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prepare_stmt.go
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prepare_stmt.go
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package gorm
import (
"context"
"database/sql"
"sync"
)
type PreparedStmtDB struct {
stmts map[string]*sql.Stmt
mux sync.RWMutex
ConnPool
}
func (db *PreparedStmtDB) prepare(query string) (*sql.Stmt, error) {
db.mux.RLock()
if stmt, ok := db.stmts[query]; ok {
db.mux.RUnlock()
return stmt, nil
}
db.mux.RUnlock()
db.mux.Lock()
stmt, err := db.ConnPool.PrepareContext(context.Background(), query)
if err == nil {
db.stmts[query] = stmt
}
db.mux.Unlock()
return stmt, err
}
func (db *PreparedStmtDB) BeginTx(ctx context.Context, opt *sql.TxOptions) (ConnPool, error) {
if beginner, ok := db.ConnPool.(TxBeginner); ok {
tx, err := beginner.BeginTx(ctx, opt)
return &PreparedStmtTX{PreparedStmtDB: db, Tx: tx}, err
}
return nil, ErrInvalidTransaction
}
func (db *PreparedStmtDB) ExecContext(ctx context.Context, query string, args ...interface{}) (sql.Result, error) {
stmt, err := db.prepare(query)
if err == nil {
return stmt.ExecContext(ctx, args...)
}
return nil, err
}
func (db *PreparedStmtDB) QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error) {
stmt, err := db.prepare(query)
if err == nil {
return stmt.QueryContext(ctx, args...)
}
return nil, err
}
func (db *PreparedStmtDB) QueryRowContext(ctx context.Context, query string, args ...interface{}) *sql.Row {
stmt, err := db.prepare(query)
if err == nil {
return stmt.QueryRowContext(ctx, args...)
}
return &sql.Row{}
}
type PreparedStmtTX struct {
*sql.Tx
PreparedStmtDB *PreparedStmtDB
}
func (tx *PreparedStmtTX) ExecContext(ctx context.Context, query string, args ...interface{}) (sql.Result, error) {
stmt, err := tx.PreparedStmtDB.prepare(query)
if err == nil {
return tx.Tx.Stmt(stmt).ExecContext(ctx, args...)
}
return nil, err
}
func (tx *PreparedStmtTX) QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error) {
stmt, err := tx.PreparedStmtDB.prepare(query)
if err == nil {
return tx.Tx.Stmt(stmt).QueryContext(ctx, args...)
}
return nil, err
}
func (tx *PreparedStmtTX) QueryRowContext(ctx context.Context, query string, args ...interface{}) *sql.Row {
stmt, err := tx.PreparedStmtDB.prepare(query)
if err == nil {
return tx.Tx.Stmt(stmt).QueryRowContext(ctx, args...)
}
return &sql.Row{}
}