gosora/query_gen/lib/transaction.go

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2017-10-31 00:57:57 +00:00
package qgen
import "database/sql"
type transactionStmt struct {
stmt *sql.Stmt
firstErr error // This'll let us chain the methods to reduce boilerplate
}
func newTransactionStmt(stmt *sql.Stmt, err error) *transactionStmt {
return &transactionStmt{stmt, err}
}
func (stmt *transactionStmt) Exec(args ...interface{}) (*sql.Result, error) {
if stmt.firstErr != nil {
return nil, stmt.firstErr
}
return stmt.Exec(args...)
}
type TransactionBuilder struct {
tx *sql.Tx
adapter DB_Adapter
textToStmt map[string]*transactionStmt
}
func (build *TransactionBuilder) SimpleDelete(table string, where string) (stmt *sql.Stmt, err error) {
res, err := build.adapter.SimpleDelete("_builder", table, where)
if err != nil {
return stmt, err
}
return build.tx.Prepare(res)
}
// Quick* versions refer to it being quick to type not the performance. For performance critical transactions, you might want to use the Simple* methods or the *Tx methods on the main builder. Alternate suggestions for names are welcome :)
func (build *TransactionBuilder) QuickDelete(table string, where string) *transactionStmt {
res, err := build.adapter.SimpleDelete("_builder", table, where)
if err != nil {
return newTransactionStmt(nil, err)
}
stmt, ok := build.textToStmt[res]
if ok {
return stmt
}
stmt = newTransactionStmt(build.tx.Prepare(res))
build.textToStmt[res] = stmt
return stmt
}
func (build *TransactionBuilder) SimpleInsert(table string, columns string, fields string) (stmt *sql.Stmt, err error) {
res, err := build.adapter.SimpleInsert("_builder", table, columns, fields)
if err != nil {
return stmt, err
}
return build.tx.Prepare(res)
}
func (build *TransactionBuilder) QuickInsert(table string, where string) *transactionStmt {
res, err := build.adapter.SimpleDelete("_builder", table, where)
if err != nil {
return newTransactionStmt(nil, err)
}
stmt, ok := build.textToStmt[res]
if ok {
return stmt
}
stmt = newTransactionStmt(build.tx.Prepare(res))
build.textToStmt[res] = stmt
return stmt
}