
      • Page
      • Quote
      • Plan
      • ApiError
      • CapabilityRefusal
      • KlockErrorCode
      • PageWindow
      • SessionView
      • KlockStepUpRequest
      • KlockOpenRequest
      • KlockOpenedSession
      • UpdateMeResult
      • CapabilitiesView
      • SessionLimits
      • Device
      • DeviceListed
      • DeviceTeamRef
      • DeviceCommand
      • DeviceAuditLine
      • DeviceActionRequest
      • StaffActionRequest
      • ManagedSession
      • SessionRevoked
      • AccessRule
      • AccessRuleRequest
      • BehaviourProfile
      • BehaviourProfileRequest
      • BehaviourProfileSaved
      • BehaviourFinding
      • BehaviourFindingAck
      • StepUpProof
      • Removed
      • MemberLockdownRequest
      • McpClient
      • McpDelegatedView
      • McpToolCall
      • McpForwardRequest
      • PasswordlessScope
      • RoleScope
      • PasswordlessSession
      • PasswordlessTlsMaterial
      • PasswordlessKerberosMaterial
      • ServiceDeviceKeys
      • ServiceSession
      • DatabaseRole
      • TransferEndpoint
      • TransferJobRequest
      • TransferQuote
      • TransferStrategy
      • TransferJob
      • TransferJobAccess
      • Pool
      • PoolAllowance
      • BillingSubscription
      • Invoice
      • BillingContact
      • PaymentMethod
      • UpcomingCharges
      • TeamBilling
      • TeamKerberosRealm
      • TeamSsoDomain
      • TeamSsoResponse
      • StoreConnection
      • BatchFailure
      • ProxyStatus
  1. dialects

Microsoft Fabric Data Warehouse Dialect

Overview#

Fabric Data Warehouse
(and the SQL analytics endpoint of a Lakehouse) speaks T-SQL over TDS on port
1433 through the same mssql driver SQL Server uses, so FabricDialect
extends MSSQLDialect: parameter binding (@p1), [bracket] quoting,
WHERE/ORDER building, TOP, OFFSET/FETCH, MERGE upserts, multi-row
VALUES and catalog introspection are all inherited.
It extends the SQL Server dialect, not the Synapse one. Fabric is not a
dedicated SQL pool: tables are Delta Parquet in OneLake, so there is no
DISTRIBUTION, no storage-index choice and no PARTITION, while OFFSET/FETCH,
MERGE, sp_rename and CREATE OR ALTER — which the pool lacks — all exist.
PropertyValue
Dialect namefabric
ExtendsMSSQLDialect
Drivermssql (tedious)
Default port1433
Cloud SDK@azure/identity (Entra only)
Local runtimenone — hosted service only

Quick start#

Install#

$ npm install ts-prorm-orm mssql
$ pnpm add ts-prorm-orm mssql
$ yarn add ts-prorm-orm mssql
$ bun add ts-prorm-orm mssql
mssql is the same driver the mssql dialect uses.

Connect#

import { Prorm } from 'ts-prorm-orm';

export const db = new Prorm({
  dialect: 'fabric',
  host: 'abc123.datawarehouse.fabric.microsoft.com',
  database: 'Sales', // the warehouse
  dialectOptions: {
    entra: true, // DefaultAzureCredential
  },
});

Define a model#

import { DataTypes } from 'ts-prorm-orm';

const User = db.define('User', {
  id: { type: DataTypes.INTEGER(), primaryKey: true, autoIncrement: true },
  email: { type: DataTypes.STRING(255), allowNull: false, unique: true },
  name: { type: DataTypes.STRING(100) },
}, { timestamps: false });

await db.sync(); // CREATE TABLE — see Generated SQL below
[!NOTE] Why timestamps: false
A DEFAULT on column "createdAt" is not supported by Microsoft Fabric Data Warehouse. Fabric has no default constraints. Supply the value on INSERT, or use COPY INTO’s per-column default when loading.

