forked from mirror/gorm
137 lines
3.2 KiB
Go
137 lines
3.2 KiB
Go
package gorm
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import (
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"context"
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"database/sql"
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"sync"
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)
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type PreparedStmtDB struct {
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Stmts map[string]*sql.Stmt
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PreparedSQL []string
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mux sync.RWMutex
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ConnPool
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}
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func (db *PreparedStmtDB) Close() {
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db.mux.Lock()
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for _, query := range db.PreparedSQL {
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if stmt, ok := db.Stmts[query]; ok {
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delete(db.Stmts, query)
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stmt.Close()
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}
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}
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db.mux.Unlock()
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}
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func (db *PreparedStmtDB) prepare(query string) (*sql.Stmt, error) {
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db.mux.RLock()
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if stmt, ok := db.Stmts[query]; ok {
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db.mux.RUnlock()
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return stmt, nil
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}
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db.mux.RUnlock()
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db.mux.Lock()
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// double check
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if stmt, ok := db.Stmts[query]; ok {
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db.mux.Unlock()
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return stmt, nil
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}
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stmt, err := db.ConnPool.PrepareContext(context.Background(), query)
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if err == nil {
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db.Stmts[query] = stmt
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db.PreparedSQL = append(db.PreparedSQL, query)
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}
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db.mux.Unlock()
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return stmt, err
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}
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func (db *PreparedStmtDB) BeginTx(ctx context.Context, opt *sql.TxOptions) (ConnPool, error) {
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if beginner, ok := db.ConnPool.(TxBeginner); ok {
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tx, err := beginner.BeginTx(ctx, opt)
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return &PreparedStmtTX{PreparedStmtDB: db, Tx: tx}, err
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}
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return nil, ErrInvalidTransaction
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}
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func (db *PreparedStmtDB) ExecContext(ctx context.Context, query string, args ...interface{}) (result sql.Result, err error) {
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stmt, err := db.prepare(query)
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if err == nil {
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result, err = stmt.ExecContext(ctx, args...)
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if err != nil {
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db.mux.Lock()
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stmt.Close()
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delete(db.Stmts, query)
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db.mux.Unlock()
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}
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}
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return result, err
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}
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func (db *PreparedStmtDB) QueryContext(ctx context.Context, query string, args ...interface{}) (rows *sql.Rows, err error) {
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stmt, err := db.prepare(query)
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if err == nil {
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rows, err = stmt.QueryContext(ctx, args...)
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if err != nil {
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db.mux.Lock()
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stmt.Close()
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delete(db.Stmts, query)
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db.mux.Unlock()
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}
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}
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return rows, err
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}
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func (db *PreparedStmtDB) QueryRowContext(ctx context.Context, query string, args ...interface{}) *sql.Row {
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stmt, err := db.prepare(query)
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if err == nil {
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return stmt.QueryRowContext(ctx, args...)
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}
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return &sql.Row{}
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}
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type PreparedStmtTX struct {
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*sql.Tx
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PreparedStmtDB *PreparedStmtDB
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}
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func (tx *PreparedStmtTX) ExecContext(ctx context.Context, query string, args ...interface{}) (result sql.Result, err error) {
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stmt, err := tx.PreparedStmtDB.prepare(query)
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if err == nil {
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result, err = tx.Tx.Stmt(stmt).ExecContext(ctx, args...)
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if err != nil {
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tx.PreparedStmtDB.mux.Lock()
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stmt.Close()
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delete(tx.PreparedStmtDB.Stmts, query)
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tx.PreparedStmtDB.mux.Unlock()
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}
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}
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return result, err
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}
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func (tx *PreparedStmtTX) QueryContext(ctx context.Context, query string, args ...interface{}) (rows *sql.Rows, err error) {
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stmt, err := tx.PreparedStmtDB.prepare(query)
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if err == nil {
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rows, err = tx.Tx.Stmt(stmt).QueryContext(ctx, args...)
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if err != nil {
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tx.PreparedStmtDB.mux.Lock()
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stmt.Close()
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delete(tx.PreparedStmtDB.Stmts, query)
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tx.PreparedStmtDB.mux.Unlock()
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}
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}
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return rows, err
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}
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func (tx *PreparedStmtTX) QueryRowContext(ctx context.Context, query string, args ...interface{}) *sql.Row {
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stmt, err := tx.PreparedStmtDB.prepare(query)
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if err == nil {
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return tx.Tx.Stmt(stmt).QueryRowContext(ctx, args...)
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}
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return &sql.Row{}
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}
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