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  • Syntax 2: Performing a transaction on a connection
  • Nesting transactions
  • Locks and transactions
  • Native MySQL Connector
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Stored procedures
SQLTransaction (Function)
In french: SQLTransaction
Begins, commits or rolls back a transaction:
  • on the files of a database opened by SQLConnect,
  • on the files of a database opened by a connection (OLE DB or Native Access/Native Connector) described in the data model editor or by HOpenConnection.
Remark: This function is the only SQL function that can be used with the HFSQL functions (to perform transactions on an external database handled by the HFSQL functions for example).
Versions 18 and later
Android Widget This function is now available in Android widget mode.
New in version 18
Android Widget This function is now available in Android widget mode.
Android Widget This function is now available in Android widget mode.
Remark: From version 19, HFSQL is the new name of HyperFileSQL.
Versions 21 and later
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
New in version 21
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
Versions 24 and later
iPhone/iPad This function is now available for iPhone/iPad applications.
New in version 24
iPhone/iPad This function is now available for iPhone/iPad applications.
iPhone/iPad This function is now available for iPhone/iPad applications.
WINDEVWEBDEV - Server codeReports and QueriesJavaUser code (UMC)AjaxOLE DB
ConnectionNum is int = SQLConnect("MyDatabase", "User", "Password", "", ...
"OLEDB", "MyProvider")
IF ConnectionNum = 0 THEN
SQLInfo()
Error("Error while opening the connection: " + SQL.MesError)
ELSE
// Put the connection in transaction
SQLTransaction(sqlStart)
// Modify the value of all the AFile.AnItem items
IF SQLExec("UPDATE AFile SET AnItem = 'new value", ...
"UpdateQuery") = True THEN
// End the transaction
SQLTransaction(sqlCommit)
ELSE
SQLInfo("UpdateQuery")
Error("Error while running the query: " + SQL.MesError)
// Cancel the transaction
SQLTransaction(sqlRollBack)
// The content of AFile did not change
END
END
Syntax

Transaction on the files of a database opened by SQLConnect Hide the details

<Result> = SQLTransaction(<Indicator>)
<Result>: Boolean
  • True if the operation was performed,
  • False otherwise.
<Indicator>: Integer constant
Type of transaction operation to perform:
sqlStartStarts the transaction.
sqlCommitEnd the transaction.
sqlRollBackCancels the transaction.
Remark: This syntax is not available in Android.
WINDEVWEBDEV - Server codeWINDEV MobileReports and QueriesAndroidAndroid Widget User code (UMC)Ajax

Transaction on the files of a database opened by a connection described in the analysis or by HOpenConnection Hide the details

<Result> = SQLTransaction(<Indicator> , <Connection>)
<Result>: Boolean
  • True if the operation was performed,
  • False otherwise.
<Indicator>: Integer constant
Type of transaction operation to perform:
sqlStartStarts the transaction.
sqlCommitEnd the transaction.
sqlRollBackCancels the transaction.
<Connection>: Character string
Name of connection used to access the database. This name was defined in the data model editor or by HOpenConnection. This connection must have been described during the call to SQLTransaction. If the connection is not opened during the call to SQLTransaction, the specified connection is automatically opened.
Remarks

Syntax 2: Performing a transaction on a connection

To perform a transaction on a connection, you must:
  1. Start the connection (SQLTransaction(sqlStart)).
  2. Perform the operations on the data files with the relevant HFSQL functions.
  3. End the transaction:
    • by validating the operations performed (SQLTransaction(sqlCommit)).
    • by canceling the operations performed (SQLTransaction(sqlRollBack)).

Nesting transactions

Transactions can be nested.
Java Transactions cannot be nested. A WLanguage error occurs if a transaction is started while another transaction is in progress.

Locks and transactions

SQLTransaction does not lock data files or records. SQLTransaction begins, commits or rolls back a transaction.
If a transaction is started:
  • write operations in tables can cause deadlocks (e.g. in an HFSQL database, write operations lock records).
  • read operations can cause deadlocks on some databases if the isolation level is "repeatable-read" or "serializable" (note that this is not the case in HFSQL databases).
WINDEVWEBDEV - Server codeReports and QueriesUser code (UMC)AjaxNative Connectors (Native Accesses)

Native MySQL Connector

SQLLock and SQLTransaction are used to to manage locks and transactions only on "innoDB" MySQL tables.
Component: wd270hf.dll
Minimum version required
  • Version 9
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