Query#

import { Op } from 'ts-prorm-orm';

await User.create({ email: 'ada@example.com', name: 'Ada' });

const page = await User.findAll({
  where: { name: { [Op.like]: 'A%' } },
  order: [['id', 'ASC']],
  limit: 20,
  offset: 40,
});

Managed and cloud variants#

One tab per way of logging in. The token-based ones fetch a short-lived token for every new pooled connection, so a pool that outlives a token keeps working; Cloud authentication covers the providers, caching and TLS rules behind them.
import { Prorm } from 'ts-prorm-orm';

export const db = new Prorm({
  dialect: 'fabric',
  host: 'abc123.datawarehouse.fabric.microsoft.com',
  database: 'Sales',
  dialectOptions: {
    entra: true, // DefaultAzureCredential: env, workload/managed identity, Azure CLI
  },
});
Needs @azure/identity installed next to the driver.
import { Prorm } from 'ts-prorm-orm';

export const db = new Prorm({
  dialect: 'fabric',
  host: 'abc123.datawarehouse.fabric.microsoft.com',
  database: 'Sales',
  dialectOptions: {
    entra: { credential: { type: 'managed-identity', clientId: process.env.AZURE_CLIENT_ID } },
  },
});
Needs @azure/identity installed next to the driver.
import { Prorm } from 'ts-prorm-orm';

export const db = new Prorm({
  dialect: 'fabric',
  host: 'abc123.datawarehouse.fabric.microsoft.com',
  database: 'Sales',
  dialectOptions: {
    entra: {
      credential: {
        type: 'client-secret',
        tenantId: process.env.AZURE_TENANT_ID!,
        clientId: process.env.AZURE_CLIENT_ID!,
        clientSecret: process.env.AZURE_CLIENT_SECRET!,
      },
    },
  },
});
Needs @azure/identity installed next to the driver.

Generated SQL#

Each block is the statement the model call above it hands the dialect's query(), captured with the driver stubbed out. The model layer inlines the values.

Create table#

db.sync() for the model in the Quick start:
CREATE TABLE

Insert, update and delete#

await User.create({ email: 'ada@example.com', name: 'Ada' });
await User.update({ name: 'Grace' }, { where: { email: 'ada@example.com' } });
await User.destroy({ where: { id: 1 } });

Upsert#

await User.upsert({ id: 1, email: 'ada@example.com', name: 'Ada Lovelace' });
MERGE statement
upsert() also reads the row by primary key before and after the write, to return the instance.

Pagination#

await User.findAll({
  where: { name: { [Op.like]: 'A%' } },
  order: [['id', 'ASC']],
  limit: 20,
  offset: 40,
});

Transaction#

await db.transaction(async (t) => {
  await User.create({ email: 'grace@example.com', name: 'Grace' }, { transaction: t });
  await User.update({ name: 'Grace Hopper' }, { where: { email: 'grace@example.com' }, transaction: t });
});
[!WARNING] No savepoints
Nested transactions need savepoints, and fabric has none. Run the work in a single transaction, or restructure it so nothing nests.
Type mapping for the portable descriptors: STRING → VARCHAR(255), auto-increment INTEGER → INT, BOOLEAN → BIT, DATE → DATETIME2(6), UUID → UNIQUEIDENTIFIER, JSON → VARCHAR(MAX). The type comparison lines the major engines up side by side.

Connection — Microsoft Entra ID only#

Fabric accepts no SQL logins. The dialect sends tedious's authentication
block, defaulting to DefaultAzureCredential (environment, workload identity,
managed identity, Azure CLI):
import { Prorm } from 'ts-prorm-orm';

const db = new Prorm({
  dialect: 'fabric',
  host: 'abc123.datawarehouse.fabric.microsoft.com', // the warehouse's SQL connection string
  database: 'Sales', // the warehouse
  dialectOptions: {
    authentication: {
      type: 'azure-active-directory-service-principal-secret',
      options: { clientId, clientSecret, tenantId },
    },
  },
});
Supported authentication.types: azure-active-directory-default (default),
-service-principal-secret, -access-token, -password, -msi-vm,
-msi-app-service. TLS is on and the certificate is verified by default.
To use the shared cloud-auth token providers instead, pass
entra (true, or { credential } — the scope is
https://database.windows.net/.default) or any tokenProvider; the token is
wired through tediousAuth(), so each new pooled connection gets a current
one. Give one of entra, tokenProvider or authentication.
The inherited connect() (and its retry loop) builds the pool. Fabric
overrides the base's resolvePoolConfig hook to remove user/password, add
the authentication block (and beforeConnect for token providers), and pin
encrypt: true, trustServerCertificate: false. Construction throws if the
certificate would not be verified.

