104 lines
2.6 KiB
Go
104 lines
2.6 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)", 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 PRIMARY KEY ON CONFLICT REPLACE, data BYTEA);", tableName)
|
|
_, err := db.Exec(sqlStmt)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func Clean(db *sql.DB, tableName string) error {
|
|
// This is fully controlled by us
|
|
sqlStmt := fmt.Sprintf("DELETE FROM %s;", tableName) // nolint: gosec
|
|
_, err := db.Exec(sqlStmt)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|