mirror of
https://github.com/ManyakRus/crud_generator.git
synced 2024-12-22 00:36:41 +02:00
76 lines
2.1 KiB
Go
76 lines
2.1 KiB
Go
|
// Package schema provides access to database schema metadata, for database/sql drivers.
|
||
|
|
//
|
||
|
|
// For further information about current driver support status, see https://github.com/jimsmart/schema
|
||
|
|
//
|
||
|
|
// Table Metadata
|
||
|
|
//
|
||
|
|
// The schema package works alongside database/sql and its underlying driver to provide schema metadata.
|
||
|
|
//
|
||
|
|
// // Fetch names of all tables
|
||
|
|
// tnames, err := schema.TableNames(db)
|
||
|
|
// ...
|
||
|
|
// // tnames is [][2]string
|
||
|
|
// for i := range tnames {
|
||
|
|
// fmt.Println("Table:", tnames[i][1])
|
||
|
|
// }
|
||
|
|
//
|
||
|
|
// // Output:
|
||
|
|
// // Table: employee_tbl
|
||
|
|
// // Table: department_tbl
|
||
|
|
// // Table: sales_tbl
|
||
|
|
//
|
||
|
|
// Both user permissions and current database/schema effect table visibility.
|
||
|
|
//
|
||
|
|
// Use schema.ColumnTypes() to query column type metadata for a single table:
|
||
|
|
//
|
||
|
|
// // Fetch column metadata for given table
|
||
|
|
// tcols, err := schema.ColumnTypes(db, "", "employee_tbl")
|
||
|
|
// ...
|
||
|
|
// // tcols is []*sql.ColumnType
|
||
|
|
// for i := range tcols {
|
||
|
|
// fmt.Println("Column:", tcols[i].Name(), tcols[i].DatabaseTypeName())
|
||
|
|
// }
|
||
|
|
//
|
||
|
|
// // Output:
|
||
|
|
// // Column: employee_id INTEGER
|
||
|
|
// // Column: first_name TEXT
|
||
|
|
// // Column: last_name TEXT
|
||
|
|
// // Column: created_at TIMESTAMP
|
||
|
|
//
|
||
|
|
// To query table names and column type metadata for all tables, use schema.Tables().
|
||
|
|
//
|
||
|
|
// See also https://golang.org/pkg/database/sql/#ColumnType
|
||
|
|
//
|
||
|
|
// Note: underlying support for column type metadata is driver implementation specific and somewhat variable.
|
||
|
|
//
|
||
|
|
// View Metadata
|
||
|
|
//
|
||
|
|
// The same metadata can also be queried for views also:
|
||
|
|
//
|
||
|
|
// // Fetch names of all views
|
||
|
|
// vnames, err := schema.ViewNames(db)
|
||
|
|
// ...
|
||
|
|
// // Fetch column metadata for given view
|
||
|
|
// vcols, err := schema.ColumnTypes(db, "", "monthly_sales_view")
|
||
|
|
// ...
|
||
|
|
// // Fetch column metadata for all views
|
||
|
|
// views, err := schema.Views(db)
|
||
|
|
// ...
|
||
|
|
//
|
||
|
|
// Primary Key Metadata
|
||
|
|
//
|
||
|
|
// To obtain a list of columns making up the primary key for a given table:
|
||
|
|
//
|
||
|
|
// // Fetch primary key for given table
|
||
|
|
// pks, err := schema.PrimaryKey(db, "", "employee_tbl")
|
||
|
|
// ...
|
||
|
|
// // pks is []string
|
||
|
|
// for i := range pks {
|
||
|
|
// fmt.Println("Primary Key:", pks[i])
|
||
|
|
// }
|
||
|
|
//
|
||
|
|
// // Output:
|
||
|
|
// // Primary Key: employee_id
|
||
|
|
//
|
||
|
|
package schema
|