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mattercontrol/Community.CsharpSqlite/src/vdbeapi_c.cs
Lars Brubaker 591528ee91 Ran code maid against this code.
2015-04-08 15:20:10 -07:00

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using System;
using System.Diagnostics;
using System.Text;
using i64 = System.Int64;
using sqlite3_int64 = System.Int64;
using u16 = System.UInt16;
using u32 = System.UInt32;
using u8 = System.Byte;
namespace Community.CsharpSqlite
{
using sqlite_int64 = System.Int64;
using sqlite3_stmt = Sqlite3.Vdbe;
using sqlite3_value = Sqlite3.Mem;
public partial class Sqlite3
{
/*
** 2004 May 26
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
**
** This file contains code use to implement APIs that are part of the
** VDBE.
*************************************************************************
** Included in SQLite3 port to C#-SQLite; 2008 Noah B Hart
** C#-SQLite is an independent reimplementation of the SQLite software library
**
** SQLITE_SOURCE_ID: 2011-06-23 19:49:22 4374b7e83ea0a3fbc3691f9c0c936272862f32f2
**
*************************************************************************
*/
//#include "sqliteInt.h"
//#include "vdbeInt.h"
#if !SQLITE_OMIT_DEPRECATED
/*
** Return TRUE (non-zero) of the statement supplied as an argument needs
** to be recompiled. A statement needs to be recompiled whenever the
** execution environment changes in a way that would alter the program
** that sqlite3_prepare() generates. For example, if new functions or
** collating sequences are registered or if an authorizer function is
** added or changed.
*/
static int sqlite3_expired( sqlite3_stmt pStmt )
{
Vdbe p = (Vdbe)pStmt;
return ( p == null || p.expired ) ? 1 : 0;
}
#endif
/*
** Check on a Vdbe to make sure it has not been finalized. Log
** an error and return true if it has been finalized (or is otherwise
** invalid). Return false if it is ok.
*/
private static bool vdbeSafety(Vdbe p)
{
if (p.db == null)
{
sqlite3_log(SQLITE_MISUSE, "API called with finalized prepared statement");
return true;
}
else
{
return false;
}
}
private static bool vdbeSafetyNotNull(Vdbe p)
{
if (p == null)
{
sqlite3_log(SQLITE_MISUSE, "API called with NULL prepared statement");
return true;
}
else
{
return vdbeSafety(p);
}
}
/*
** The following routine destroys a virtual machine that is created by
** the sqlite3_compile() routine. The integer returned is an SQLITE_
** success/failure code that describes the result of executing the virtual
** machine.
**
** This routine sets the error code and string returned by
** sqlite3_errcode(), sqlite3_errmsg() and sqlite3_errmsg16().
*/
public static int sqlite3_finalize(sqlite3_stmt pStmt)
{
int rc;
if (pStmt == null)
{
/* IMPLEMENTATION-OF: R-57228-12904 Invoking sqlite3_finalize() on a NULL
** pointer is a harmless no-op. */
rc = SQLITE_OK;
}
else
{
Vdbe v = pStmt;
sqlite3 db = v.db;
#if SQLITE_THREADSAFE
sqlite3_mutex mutex;
#endif
if (vdbeSafety(v))
return SQLITE_MISUSE_BKPT();
#if SQLITE_THREADSAFE
mutex = v.db.mutex;
#endif
sqlite3_mutex_enter(mutex);
rc = sqlite3VdbeFinalize(ref v);
rc = sqlite3ApiExit(db, rc);
sqlite3_mutex_leave(mutex);
}
return rc;
