[Overview][Constants][Types][Classes][Procedures and functions][Variables][Index] | Reference for unit 'DB' (#fcl)

# TParams.ParseSQL

Parse SQL statement, replacing parameter names with SQL parameter placeholders

## Declaration

Source position: db.pas line 1329

`public function TParams.ParseSQL(`
`SQL: string;`
`DoCreate: Boolean`
`):string; overload; function TParams.ParseSQL(`
`SQL: string;`
`DoCreate: Boolean;`
`EscapeSlash: Boolean;`
`EscapeRepeat: Boolean;`
`ParameterStyle: TParamStyle`
`):string; overload; function TParams.ParseSQL(`
`SQL: string;`
`DoCreate: Boolean;`
`EscapeSlash: Boolean;`
`EscapeRepeat: Boolean;`
`ParameterStyle: TParamStyle;`
`out ParamBinding: TParamBinding`
`):string; overload; function TParams.ParseSQL(`
`SQL: string;`
`DoCreate: Boolean;`
`EscapeSlash: Boolean;`
`EscapeRepeat: Boolean;`
`ParameterStyle: TParamStyle;`
`out ParamBinding: TParamBinding;`
`out ReplaceString: string`
`):string; overload; function TParams.ParseSQL(`
`SQL: string;`
`Options: TSQLParseOptions;`
`ParameterStyle: TParamStyle;`
`out ParamBinding: TParamBinding;`
`MacroChar: Char;`
`out ReplaceString: string`
`):string;`

## Arguments

`SQL` |  | SQL statement to scan for parameter names
`DoCreate` |  | Set to True if TParam instances must be created for the found parameters.

## Function result

SQL statement with parameter names replaced with placeholders

## Arguments

`SQL` |  | SQL statement to scan for parameter names
`DoCreate` |  | Set to True if TParam instances must be created for the found parameters.
`EscapeSlash` |  | True if the backslash character acts as an escape token.
`EscapeRepeat` |  | True if quotes are escaped by specifying them two times.
`ParameterStyle` |  | SQL Placeholder style

## Arguments

`SQL` |  | SQL statement to scan for parameter names
`DoCreate` |  | Set to True if TParam instances must be created for the found parameters.
`EscapeSlash` |  | True if the backslash character acts as an escape token.
`EscapeRepeat` |  | True if quotes are escaped by specifying them two times.
`ParameterStyle` |  | SQL Placeholder style
`ParamBinding` |  | On return, filled with indexes of TParam instances corresponding to the placeholders

## Arguments

`SQL` |  | SQL statement to scan for parameter names
`DoCreate` |  | Set to True if TParam instances must be created for the found parameters.
`EscapeSlash` |  | True if the backslash character acts as an escape token.
`EscapeRepeat` |  | True if quotes are escaped by specifying them two times.
`ParameterStyle` |  | SQL Placeholder style
`ParamBinding` |  | On return, filled with indexes of TParam instances corresponding to the placeholders
`ReplaceString` |  | Placeholder string.

## Arguments

`SQL` |  | SQL statement to scan for parameter names
`Options` |  | Contains the parser options enabled when parsing the SQL statement
`ParameterStyle` |  | SQL Placeholder style
`ParamBinding` |  | On return, filled with indexes of TParam instances corresponding to the placeholders
`MacroChar` |  | Character which triggers expansion of a named macro in the SQL statement
`ReplaceString` |  | Placeholder string.

## Description

ParseSQl parses the SQL statement for parameter names in the form :ParamName. It replaces them with a SQL parameter placeholder. If DoCreate is True then a TParam instance is added to the collection with the found parameter name.

The parameter placeholder is determined by the ParameterStyle property, which can have the following values:

psInterbase
  Parameters are specified by a ? character
psPostgreSQL
  Parameters are specified by a $N character.
psSimulated
  Parameters are specified by a $N character.

psInterbase is the default.

If the EscapeSlash parameter is True, then backslash characters are used to quote the next character in the SQL statement. If it is False, the backslash character is regarded as a normal character.

If the EscapeRepeat parameter is True (the default) then embedded quotes in string literals are escaped by repeating themselves. If it is false then they should be quoted with backslashes.

ParamBinding, if specified, is filled with the indexes of the parameter instances in the parameter collection: for each SQL parameter placeholder, the index of the corresponding TParam instance is returned in the array.

ReplaceString, if specified, contains the placeholder used for the parameter names (by default, $). It has effect only when ParameterStyle equals psSimulated.

The function returns the SQL statement with the parameter names replaced by placeholders.

## See also

TParam |  | Parameter description class
TParam.Name |  | Name of the parameter
TParamStyle |  | Style of parameter