| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package postgres |
| 4 | |
| 5 | import "database/sql" |
| 6 | |
| 7 | func (c *Collector) doQueryColumns() error { |
| 8 | if err := c.doDBQueryColumns(c.db); err != nil { |
| 9 | c.Warning(err) |
| 10 | } |
| 11 | for _, conn := range c.dbConns { |
| 12 | if conn.db == nil { |
| 13 | continue |
| 14 | } |
| 15 | if err := c.doDBQueryColumns(conn.db); err != nil { |
| 16 | c.Warning(err) |
| 17 | } |
| 18 | } |
| 19 | return nil |
| 20 | } |
| 21 | |
| 22 | func (c *Collector) doDBQueryColumns(db *sql.DB) error { |
| 23 | q := queryColumnsStats() |
| 24 | |
| 25 | for _, m := range c.mx.tables { |
| 26 | if m.nullColumns != nil { |
| 27 | m.nullColumns = new(int64(0)) |
| 28 | } |
| 29 | } |
| 30 | |
| 31 | var dbname, schema, table string |
| 32 | var nullPerc int64 |
| 33 | return c.doDBQuery(db, q, func(column, value string, rowEnd bool) { |
| 34 | switch column { |
| 35 | case "datname": |
| 36 | dbname = value |
| 37 | case "schemaname": |
| 38 | schema = value |
| 39 | case "relname": |
| 40 | table = value |
| 41 | case "null_percent": |
| 42 | nullPerc = parseInt(value) |
| 43 | } |
| 44 | if !rowEnd { |
| 45 | return |
| 46 | } |
| 47 | if nullPerc == 100 && c.hasTableMetrics(table, dbname, schema) { |
| 48 | v := c.getTableMetrics(table, dbname, schema) |
| 49 | if v.nullColumns == nil { |
| 50 | v.nullColumns = new(int64(0)) |
| 51 | } |
| 52 | *v.nullColumns++ |
| 53 | } |
| 54 | }) |
| 55 | } |