}
/*
** Terminate the current execution of an SQL statement and reset it
** back to its starting state so that it can be reused. A success code from
** the prior execution is returned.
**
** This routine sets the error code and string returned by
** sqlite3_errcode(), sqlite3_errmsg() and sqlite3_errmsg16().
*/
public static int sqlite3_reset(sqlite3_stmt pStmt)
{
int rc;
if (pStmt == null)
{
rc = SQLITE_OK;
}
else
{
Vdbe v = (Vdbe)pStmt;
sqlite3_mutex_enter(v.db.mutex);
rc = sqlite3VdbeReset(v);
sqlite3VdbeRewind(v);
Debug.Assert((rc & (v.db.errMask)) == rc);
rc = sqlite3ApiExit(v.db, rc);
sqlite3_mutex_leave(v.db.mutex);
}
return rc;
}
/*
** Set all the parameters in the compiled SQL statement to NULL.
*/
public static int sqlite3_clear_bindings(sqlite3_stmt pStmt)
{
int i;
int rc = SQLITE_OK;
Vdbe p = (Vdbe)pStmt;
#if SQLITE_THREADSAFE
sqlite3_mutex mutex = ((Vdbe)pStmt).db.mutex;
#endif
sqlite3_mutex_enter(mutex);
for (i = 0; i < p.nVar; i++)
{
sqlite3VdbeMemRelease(p.aVar[i]);
p.aVar[i].flags = MEM_Null;
}
if (p.isPrepareV2 && p.expmask != 0)
{
p.expired = true;
}
sqlite3_mutex_leave(mutex);
return rc;
}
/**************************** sqlite3_value_ *******************************
** The following routines extract information from a Mem or sqlite3_value
** structure.
*/
public static byte[] sqlite3_value_blob(sqlite3_value pVal)
{
Mem p = pVal;
if ((p.flags & (MEM_Blob | MEM_Str)) != 0)
{
sqlite3VdbeMemExpandBlob(p);
if (p.zBLOB == null && p.z != null)
{
if (p.z.Length == 0)
p.zBLOB = sqlite3Malloc(1);
else
{
p.zBLOB = sqlite3Malloc(p.z.Length);
Debug.Assert(p.zBLOB.Length == p.z.Length);
for (int i = 0; i < p.zBLOB.Length; i++)
p.zBLOB[i] = (u8)p.z[i];
}
p.z = null;
}
p.flags = (u16)(p.flags & ~MEM_Str);
p.flags |= MEM_Blob;
return p.n > 0 ? p.zBLOB : null;
}
else
{
return sqlite3_value_text(pVal) == null ? null : Encoding.UTF8.GetBytes(sqlite3_value_text(pVal));
}
}
public static int sqlite3_value_bytes(sqlite3_value pVal)
{
return sqlite3ValueBytes(pVal, SQLITE_UTF8);
}
public static int sqlite3_value_bytes16(sqlite3_value pVal)
{
return sqlite3ValueBytes(pVal, SQLITE_UTF16NATIVE);
}
public static double sqlite3_value_double(sqlite3_value pVal)
{
return sqlite3VdbeRealValue(pVal);
}
public static int sqlite3_value_int(sqlite3_value pVal)
{
return (int)sqlite3VdbeIntValue(pVal);
}
public static sqlite_int64 sqlite3_value_int64(sqlite3_value pVal)
{
return sqlite3VdbeIntValue(pVal);
}
public static string sqlite3_value_text(sqlite3_value pVal)
{
return sqlite3ValueText(pVal, SQLITE_UTF8);
}
#if !SQLITE_OMIT_UTF16
public static string sqlite3_value_text16(sqlite3_value pVal){
return sqlite3ValueText(pVal, SQLITE_UTF16NATIVE);
}
public static string sqlite3_value_text16be(sqlite3_value pVal){
return sqlite3ValueText(pVal, SQLITE_UTF16BE);
}
public static string sqlite3_value_text16le(sqlite3_value pVal){
return sqlite3ValueText(pVal, SQLITE_UTF16LE);
}
#endif // * SQLITE_OMIT_UTF16 */
public static int sqlite3_value_type(sqlite3_value pval)
{
return pval.type;
