egutierrez
8618aa1be3
- frontend/functions/core/format_datetime_short.md - frontend/functions/core/format_datetime_short.test.ts - frontend/functions/core/format_datetime_short.ts - frontend/functions/core/format_duration.md - frontend/functions/core/format_duration.test.ts - frontend/functions/core/format_duration.ts - frontend/functions/core/month_grid.md - frontend/functions/core/month_grid.test.ts - frontend/functions/core/month_grid.ts - frontend/functions/core/string_hash_palette.md - ... Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
49 lines
1.5 KiB
Markdown
49 lines
1.5 KiB
Markdown
---
|
|
name: sqlite_column_exists
|
|
kind: function
|
|
lang: go
|
|
domain: infra
|
|
version: "1.0.0"
|
|
purity: impure
|
|
signature: "func ColumnExists(conn *sql.DB, table, name string) (bool, error)"
|
|
description: "Comprueba si una columna existe en una tabla SQLite consultando PRAGMA table_info. Retorna false sin error si la tabla no existe."
|
|
tags: [database, sqlite, schema, pragma, column, migration]
|
|
uses_functions: []
|
|
uses_types: []
|
|
returns: []
|
|
returns_optional: false
|
|
error_type: "error_go_core"
|
|
imports: ["database/sql", "fmt"]
|
|
params:
|
|
- name: conn
|
|
desc: "conexion SQLite abierta"
|
|
- name: table
|
|
desc: "nombre de la tabla a inspeccionar"
|
|
- name: name
|
|
desc: "nombre de la columna a buscar"
|
|
output: "true si la columna existe, false si no existe o la tabla no existe; error si la query falla"
|
|
tested: true
|
|
tests:
|
|
- "columna existente retorna true"
|
|
- "columna inexistente retorna false"
|
|
- "tabla inexistente retorna false sin error"
|
|
test_file_path: "functions/infra/sqlite_column_exists_test.go"
|
|
file_path: "functions/infra/sqlite_column_exists.go"
|
|
---
|
|
|
|
## Ejemplo
|
|
|
|
```go
|
|
exists, err := ColumnExists(db, "cards", "assignee_id")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if !exists {
|
|
_, err = db.Exec(`ALTER TABLE cards ADD COLUMN assignee_id TEXT`)
|
|
}
|
|
```
|
|
|
|
## Notas
|
|
|
|
Extraido de apps/kanban/backend/db.go. Util como comprobacion previa a ALTER TABLE ADD COLUMN en scripts de migracion que necesitan ser idempotentes. PRAGMA table_info retorna cero filas si la tabla no existe, por lo que la funcion retorna false sin error en ese caso.
|