Golang ShowTables示例

示例#1

文件： show.go 项目： earlredwolf/cockroach

// ShowTables returns all the tables.
// Privileges: None.
//   Notes: postgres does not have a SHOW TABLES statement.
//          mysql only returns tables you have privileges on.
func (p *planner) ShowTables(n *parser.ShowTables) (planNode, error) {
	// TODO(pmattis): This could be implemented as:
	//
	//   SELECT name FROM system.namespace
	//     WHERE parentID = (SELECT id FROM system.namespace
	//                       WHERE parentID = 0 AND name = <database>)

	if n.Name == nil {
		if p.session.Database == "" {
			return nil, errNoDatabase
		}
		n.Name = &parser.QualifiedName{Base: parser.Name(p.session.Database)}
	}
	dbDesc, err := p.getDatabaseDesc(string(n.Name.Base))
	if err != nil {
		return nil, err
	}

	tableNames, err := p.getTableNames(dbDesc)
	if err != nil {
		return nil, err
	}
	v := &valuesNode{columns: []string{"Table"}}
	for _, name := range tableNames {
		v.rows = append(v.rows, []parser.Datum{parser.DString(name.Table())})
	}

	return v, nil
}

示例#2

文件： server.go 项目： zmoon111/cockroach

// ShowTables returns all the tables.
func (s *Server) ShowTables(session *Session, p *parser.ShowTables, args []sqlwire.Datum, resp *sqlwire.Response) error {
	if p.Name == nil {
		if session.Database == "" {
			return errNoDatabase
		}
		p.Name = append(p.Name, session.Database)
	}
	dbID, err := s.lookupDatabase(p.Name.String())
	if err != nil {
		return err
	}
	prefix := keys.MakeNameMetadataKey(dbID, "")
	sr, err := s.db.Scan(prefix, prefix.PrefixEnd(), 0)
	if err != nil {
		return err
	}
	var rows []sqlwire.Result_Row

	for _, row := range sr {
		name := string(bytes.TrimPrefix(row.Key, prefix))
		rows = append(rows, sqlwire.Result_Row{
			Values: []sqlwire.Datum{
				{StringVal: &name},
			},
		})
	}
	resp.Results = []sqlwire.Result{
		{
			Columns: []string{"tables"},
			Rows:    rows,
		},
	}
	return nil
}

示例#3

文件： conn.go 项目： MarkBruns/NNO.tw

func (c *conn) ShowTables(p *parser.ShowTables, args []driver.Value) (*rows, error) {
	if p.Name == "" {
		if c.database == "" {
			return nil, fmt.Errorf("no database specified")
		}
		p.Name = c.database
	}
	dbID, err := c.lookupDatabase(p.Name)
	if err != nil {
		return nil, err
	}
	prefix := keys.MakeNameMetadataKey(dbID, "")
	sr, err := c.db.Scan(prefix, prefix.PrefixEnd(), 0)
	if err != nil {
		return nil, err
	}
	names := make([]string, len(sr))
	for i, row := range sr {
		names[i] = string(bytes.TrimPrefix(row.Key, prefix))
	}
	return &rows{
		columns: []string{"tables"},
		rows:    names,
		pos:     -1,
	}, nil
}

示例#4

文件： show.go 项目： arypurnomoz/cockroach

// ShowTables returns all the tables.
func (p *planner) ShowTables(n *parser.ShowTables) (planNode, error) {
	if n.Name == nil {
		if p.session.Database == "" {
			return nil, errNoDatabase
		}
		n.Name = &parser.QualifiedName{Base: parser.Name(p.session.Database)}
	}
	dbDesc, err := p.getDatabaseDesc(n.Name.String())
	if err != nil {
		return nil, err
	}
	prefix := keys.MakeNameMetadataKey(dbDesc.ID, "")
	sr, err := p.db.Scan(prefix, prefix.PrefixEnd(), 0)
	if err != nil {
		return nil, err
	}
	v := &valuesNode{columns: []string{"Table"}}
	for _, row := range sr {
		name := string(bytes.TrimPrefix(row.Key, prefix))
		v.rows = append(v.rows, []parser.Datum{parser.DString(name)})
	}
	return v, nil
}

示例#5

文件： show.go 项目： ajayaa/cockroach

// ShowTables returns all the tables.
// Privileges: None.
//   Notes: postgres does not have a SHOW TABLES statement.
//          mysql only returns tables you have privileges on.
func (p *planner) ShowTables(n *parser.ShowTables) (planNode, error) {
	if n.Name == nil {
		if p.session.Database == "" {
			return nil, errNoDatabase
		}
		n.Name = &parser.QualifiedName{Base: parser.Name(p.session.Database)}
	}
	dbDesc, err := p.getDatabaseDesc(n.Name.String())
	if err != nil {
		return nil, err
	}

	tableNames, err := p.getTableNames(dbDesc)
	if err != nil {
		return nil, err
	}
	v := &valuesNode{columns: []string{"Table"}}
	for _, name := range tableNames {
		v.rows = append(v.rows, []parser.Datum{parser.DString(name.Table())})
	}

	return v, nil
}

示例#6

文件： server.go 项目： Gardenya/cockroach

// ShowTables returns all the tables.
func (s *Server) ShowTables(p *parser.ShowTables, args []sqlwire.Datum, resp *sqlwire.Response) {
	if p.Name == "" {
		if s.database == "" {
			resp.SetGoError(errors.New("no database specified"))
			return
		}
		p.Name = s.database
	}
	dbID, err := s.lookupDatabase(p.Name)
	if err != nil {
		resp.SetGoError(err)
		return
	}
	prefix := keys.MakeNameMetadataKey(dbID, "")
	sr, err := s.db.Scan(prefix, prefix.PrefixEnd(), 0)
	if err != nil {
		resp.SetGoError(err)
		return
	}
	var rows []sqlwire.Result_Row

	for _, row := range sr {
		name := string(bytes.TrimPrefix(row.Key, prefix))
		rows = append(rows, sqlwire.Result_Row{
			Values: []sqlwire.Datum{
				{StringVal: &name},
			},
		})
	}
	resp.Results = []sqlwire.Result{
		{
			Columns: []string{"tables"},
			Rows:    rows,
		},
	}
}