What differs from MSSQL#

FabricDialect extends MSSQLDialect (mssql) and
overrides 76 of its methods (Object.getOwnPropertyNames(FabricDialect.prototype),
computed by the scratch test); everything else is inherited unchanged.
AreaOverridden
Connection and executionresolvePoolConfig, startTransaction
DML buildersbuildDeleteQuery, buildInsertQuery, buildSelectQuery, buildUpdateQuery, buildUpsertQuery, bulkInsert
TypesbuildFabricColumnSql, getDataTypeSql
DDL and schemaaddColumn, addForeignKey, addIndex, buildClusterBy, buildConstraintStatement, buildCreateTableStatements, buildCtasSql, changeColumn, createColumnstoreIndex, createComputedColumn, createConstraint, createDatabaseSQL, createExpressionIndex, createFulltextIndex, createIdentityColumn, createIndex, createMaterializedView, createPartialIndex, createPartitionedTable, createSavepointSQL, createSchema, createSequence, createSpatialIndex, createStatisticsSQL, createTable, createTableAs, createTrigger, disableSystemVersioning, dropDatabaseSQL, dropSequence, dropTemporalTable, dropTrigger, refreshMaterializedView, renameTable
IntrospectionassertColumnName, assertNoReturning, assertObjectName, hasSequence, hasTrigger, listSequences, tableRef
OtherbuildCloneTableSql, buildCopyIntoSql, buildCredential, buildReseedIdentitySql, cloneTable, commentColumn, commentTable, copyInto, fabricCollate, fractionalPrecision, insert, nextSequenceValue, noIndexes, noSpatial, releaseSavepointSQL, rollbackToSavepointSQL, stAsText, stContains, stDWithin, stDistance, stGeomFromText, stIntersects, stWithin, updateStatisticsSQL, wroteMax

Types#

Model typeFabric column
STRING(n) / TEXT / ENUM / JSONVARCHAR(n) / VARCHAR(MAX) / VARCHAR(255) / VARCHAR(MAX) — never NVARCHAR (the warehouse collation is UTF-8)
CHAR(n)CHAR(n)
INTEGER / BIGINT / one-byte INTEGERINT / BIGINT / SMALLINT (no TINYINT)
FLOAT / DOUBLE / DECIMAL(p,s)REAL / FLOAT / DECIMAL(p,s)
BOOLEANBIT
DATE / DATEONLY / TIMEDATETIME2(6) / DATE / TIME(6) — precision 0–6 is required, 7 does not exist
BLOB / UUIDVARBINARY(MAX) / UNIQUEIDENTIFIER
Refused, each with Microsoft's documented alternative: NVARCHAR, NCHAR,
NTEXT, TEXT, IMAGE, TINYINT, DATETIME, SMALLDATETIME,
DATETIMEOFFSET, MONEY, SMALLMONEY, XML, GEOMETRY, GEOGRAPHY, JSON,
VECTOR, SQL_VARIANT, HIERARCHYID, ROWVERSION, BINARY, and a
DATETIME2/TIME precision above 6.

Tables and keys#

Fabric does not accept constraints inside CREATE TABLE. PRIMARY KEY and
UNIQUE exist only as NONCLUSTERED … NOT ENFORCED, FOREIGN KEY only as
NOT ENFORCED, all added afterwards with ALTER TABLE. createTable() builds
exactly that and sends it as one batch inside one transaction:
await db.dialect.createTable(
  'Orders',
  {
    id: { type: DataTypes.INTEGER, primaryKey: true, autoIncrement: true },
    customerId: { type: DataTypes.BIGINT, references: { table: 'Customers', field: 'id' } },
  },
  { schema: 'dbo', clusterBy: ['customerId'] },
);
buildCreateTableStatements() returns the statements without sending them.
Keys are not enforced. They inform the optimizer; uniqueness and
referential integrity are the load pipeline's job.
IDENTITY is BIGINT only, with no seed or increment. An INTEGER
autoIncrement key is widened to BIGINT (every value still fits); any other
type is refused. Values are unique but not sequential.
clusterBy emits WITH (CLUSTER BY (...)) — one to four columns.
addColumn accepts only nullable columns; changeColumn emits
ALTER COLUMN (a preview feature in Fabric).

Fabric features, as structured builders#

Time travel#

db.dialect.buildSelectQuery({
  tableName: 'Sales',
  forTimestampAsOf: new Date('2024-03-13T19:39:35.28Z'),
});
// SELECT * FROM [Sales] OPTION (FOR TIMESTAMP AS OF '2024-03-13T19:39:35.280')
A Date is rendered in UTC with three fractional digits; a string must be
YYYY-MM-DDTHH:MM:SS[.fff], anything else is refused.

CREATE TABLE AS SELECT#

db.dialect.buildCtasSql(
  'Recent',
  { tableName: 'Sales', where: { region: 'EU' } },
  { clusterBy: ['region'] },
);
// CREATE TABLE [Recent] WITH (CLUSTER BY ([region])) AS SELECT * FROM [Sales] WHERE [region] = 'EU'
Fabric forbids variables in CTAS, so the SELECT's values are inlined as escaped
literals. order and forTimestampAsOf are refused (a table has no order; to
copy a past state, clone it).

