查询日志 - db enable

Introduction

In PHP, a common task for programmers is to retrieve information from a database. One useful function for this is db enable, which allows you to query the database logs for information.

Syntax

resource db2_enable_log (resource $connection [, string $filename [, int $flags ]])

Parameters

• connection: A valid database connection resource, returned by db2_connect() or db2_pconnect().
• filename: The filename for the log file. Default is db2inst1.log.
• flags: A bitmask of options. Possible values are:
  • DB2_LOG_READ: Read log only.
  • DB2_LOG_WRITE: Write to log only.
  • DB2_LOG_OVERWRITE: Overwrite existing log file.

Return Value

Returns TRUE on success or FALSE on failure.

Example

<?php
// Connect to the database
$conn = db2_connect($database, $user, $password);

// Enable logging
if (db2_enable_log($conn)) {
    echo "Logging enabled\n";
}

// Perform a query
$stmt = db2_prepare($conn, "SELECT * FROM users WHERE id = ?");
db2_execute($stmt, array(1));

// Disable logging
db2_disable_log($conn);

// Retrieve log information
$log = db2_get_log_file($conn);
echo "Log file contents:\n";
echo "-------------------\n";
echo $log;
?>

Conclusion

db enable is a valuable tool for retrieving information from database logs in PHP. By following the syntax and parameters outlined above, you can use this function to perform queries and retrieve relevant information.