}
/**************************** sqlite3_result_ *******************************
** The following routines are used by user-defined functions to specify
** the function result.
**
** The setStrOrError() funtion calls sqlite3VdbeMemSetStr() to store the
** result as a string or blob but if the string or blob is too large, it
** then sets the error code to SQLITE_TOOBIG
*/
private static void setResultStrOrError(
sqlite3_context pCtx, /* Function context */
string z, /* String pointer */
int o, /* offset into string */
int n, /* Bytes in string, or negative */
u8 enc, /* Encoding of z. 0 for BLOBs */
dxDel xDel //void (*xDel)(void) /* Destructor function */
)
{
if (sqlite3VdbeMemSetStr(pCtx.s, z, o, n, enc, xDel) == SQLITE_TOOBIG)
{
sqlite3_result_error_toobig(pCtx);
}
}
private static void setResultStrOrError(
sqlite3_context pCtx, /* Function context */
string z, /* String pointer */
int n, /* Bytes in string, or negative */
u8 enc, /* Encoding of z. 0 for BLOBs */
dxDel xDel //void (*xDel)(void) /* Destructor function */
)
{
if (sqlite3VdbeMemSetStr(pCtx.s, z, n, enc, xDel) == SQLITE_TOOBIG)
{
sqlite3_result_error_toobig(pCtx);
}
}
public static void sqlite3_result_blob(
sqlite3_context pCtx,
string z,
int n,
dxDel xDel
)
{
Debug.Assert(n >= 0);
Debug.Assert(sqlite3_mutex_held(pCtx.s.db.mutex));
setResultStrOrError(pCtx, z, n, 0, xDel);
}
public static void sqlite3_result_double(sqlite3_context pCtx, double rVal)
{
Debug.Assert(sqlite3_mutex_held(pCtx.s.db.mutex));
sqlite3VdbeMemSetDouble(pCtx.s, rVal);
}
public static void sqlite3_result_error(sqlite3_context pCtx, string z, int n)
{
Debug.Assert(sqlite3_mutex_held(pCtx.s.db.mutex));
setResultStrOrError(pCtx, z, n, SQLITE_UTF8, SQLITE_TRANSIENT);
pCtx.isError = SQLITE_ERROR;
}
#if !SQLITE_OMIT_UTF16
//void sqlite3_result_error16(sqlite3_context pCtx, string z, int n){
// Debug.Assert( sqlite3_mutex_held(pCtx.s.db.mutex) );
// pCtx.isError = SQLITE_ERROR;
// sqlite3VdbeMemSetStr(pCtx.s, z, n, SQLITE_UTF16NATIVE, SQLITE_TRANSIENT);
//}
#endif
public static void sqlite3_result_int(sqlite3_context pCtx, int iVal)
{
Debug.Assert(sqlite3_mutex_held(pCtx.s.db.mutex));
sqlite3VdbeMemSetInt64(pCtx.s, (i64)iVal);
}
public static void sqlite3_result_int64(sqlite3_context pCtx, i64 iVal)
{
Debug.Assert(sqlite3_mutex_held(pCtx.s.db.mutex));
sqlite3VdbeMemSetInt64(pCtx.s, iVal);
}
public static void sqlite3_result_null(sqlite3_context pCtx)
{
Debug.Assert(sqlite3_mutex_held(pCtx.s.db.mutex));
sqlite3VdbeMemSetNull(pCtx.s);
}
public static void sqlite3_result_text(
sqlite3_context pCtx,
string z,
int o, //Offset
int n,
dxDel xDel
)
{
Debug.Assert(sqlite3_mutex_held(pCtx.s.db.mutex));
setResultStrOrError(pCtx, z, o, n, SQLITE_UTF8, xDel);
}
public static void sqlite3_result_text(
sqlite3_context pCtx,
StringBuilder z,
int n,
dxDel xDel
)
{
Debug.Assert(sqlite3_mutex_held(pCtx.s.db.mutex));
setResultStrOrError(pCtx, z.ToString(), n, SQLITE_UTF8, xDel);
}
