forked from src-d/go-mysql-server
/
showdatabases.go
67 lines (54 loc) · 1.46 KB
/
showdatabases.go
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package plan
import (
"sort"
"strings"
"github.com/xsec-lab/go-mysql-server/sql"
)
// ShowDatabases is a node that shows the databases.
type ShowDatabases struct {
Catalog *sql.Catalog
}
// NewShowDatabases creates a new show databases node.
func NewShowDatabases() *ShowDatabases {
return new(ShowDatabases)
}
// Resolved implements the Resolvable interface.
func (p *ShowDatabases) Resolved() bool {
return true
}
// Children implements the Node interface.
func (*ShowDatabases) Children() []sql.Node {
return nil
}
// Schema implements the Node interface.
func (*ShowDatabases) Schema() sql.Schema {
return sql.Schema{{
Name: "Database",
Type: sql.Text,
Nullable: false,
}}
}
// RowIter implements the Node interface.
func (p *ShowDatabases) RowIter(ctx *sql.Context) (sql.RowIter, error) {
dbs := p.Catalog.AllDatabases()
var rows = make([]sql.Row, 0, len(dbs))
for _, db := range dbs {
if sql.InformationSchemaDatabaseName != db.Name() {
rows = append(rows, sql.Row{db.Name()})
}
}
sort.Slice(rows, func(i, j int) bool {
return strings.Compare(rows[i][0].(string), rows[j][0].(string)) < 0
})
return sql.RowsToRowIter(rows...), nil
}
// WithChildren implements the Node interface.
func (p *ShowDatabases) WithChildren(children ...sql.Node) (sql.Node, error) {
if len(children) != 0 {
return nil, sql.ErrInvalidChildrenNumber.New(p, len(children), 0)
}
return p, nil
}
func (p ShowDatabases) String() string {
return "ShowDatabases"
}