api:dk11:delphi:gissqlquery.tgis_sqlquery
Table of Contents
TGIS_SqlQuery class
DK11 for Delphi | GisSqlQuery.TGIS_SqlQuery | Classes | Constructors | Methods | Properties
Calculates a logical value of WHERE-like statements for non SQL-based tables.
Syntax
// Delphi type TGIS_SqlQuery = class( TGIS_Object ) end;
// C++ Builder class PASCALIMPLEMENTATION TGIS_SqlQuery : public TGIS_Object { };
Inheritance
→ TObject → TGIS_Object
Constructors
Methods
Inherited
Overrides
Protected
Private
| Name | Visibility | Description | |
|---|---|---|---|
| BindSqlQueryCallBack | public | A callback to be executed form TGIS_LayerVector upon binding layer to the SQL query object (connecting field access methods) | |
| Parse(TGIS_SqlQueryFieldFun; TGIS_SqlQueryBindFun; TGIS_SqlQueryFieldBindFun; TObject; Integer) | public | Parse each record. | |
| Parse(TObject; Integer) | public | Parse each record. | |
| ParseAsBoolean(TGIS_SqlQueryFieldFun; TGIS_SqlQueryBindFun; TGIS_SqlQueryFieldBindFun; TObject; Boolean; Integer) | public | Parse each record and cast result as boolean. | |
| ParseAsBoolean(TObject; Boolean; Integer) | public | Parse each record and cast result as boolean. | |
| ParseAsFloat(TGIS_SqlQueryFieldFun; TGIS_SqlQueryBindFun; TGIS_SqlQueryFieldBindFun; TObject; Double; Integer) | public | Parse each record and cast result as float. | |
| ParseAsFloat(TObject; Double; Integer) | public | Parse each record and cast result as float. | |
| Prepare | public | Calling once per scope. | |
| RePrepare | public | RePrepare precompiled a query. | |
Properties
Remarks
Supported operators are:
- AND
- OR
- NOT
- =
- <>
- <
- ⇐
- >
- >=
- +
- -
- *
- /
- %
- BETWEEN..AND
- IN
- IS NULL
- IS NOT NULL
Supported math functions are:
- ABS()
- ASIN()
- ACOS()
- ATAN()
- CEIL()
- COS()
- DEGREES()
- EXP()
- FLOOR()
- LN()
- LOG()
- LOG10()
- PI()
- POWER()
- RADIANS()
- ROUND()
- SIN()
- SQRT()
- TAN()
- TRUNC()
Supported string functions are:
- LENGTH()
- UPPER()
- LOWER()
- STRPOS()
- SUBSTR()
- LEFT()
- RIGHT()
- TRIM()
To guarantee query compatibility across different SQL servers Date should be encoded using predefined functions:
- $date(year[,month][,date])
- $time(hour[,minutes][,seconds][,miliseconds])
- $datetime(year[,month][,date][,hour][,minutes][,seconds][,miliseconds])
- $today
- $now
2019/04/26 15:18