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