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27.4.5.5 The format_statement() Function

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Given a string (normally representing an SQL statement), reduces it to the length given by the statement_truncate_len configuration option, and returns the result. No truncation occurs if the string is shorter than statement_truncate_len. Otherwise, the middle part of the string is replaced by an ellipsis (...).

This function is useful for formatting possibly lengthy statements retrieved from Performance Schema tables to a known fixed maximum length.

Parameters

  • statement LONGTEXT: The statement to format.

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Configuration Options

format_statement() operation can be modified using the following configuration options or their corresponding user-defined variables (see Section 27.4.2.1, “The sys_config Table”):

  • statement_truncate_len, @sys.statement_truncate_len

    The maximum length of statements returned by the format_statement() function. Longer statements are truncated to this length. The default is 64.

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Return Value

A LONGTEXT value.

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Example

By default, format_statement() truncates statements to be no more than 64 characters. Setting @sys.statement_truncate_len changes the truncation length for the current session:

  1. mysql> SET @stmt = 'SELECT variable, value, set_time, set_by FROM sys_config';
  2. mysql> SELECT sys.format_statement(@stmt);
  3. +----------------------------------------------------------+
  4. | sys.format_statement(@stmt)                              |
  5. +----------------------------------------------------------+
  6. | SELECT variable, value, set_time, set_by FROM sys_config |
  7. +----------------------------------------------------------+
  8. mysql> SET @sys.statement_truncate_len = 32;
  9. mysql> SELECT sys.format_statement(@stmt);
  10. +-----------------------------------+
  11. | sys.format_statement(@stmt)       |
  12. +-----------------------------------+
  13. | SELECT variabl ... ROM sys_config |
  14. +-----------------------------------+

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Document created the 26/06/2006, last modified the 26/10/2018
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