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Diffstat (limited to '')
-rw-r--r-- | src/go/plugin/go.d/modules/postgres/do_query.go | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/src/go/plugin/go.d/modules/postgres/do_query.go b/src/go/plugin/go.d/modules/postgres/do_query.go new file mode 100644 index 000000000..3b90be0d7 --- /dev/null +++ b/src/go/plugin/go.d/modules/postgres/do_query.go @@ -0,0 +1,78 @@ +// SPDX-License-Identifier: GPL-3.0-or-later + +package postgres + +import ( + "context" + "database/sql" +) + +func (p *Postgres) doQueryRow(query string, v any) error { + ctx, cancel := context.WithTimeout(context.Background(), p.Timeout.Duration()) + defer cancel() + + return p.db.QueryRowContext(ctx, query).Scan(v) +} + +func (p *Postgres) doDBQueryRow(db *sql.DB, query string, v any) error { + ctx, cancel := context.WithTimeout(context.Background(), p.Timeout.Duration()) + defer cancel() + + return db.QueryRowContext(ctx, query).Scan(v) +} + +func (p *Postgres) doQuery(query string, assign func(column, value string, rowEnd bool)) error { + return p.doDBQuery(p.db, query, assign) +} + +func (p *Postgres) doDBQuery(db *sql.DB, query string, assign func(column, value string, rowEnd bool)) error { + ctx, cancel := context.WithTimeout(context.Background(), p.Timeout.Duration()) + defer cancel() + + rows, err := db.QueryContext(ctx, query) + if err != nil { + return err + } + defer func() { _ = rows.Close() }() + + return readRows(rows, assign) +} + +func readRows(rows *sql.Rows, assign func(column, value string, rowEnd bool)) error { + if assign == nil { + return nil + } + + columns, err := rows.Columns() + if err != nil { + return err + } + + values := makeValues(len(columns)) + + for rows.Next() { + if err := rows.Scan(values...); err != nil { + return err + } + for i, l := 0, len(values); i < l; i++ { + assign(columns[i], valueToString(values[i]), i == l-1) + } + } + return rows.Err() +} + +func valueToString(value any) string { + v, ok := value.(*sql.NullString) + if !ok || !v.Valid { + return "" + } + return v.String +} + +func makeValues(size int) []any { + vs := make([]any, size) + for i := range vs { + vs[i] = &sql.NullString{} + } + return vs +} |