status-go/wakuv2/persistence/queries.go

94 lines
2.4 KiB
Go

package persistence
import (
"database/sql"
"fmt"
)
// Queries are the sqlite queries for a given table.
type Queries struct {
deleteQuery string
existsQuery string
getQuery string
putQuery string
queryQuery string
prefixQuery string
limitQuery string
offsetQuery string
getSizeQuery string
}
// NewQueries creates a new set of queries for the passed table
func NewQueries(tbl string, db *sql.DB) (*Queries, error) {
err := CreateTable(db, tbl)
if err != nil {
return nil, err
}
return &Queries{
deleteQuery: fmt.Sprintf("DELETE FROM %s WHERE key = $1", tbl),
existsQuery: fmt.Sprintf("SELECT exists(SELECT 1 FROM %s WHERE key=$1)", tbl),
getQuery: fmt.Sprintf("SELECT data FROM %s WHERE key = $1", tbl),
putQuery: fmt.Sprintf("INSERT INTO %s (key, data) VALUES ($1, $2) ON CONFLICT (key) DO UPDATE SET data = $2", tbl),
queryQuery: fmt.Sprintf("SELECT key, data FROM %s", tbl),
prefixQuery: ` WHERE key LIKE '%s%%' ORDER BY key`,
limitQuery: ` LIMIT %d`,
offsetQuery: ` OFFSET %d`,
getSizeQuery: fmt.Sprintf("SELECT length(data) FROM %s WHERE key = $1", tbl),
}, nil
}
// Delete returns the query for deleting a row.
func (q Queries) Delete() string {
return q.deleteQuery
}
// Exists returns the query for determining if a row exists.
func (q Queries) Exists() string {
return q.existsQuery
}
// Get returns the query for getting a row.
func (q Queries) Get() string {
return q.getQuery
}
// Put returns the query for putting a row.
func (q Queries) Put() string {
return q.putQuery
}
// Query returns the query for getting multiple rows.
func (q Queries) Query() string {
return q.queryQuery
}
// Prefix returns the query fragment for getting a rows with a key prefix.
func (q Queries) Prefix() string {
return q.prefixQuery
}
// Limit returns the query fragment for limiting results.
func (q Queries) Limit() string {
return q.limitQuery
}
// Offset returns the query fragment for returning rows from a given offset.
func (q Queries) Offset() string {
return q.offsetQuery
}
// GetSize returns the query for determining the size of a value.
func (q Queries) GetSize() string {
return q.getSizeQuery
}
// CreateTable creates the table that will persist the peers
func CreateTable(db *sql.DB, tableName string) error {
sqlStmt := fmt.Sprintf("CREATE TABLE IF NOT EXISTS %s (key TEXT NOT NULL UNIQUE, data BYTEA);", tableName)
_, err := db.Exec(sqlStmt)
if err != nil {
return err
}
return nil
}