How thinkphp outputs sql statements

ThinkPHP's SQL debugging

The Db class library is a very convenient class library provided by ThinkPHP that can be used to process SQL statements. This class library integrates a large number of functions for convenient database operation. By using this library, we can easily build and execute SQL queries. During this process, in order to debug or optimize the application, we need to print or output the query statement. The next section will detail how to output SQL statements.

Output a SQL query

When we execute a query operation, we want to view the executed SQL statement. SQL statements can be output through the following code:

// 假设$table为数据表名
$result = Db::table($table)->select();
echo Db::getLastSql();

Through the getLastSql() function, we can obtain the last executed SQL statement.

Output a SQL update command

When executing the SQL update command, we also need to check the SQL statement used. Use the following code to output the SQL statement:

// 假设$table为数据表名
$result = Db::table($table)->where('id', $id)->update($data);
echo Db::getLastSql();

Through the getLastSql() function, we can get the last executed SQL statement.

Output native SQL statement

When using a native SQL statement, you can call the query() function to execute the statement. We can also output the last executed SQL statement by calling the getLastSql() function. As shown below:

$sql = "SELECT * FROM `table_name` WHERE id = 1";
$result = Db::query($sql);
echo Db::getLastSql();

Through the query() function and getLastSql() function, we can get the most recently executed SQL statement.

Disable SQL statement logging

When we need to disable debugging in a production environment, we can use the method: config('app_debug', false), as follows:

//禁用调试模式
config('app_debug', false);

Disabling debug mode in a production environment can speed up the application while also reducing the risk of call information exposure.

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