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PHP : Function Reference : IBM DB2, Cloudscape and Apache Derby Functions : db2_rollback

db2_rollback

Rolls back a transaction (PECL ibm_db2:1.0-1.6.2)
bool db2_rollback ( resource connection )

Example 951. Rolling back a DELETE statement

In the following example, we count the number of rows in a table, turn off AUTOCOMMIT mode on a database connection, delete all of the rows in the table and return the count of 0 to prove that the rows have been removed. We then issue db2_rollback() and return the updated count of rows in the table to show that the number is the same as before we issued the DELETE statement. The return to the original state of the table demonstrates that the roll back of the transaction succeeded.

<?php
$conn
= db2_connect($database, $user, $password);

if (
$conn) {
   
$stmt = db2_exec($conn, "SELECT count(*) FROM animals");
   
$res = db2_fetch_array( $stmt );
   echo
$res[0] . "\n";
   
   
// Turn AUTOCOMMIT off
   
db2_autocommit($conn, DB2_AUTOCOMMIT_OFF);
 
   
// Delete all rows from ANIMALS
   
db2_exec($conn, "DELETE FROM animals");
   
   
$stmt = db2_exec($conn, "SELECT count(*) FROM animals");
   
$res = db2_fetch_array( $stmt );
   echo
$res[0] . "\n";
   
   
// Roll back the DELETE statement
   
db2_rollback( $conn );
   
   
$stmt = db2_exec( $conn, "SELECT count(*) FROM animals" );
   
$res = db2_fetch_array( $stmt );
   echo
$res[0] . "\n";
   
db2_close($conn);
}
?>

The above example will output:

7
0
7

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db2_autocommit
db2_bind_param
db2_client_info
db2_close
db2_column_privileges
db2_columns
db2_commit
db2_conn_error
db2_conn_errormsg
db2_connect
db2_cursor_type
db2_escape_string
db2_exec
db2_execute
db2_fetch_array
db2_fetch_assoc
db2_fetch_both
db2_fetch_object
db2_fetch_row
db2_field_display_size
db2_field_name
db2_field_num
db2_field_precision
db2_field_scale
db2_field_type
db2_field_width
db2_foreign_keys
db2_free_result
db2_free_stmt
db2_get_option
db2_lob_read
db2_next_result
db2_num_fields
db2_num_rows
db2_pconnect
db2_prepare
db2_primary_keys
db2_procedure_columns
db2_procedures
db2_result
db2_rollback
db2_server_info
db2_set_option
db2_special_columns
db2_statistics
db2_stmt_error
db2_stmt_errormsg
db2_table_privileges
db2_tables
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