public static void sqlite3_result_text(
sqlite3_context pCtx,
string z,
int n,
dxDel xDel
)
{
Debug.Assert(sqlite3_mutex_held(pCtx.s.db.mutex));
setResultStrOrError(pCtx, z, n, SQLITE_UTF8, xDel);
}
#if !SQLITE_OMIT_UTF16
void sqlite3_result_text16(
sqlite3_context pCtx,
string z,
int n,
dxDel xDel
){
Debug.Assert( sqlite3_mutex_held(pCtx.s.db.mutex) );
sqlite3VdbeMemSetStr(pCtx.s, z, n, SQLITE_UTF16NATIVE, xDel);
}
void sqlite3_result_text16be(
sqlite3_context pCtx,
string z,
int n,
dxDel xDel
){
Debug.Assert( sqlite3_mutex_held(pCtx.s.db.mutex) );
sqlite3VdbeMemSetStr(pCtx.s, z, n, SQLITE_UTF16BE, xDel);
}
void sqlite3_result_text16le(
sqlite3_context pCtx,
string z,
int n,
dxDel xDel
){
Debug.Assert( sqlite3_mutex_held(pCtx.s.db.mutex) );
sqlite3VdbeMemSetStr(pCtx.s, z, n, SQLITE_UTF16LE, xDel);
}
#endif // * SQLITE_OMIT_UTF16 */
public static void sqlite3_result_value(sqlite3_context pCtx, sqlite3_value pValue)
{
Debug.Assert(sqlite3_mutex_held(pCtx.s.db.mutex));
sqlite3VdbeMemCopy(pCtx.s, pValue);
}
public static void sqlite3_result_zeroblob(sqlite3_context pCtx, int n)
{
Debug.Assert(sqlite3_mutex_held(pCtx.s.db.mutex));
sqlite3VdbeMemSetZeroBlob(pCtx.s, n);
}
public static void sqlite3_result_error_code(sqlite3_context pCtx, int errCode)
{
pCtx.isError = errCode;
if ((pCtx.s.flags & MEM_Null) != 0)
{
setResultStrOrError(pCtx, sqlite3ErrStr(errCode), -1,
SQLITE_UTF8, SQLITE_STATIC);
}
}
/* Force an SQLITE_TOOBIG error. */
public static void sqlite3_result_error_toobig(sqlite3_context pCtx)
{
Debug.Assert(sqlite3_mutex_held(pCtx.s.db.mutex));
pCtx.isError = SQLITE_ERROR;
setResultStrOrError(pCtx, "string or blob too big", -1,
SQLITE_UTF8, SQLITE_STATIC);
}
/* An SQLITE_NOMEM error. */
public static void sqlite3_result_error_nomem(sqlite3_context pCtx)
{
Debug.Assert(sqlite3_mutex_held(pCtx.s.db.mutex));
sqlite3VdbeMemSetNull(pCtx.s);
pCtx.isError = SQLITE_NOMEM;
//pCtx.s.db.mallocFailed = 1;
}
/*
** This function is called after a transaction has been committed. It
** invokes callbacks registered with sqlite3_wal_hook() as required.
*/
private static int doWalCallbacks(sqlite3 db)
{
int rc = SQLITE_OK;
#if !SQLITE_OMIT_WAL
int i;
for(i=0; i<db->nDb; i++){
Btree *pBt = db->aDb[i].pBt;
if( pBt ){
int nEntry = sqlite3PagerWalCallback(sqlite3BtreePager(pBt));
if( db->xWalCallback && nEntry>0 && rc==SQLITE_OK ){
rc = db->xWalCallback(db->pWalArg, db, db->aDb[i].zName, nEntry);
}
}
}
#endif
return rc;
}
/*
** Execute the statement pStmt, either until a row of data is ready, the
** statement is completely executed or an error occurs.
**
** This routine implements the bulk of the logic behind the sqlite_step()
** API. The only thing omitted is the automatic recompile if a
** schema change has occurred. That detail is handled by the
** outer sqlite3_step() wrapper procedure.
*/
private static int sqlite3Step(Vdbe p)
{
sqlite3 db;
int rc;
Debug.Assert(p != null);
if (p.magic != VDBE_MAGIC_RUN)
