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# sesam_settransaction

(PHP 3 CVS only)

sesam_settransaction -- Set SESAM transaction parameters

## 说明

bool sesam_settransaction ( int isolation_level, int read_only )

Overrides the default values for the `isolation level` and `read-only` transaction parameters (which are set in the SESAM configuration file), in order to optimize subsequent queries and guarantee database consistency. The overridden values are used for the next transaction only. See the SESAM handbook for detailed explanation of the semantics.

This function can only be called before starting a transaction, not after the transaction has been started already.

The values set by sesam_settransaction() will override the default setting specified in the SESAM configuration file.

## 参数

`isolation_level`

  表 1. Valid values for `isolation_level` parameter

  Value | Constant | Meaning
  --- | --- | ---
  1 | `SESAM_TXISOL_READ_UNCOMMITTED` | Read Uncommitted
  2 | `SESAM_TXISOL_READ_COMMITTED` | Read Committed
  3 | `SESAM_TXISOL_REPEATABLE_READ` | Repeatable Read
  4 | `SESAM_TXISOL_SERIALIZABLE` | Serializable

`read_only`

  表 2. Valid values for `read_only` parameter

  Value | Constant | Meaning
  --- | --- | ---
  0 | `SESAM_TXREAD_READWRITE` | Read/Write
  1 | `SESAM_TXREAD_READONLY` | Read-Only

## 返回值

Returns `TRUE` if the values are valid, and the `settransaction` operation was successful, `FALSE` otherwise.

## 范例

例 1. Setting SESAM transaction parameters

`<?php sesam_settransaction (SESAM_TXISOL_REPEATABLE_READ, SESAM_TXREAD_READONLY); ?>`

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