warkanum
9cc10715e3
- mssql: write computed columns (AS (expr) PERSISTED) and identity; read computed definition and identity - sqlite: write GENERATED ALWAYS AS (expr) STORED; read generated columns via table_xinfo and parse the expression - drizzle: generatedAlwaysAs / generated(Always|ByDefault)AsIdentity, read and write - typeorm: asExpression/generatedType and identity decorators, read and write; decorator scan is now quote-aware - bun, gorm readers: read generated and identity markers - readmes updated
MSSQL Reader
Reads database schema from Microsoft SQL Server databases using a live connection.
Features
- Live Connection: Connects to MSSQL databases using the Microsoft ODBC driver
- Multi-Schema Support: Reads multiple schemas with full support for user-defined schemas
- Comprehensive Metadata: Reads tables, columns, constraints, indexes, and extended properties
- Type Mapping: Converts MSSQL types to canonical types for cross-database compatibility
- Extended Properties: Extracts table and column descriptions from MS_Description
- Identity Columns: Maps IDENTITY columns to AutoIncrement
- Relationships: Derives relationships from foreign key constraints
Connection String Format
sqlserver://[user[:password]@][host][:port][?query]
Examples:
sqlserver://sa:password@localhost/dbname
sqlserver://user:pass@192.168.1.100:1433/production
sqlserver://localhost/testdb?encrypt=disable
Computed and Identity Columns
sys.computed_columns->Generated+GenerationExpression(outer parentheses removed; persisted or not)- Identity columns ->
Identity+IdentityGeneration = ALWAYS
Supported Constraints
- Primary Keys
- Foreign Keys (with ON DELETE and ON UPDATE actions)
- Unique Constraints
- Check Constraints
Type Mappings
| MSSQL Type | Canonical Type |
|---|---|
| INT | int |
| BIGINT | int64 |
| SMALLINT | int16 |
| TINYINT | int8 |
| BIT | bool |
| REAL | float32 |
| FLOAT | float64 |
| NUMERIC, DECIMAL | decimal |
| NVARCHAR, VARCHAR | string |
| DATETIME2 | timestamp |
| DATETIMEOFFSET | timestamptz |
| UNIQUEIDENTIFIER | uuid |
| VARBINARY | bytea |
| DATE | date |
| TIME | time |
Usage
import "git.warky.dev/wdevs/relspecgo/pkg/readers/mssql"
import "git.warky.dev/wdevs/relspecgo/pkg/readers"
reader := mssql.NewReader(&readers.ReaderOptions{
ConnectionString: "sqlserver://sa:password@localhost/mydb",
})
db, err := reader.ReadDatabase()
if err != nil {
panic(err)
}
// Process schema...
for _, schema := range db.Schemas {
fmt.Printf("Schema: %s\n", schema.Name)
for _, table := range schema.Tables {
fmt.Printf(" Table: %s\n", table.Name)
}
}
Testing
Run tests with:
go test ./pkg/readers/mssql/...
For integration testing with a live MSSQL database:
docker-compose up -d mssql
go test -tags=integration ./pkg/readers/mssql/...
docker-compose down