129 lines
4.5 KiB
C
129 lines
4.5 KiB
C
/*
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** 2009 November 10
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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**
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** This is the C-language interface definition for the "intarray" or
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** integer array virtual table for SQLite.
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**
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** The intarray virtual table is designed to facilitate using an
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** array of integers as the right-hand side of an IN operator. So
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** instead of doing a prepared statement like this:
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**
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** SELECT * FROM table WHERE x IN (?,?,?,...,?);
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**
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** And then binding indivdual integers to each of ? slots, a C-language
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** application can create an intarray object (named "ex1" in the following
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** example), prepare a statement like this:
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**
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** SELECT * FROM table WHERE x IN ex1;
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**
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** Then bind an ordinary C/C++ array of integer values to the ex1 object
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** to run the statement.
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**
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** USAGE:
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**
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** One or more intarray objects can be created as follows:
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**
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** sqlite3_intarray *p1, *p2, *p3;
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** sqlite3_intarray_create(db, "ex1", &p1);
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** sqlite3_intarray_create(db, "ex2", &p2);
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** sqlite3_intarray_create(db, "ex3", &p3);
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**
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** Each call to sqlite3_intarray_create() generates a new virtual table
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** module and a singleton of that virtual table module in the TEMP
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** database. Both the module and the virtual table instance use the
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** name given by the second parameter. The virtual tables can then be
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** used in prepared statements:
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**
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** SELECT * FROM t1, t2, t3
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** WHERE t1.x IN ex1
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** AND t2.y IN ex2
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** AND t3.z IN ex3;
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**
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** Each integer array is initially empty. New arrays can be bound to
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** an integer array as follows:
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**
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** sqlite3_int64 a1[] = { 1, 2, 3, 4 };
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** sqlite3_int64 a2[] = { 5, 6, 7, 8, 9, 10, 11 };
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** sqlite3_int64 *a3 = sqlite3_malloc( 100*sizeof(sqlite3_int64) );
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** // Fill in content of a3[]
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** sqlite3_intarray_bind(p1, 4, a1, 0);
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** sqlite3_intarray_bind(p2, 7, a2, 0);
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** sqlite3_intarray_bind(p3, 100, a3, sqlite3_free);
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**
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** A single intarray object can be rebound multiple times. But do not
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** attempt to change the bindings of an intarray while it is in the middle
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** of a query.
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**
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** The array that holds the integers is automatically freed by the function
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** in the fourth parameter to sqlite3_intarray_bind() when the array is no
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** longer needed. The application must not change the intarray values
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** while an intarray is in the middle of a query.
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**
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** The intarray object is automatically destroyed when its corresponding
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** virtual table is dropped. Since the virtual tables are created in the
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** TEMP database, they are automatically dropped when the database connection
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** closes so the application does not normally need to take any special
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** action to free the intarray objects.
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*/
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#include "sqlite3.h"
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#ifndef _INTARRAY_H_
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#define _INTARRAY_H_
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/*
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** Make sure we can call this stuff from C++.
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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** An sqlite3_intarray is an abstract type to stores an instance of
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** an integer array.
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*/
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typedef struct sqlite3_intarray sqlite3_intarray;
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/*
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** Invoke this routine to create a specific instance of an intarray object.
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** The new intarray object is returned by the 3rd parameter.
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**
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** Each intarray object corresponds to a virtual table in the TEMP table
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** with a name of zName.
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**
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** Destroy the intarray object by dropping the virtual table. If not done
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** explicitly by the application, the virtual table will be dropped implicitly
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** by the system when the database connection is closed.
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*/
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int sqlite3_intarray_create(
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sqlite3 *db,
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const char *zName,
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sqlite3_intarray **ppReturn
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);
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/*
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** Bind a new array array of integers to a specific intarray object.
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**
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** The array of integers bound must be unchanged for the duration of
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** any query against the corresponding virtual table. If the integer
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** array does change or is deallocated undefined behavior will result.
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*/
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int sqlite3_intarray_bind(
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sqlite3_intarray *pIntArray, /* The intarray object to bind to */
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int nElements, /* Number of elements in the intarray */
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sqlite3_int64 *aElements, /* Content of the intarray */
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void (*xFree)(void*) /* How to dispose of the intarray when done */
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);
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#ifdef __cplusplus
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} /* End of the 'extern "C"' block */
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#endif
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#endif /* _INTARRAY_H_ */
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