work on optimising vcenter queries

db/queries/models.go

@@ -59,6 +59,15 @@ type InventoryHistory struct {
 	PreviousProvisionedDisk sql.NullFloat64 `db:"PreviousProvisionedDisk" json:"PreviousProvisionedDisk"`
 }
 
+type PragmaTableInfo struct {
+	Cid       sql.NullInt64  `db:"cid" json:"cid"`
+	Name      sql.NullString `db:"name" json:"name"`
+	Type      sql.NullString `db:"type" json:"type"`
+	Notnull   sql.NullInt64  `db:"notnull" json:"notnull"`
+	DfltValue sql.NullString `db:"dflt_value" json:"dflt_value"`
+	Pk        sql.NullInt64  `db:"pk" json:"pk"`
+}
+
 type SnapshotRegistry struct {
 	ID           int64  `db:"id" json:"id"`
 	SnapshotType string `db:"snapshot_type" json:"snapshot_type"`
@@ -66,6 +75,14 @@ type SnapshotRegistry struct {
 	SnapshotTime int64  `db:"snapshot_time" json:"snapshot_time"`
 }
 
+type SqliteMaster struct {
+	Type     sql.NullString `db:"type" json:"type"`
+	Name     sql.NullString `db:"name" json:"name"`
+	TblName  sql.NullString `db:"tbl_name" json:"tbl_name"`
+	Rootpage sql.NullInt64  `db:"rootpage" json:"rootpage"`
+	Sql      sql.NullString `db:"sql" json:"sql"`
+}
+
 type Update struct {
 	Uid                int64           `db:"Uid" json:"Uid"`
 	InventoryId        sql.NullInt64   `db:"InventoryId" json:"InventoryId"`

db/queries/query.sql

@@ -119,3 +119,13 @@ INSERT INTO inventory_history (
     ?, ?, ?, ?, ?, ?, ?
 )
 RETURNING *;
+
+-- name: SqliteTableExists :one
+SELECT COUNT(1) AS count
+FROM sqlite_master
+WHERE type = 'table' AND name = sqlc.arg('table_name');
+
+-- name: SqliteColumnExists :one
+SELECT COUNT(1) AS count
+FROM pragma_table_info
+WHERE name = sqlc.arg('column_name');

db/queries/query.sql.go

@@ -876,6 +876,32 @@ func (q *Queries) ListUnprocessedEvents(ctx context.Context, eventtime sql.NullI
 	return items, nil
 }
 
+const sqliteColumnExists = `-- name: SqliteColumnExists :one
+SELECT COUNT(1) AS count
+FROM pragma_table_info
+WHERE name = ?1
+`
+
+func (q *Queries) SqliteColumnExists(ctx context.Context, columnName sql.NullString) (int64, error) {
+	row := q.db.QueryRowContext(ctx, sqliteColumnExists, columnName)
+	var count int64
+	err := row.Scan(&count)
+	return count, err
+}
+
+const sqliteTableExists = `-- name: SqliteTableExists :one
+SELECT COUNT(1) AS count
+FROM sqlite_master
+WHERE type = 'table' AND name = ?1
+`
+
+func (q *Queries) SqliteTableExists(ctx context.Context, tableName sql.NullString) (int64, error) {
+	row := q.db.QueryRowContext(ctx, sqliteTableExists, tableName)
+	var count int64
+	err := row.Scan(&count)
+	return count, err
+}
+
 const updateEventsProcessed = `-- name: UpdateEventsProcessed :exec
 UPDATE events
 SET "Processed" = 1