142 lines
3.0 KiB
Go
142 lines
3.0 KiB
Go
// Copyright (C) 2019 Storj Labs, Inc.
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// See LICENSE for copying information.
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// Package dbschema package implements querying and comparing schemas for testing.
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package dbschema
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import (
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"database/sql"
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"sort"
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)
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// Queryer is a representation for something that can query.
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type Queryer interface {
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// Query executes a query that returns rows, typically a SELECT.
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Query(query string, args ...interface{}) (*sql.Rows, error)
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}
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// Schema is the database structure.
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type Schema struct {
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Tables []*Table
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Indexes []*Index
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}
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// Table is a sql table.
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type Table struct {
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Name string
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Columns []*Column
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PrimaryKey []string
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Unique [][]string
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}
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// Column is a sql column.
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type Column struct {
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Name string
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Type string
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IsNullable bool
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Reference *Reference
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}
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// Reference is a column foreign key.
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type Reference struct {
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Table string
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Column string
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OnDelete string
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OnUpdate string
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}
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// Index is an index for a table.
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type Index struct {
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Name string
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Table string
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Columns []string
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Unique bool
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}
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// EnsureTable returns the table with the specified name and creates one if needed.
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func (schema *Schema) EnsureTable(tableName string) *Table {
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for _, table := range schema.Tables {
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if table.Name == tableName {
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return table
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}
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}
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table := &Table{Name: tableName}
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schema.Tables = append(schema.Tables, table)
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return table
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}
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// DropTable removes the specified table
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func (schema *Schema) DropTable(tableName string) {
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for i, table := range schema.Tables {
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if table.Name == tableName {
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schema.Tables = append(schema.Tables[:i], schema.Tables[i+1:]...)
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return
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}
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}
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}
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// AddColumn adds the column to the table.
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func (table *Table) AddColumn(column *Column) {
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table.Columns = append(table.Columns, column)
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}
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// FindColumn finds a column in the table
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func (table *Table) FindColumn(columnName string) (*Column, bool) {
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for _, column := range table.Columns {
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if column.Name == columnName {
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return column, true
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}
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}
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return nil, false
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}
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// ColumnNames returns column names
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func (table *Table) ColumnNames() []string {
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columns := make([]string, len(table.Columns))
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for i, column := range table.Columns {
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columns[i] = column.Name
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}
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return columns
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}
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// Sort sorts tables
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func (schema *Schema) Sort() {
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sort.Slice(schema.Tables, func(i, k int) bool {
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return schema.Tables[i].Name < schema.Tables[k].Name
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})
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for _, table := range schema.Tables {
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table.Sort()
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}
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}
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// Sort sorts columns, primary keys and unique
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func (table *Table) Sort() {
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sort.Slice(table.Columns, func(i, k int) bool {
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return table.Columns[i].Name < table.Columns[k].Name
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})
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sort.Strings(table.PrimaryKey)
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for i := range table.Unique {
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sort.Strings(table.Unique[i])
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}
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sort.Slice(table.Unique, func(i, k int) bool {
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return lessStrings(table.Unique[i], table.Unique[k])
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})
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}
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func lessStrings(a, b []string) bool {
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n := len(a)
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if len(b) < n {
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n = len(b)
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}
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for k := 0; k < n; k++ {
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if a[k] < b[k] {
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return true
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} else if a[k] > b[k] {
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return false
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}
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}
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return len(a) < len(b)
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}
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