Zero-copy clone#

db.dialect.buildCloneTableSql('Employee', 'EmployeeUSA', { at: '2023-05-23T14:24:10' });
// CREATE TABLE [Employee] AS CLONE OF [EmployeeUSA] AT '2023-05-23T14:24:10'

COPY INTO#

db.dialect.buildCopyIntoSql('Sales', {
  schema: 'dbo',
  from: 'https://acct.blob.core.windows.net/c/sales/*.parquet',
  fileType: 'PARQUET',
  credential: { identity: 'Shared Access Signature', secret: sas },
});
Supports the column list (default, CSV fieldNumber, JSONL jsonPath),
FILE_TYPE (CSV/PARQUET/JSONL), CREDENTIAL (SAS, storage account key,
workspace identity), ERRORFILE[_CREDENTIAL], MAXERRORS, COMPRESSION,
FIELDQUOTE, FIELDTERMINATOR, ROWTERMINATOR, FIRSTROW, DATEFORMAT,
ENCODING, PARSER_VERSION, MATCH_COLUMN_COUNT and IDENTITY_INSERT.
Locations must be https://; every enumerated option is checked.

Identity reseed and statistics#

db.dialect.buildReseedIdentitySql('DimProduct', 'dbo'); // DBCC CHECKIDENT('dbo.DimProduct', RESEED)
db.dialect.createStatisticsSQL('Sales', 'st_region', ['region']);
db.dialect.updateStatisticsSQL('Sales');

What it refuses#

Asked forWhy
DEFAULT, CHECK, ON DELETE/ON UPDATENo default or check constraints; keys are unenforced
Any index (addIndex, partial, expression, columnstore, full-text, spatial)Tables are Delta Parquet; use clusterBy
Sequences, triggers, computed columnsNot in Fabric
Materialized/indexed views, partitioned tablesNot in Fabric
Temporal tables, FOR SYSTEM_TIMEUse forTimestampAsOf / clone at
returning on any DML (the OUTPUT clause)Not in Fabric
Recursive CTEs, lock hintsNot in Fabric (table-level locking, snapshot isolation)
An isolation level other than SNAPSHOTFabric ignores it; refused rather than silently not honoured
SavepointsNot supported
CREATE DATABASE / DROP DATABASEA warehouse is a Fabric item (portal / REST API)
Table/column commentsNo sp_addextendedproperty
Multi-column CREATE STATISTICSNot supported manually
Table/schema names with /, \, a trailing ., or over 128 charactersNot storable
Adding a NOT NULL or IDENTITY column to an existing tableRecreate with CTAS

References#

T-SQL surface area
Data types
Primary, foreign and unique keys
IDENTITY columns
Time travel
Transactions
COPY INTO
CREATE TABLE AS CLONE OF

Capabilities#

Computed from the code — capabilitiesOf() (src/transaction-support.ts),
whereSupportOf() (src/query-builders/expression-render.ts),
sqlObjectCapabilitiesOf() (src/sql-objects/capabilities.ts) and the
builders — by the scratch test described in the
capability matrix.
Capabilityfabric
Transactions atomicyes
Savepointsno — a nested transaction() throws
Isolationup to SERIALIZABLE; native levels SNAPSHOT
Transaction modesread-only no; deferrable no; constraint deferral no
RETURNINGrefused — The OUTPUT clause (returning on INSERT) is not supported by Microsoft Fabric Data Warehouse. Re-select the rows after the statement. IDENTITY values are uniqu
UpsertMERGE INTO … WHEN MATCHED / WHEN NOT MATCHED
JSON columnVARCHAR(MAX) (JSONB → VARCHAR(MAX))
Vector columnrefused — The VECTOR data type is not supported by Microsoft Fabric Data Warehouse. There is no equivalent.
Array columnrefused — The ARRAY data type is not supported by Microsoft Fabric Data Warehouse. Neither Fabric nor SQL Server has it; store it as VARCHAR (JSON or text) or VARBINARY,
WHERE builder18 operator keys; $and/$or/$not; $exists: yes; $in subquery: no; expression operands: no
SQL objectsfamily mssql: triggers no; procedures yes; functions multiStatement; materialized views emulated (indexedView); sequences yes; enums check; RLS no
StreamingqueryStream() present; LISTEN absent; createExtension() present

Testing#

tests/dialects/fabric.test.ts exercises the dialect with a mocked driver, so nothing touches a server.

See also#

All dialects — the family tree and the capability matrix
mssql — the parent dialect this one extends
Modified at 2026-10-04 00:40:16
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