Difference between revisions of "Portable SQL/Statements/Transactions"
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| − | == | + | == Starting transactions == |
| − | + | The ANSI SQL standard defines a statement for starting new transactions: | |
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| + | START TRANSACTION | ||
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| + | Unfortunately, database vendors use various different statements for starting transactions and there is no single string that fits for all. | ||
{| class="wikitable" | {| class="wikitable" | ||
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! MySQL | ! MySQL | ||
| − | | BEGIN | + | | BEGIN [WORK], START TRANSACTION (4.0.11) |
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! Oracle | ! Oracle | ||
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! PostgreSQL | ! PostgreSQL | ||
| − | | BEGIN | + | | BEGIN, SET TRANSACTION mode |
|- | |- | ||
! SQLite | ! SQLite | ||
| − | | BEGIN | + | | BEGIN [TRANSACTION] |
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! SQL Server | ! SQL Server | ||
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| BEGIN TRANSACTION | | BEGIN TRANSACTION | ||
|} | |} | ||
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| + | The statement which fits for the most popular Open Source databases is BEGIN because it is understood by MySQL, PostgreSQL and SQLite. | ||
== Saving changes == | == Saving changes == | ||
Revision as of 22:37, 6 May 2007
Starting transactions
The ANSI SQL standard defines a statement for starting new transactions:
START TRANSACTION
Unfortunately, database vendors use various different statements for starting transactions and there is no single string that fits for all.
| Database | Statement |
|---|---|
| Firebird | SET TRANSACTION |
| MySQL | BEGIN [WORK], START TRANSACTION (4.0.11) |
| Oracle | SET TRANSACTION ISOLATION LEVEL READ COMMITTED |
| PostgreSQL | BEGIN, SET TRANSACTION mode |
| SQLite | BEGIN [TRANSACTION] |
| SQL Server | BEGIN TRANSACTION |
| Sybase ASE | BEGIN TRANSACTION |
The statement which fits for the most popular Open Source databases is BEGIN because it is understood by MySQL, PostgreSQL and SQLite.
Saving changes
Making the changes done within a transaction permanent is easily done with a single statement for all databases:
COMMIT
Discarding changes
To undo all changes done within a transaction is as easy as committing them. A single statement for all databases exists:
ROLLBACK
Back to Overview