{
/* We used to require that sqlite3_reset() be called before retrying
** sqlite3_step() after any error or after SQLITE_DONE. But beginning
** with version 3.7.0, we changed this so that sqlite3_reset() would
** be called automatically instead of throwing the SQLITE_MISUSE error.
** This "automatic-reset" change is not technically an incompatibility,
** since any application that receives an SQLITE_MISUSE is broken by
** definition.
**
** Nevertheless, some published applications that were originally written
** for version 3.6.23 or earlier do in fact depend on SQLITE_MISUSE
** returns, and the so were broken by the automatic-reset change. As a
** a work-around, the SQLITE_OMIT_AUTORESET compile-time restores the
** legacy behavior of returning SQLITE_MISUSE for cases where the
** previous sqlite3_step() returned something other than a SQLITE_LOCKED
** or SQLITE_BUSY error.
*/
#if SQLITE_OMIT_AUTORESET
if( p.rc==SQLITE_BUSY || p.rc==SQLITE_LOCKED ){
sqlite3_reset((sqlite3_stmt)p);
}else{
return SQLITE_MISUSE_BKPT();
}
#else
sqlite3_reset((sqlite3_stmt)p);
#endif
}
/* Check that malloc() has not failed. If it has, return early. */
db = p.db;
//if ( db.mallocFailed != 0 )
//{
//p->rc = SQLITE_NOMEM;
// return SQLITE_NOMEM;
//}
if (p.pc <= 0 && p.expired)
{
p.rc = SQLITE_SCHEMA;
rc = SQLITE_ERROR;
goto end_of_step;
}
if (p.pc < 0)
{
/* If there are no other statements currently running, then
** reset the interrupt flag. This prevents a call to sqlite3_interrupt
** from interrupting a statement that has not yet started.
*/
if (db.activeVdbeCnt == 0)
{
db.u1.isInterrupted = false;
}
Debug.Assert(db.writeVdbeCnt > 0 || db.autoCommit == 0 || db.nDeferredCons == 0);
#if !SQLITE_OMIT_TRACE
if (db.xProfile != null && 0 == db.init.busy)
{
sqlite3OsCurrentTimeInt64(db.pVfs, ref p.startTime);
}
#endif
db.activeVdbeCnt++;
if (p.readOnly == false)
db.writeVdbeCnt++;
p.pc = 0;
}
#if !SQLITE_OMIT_EXPLAIN
if (p.explain != 0)
{
rc = sqlite3VdbeList(p);
}
else
#endif // * SQLITE_OMIT_EXPLAIN */
{
db.vdbeExecCnt++;
rc = sqlite3VdbeExec(p);
db.vdbeExecCnt--;
}
#if !SQLITE_OMIT_TRACE
/* Invoke the profile callback if there is one
*/
if (rc != SQLITE_ROW && db.xProfile != null && 0 == db.init.busy && p.zSql != null)
{
sqlite3_int64 iNow = 0;
sqlite3OsCurrentTimeInt64(db.pVfs, ref iNow);
db.xProfile(db.pProfileArg, p.zSql, (iNow - p.startTime) * 1000000);
}
#endif
if (rc == SQLITE_DONE)
{
Debug.Assert(p.rc == SQLITE_OK);
p.rc = doWalCallbacks(db);
if (p.rc != SQLITE_OK)
{
rc = SQLITE_ERROR;
}
}
db.errCode = rc;
if (SQLITE_NOMEM == sqlite3ApiExit(p.db, p.rc))
{
p.rc = SQLITE_NOMEM;
}
end_of_step:
/* At this point local variable rc holds the value that should be
** returned if this statement was compiled using the legacy
** sqlite3_prepare() interface. According to the docs, this can only
** be one of the values in the first Debug.Assert() below. Variable p.rc
** contains the value that would be returned if sqlite3_finalize()
** were called on statement p.
*/
Debug.Assert(rc == SQLITE_ROW || rc == SQLITE_DONE || rc == SQLITE_ERROR
|| rc == SQLITE_BUSY || rc == SQLITE_MISUSE
);
Debug.Assert(p.rc != SQLITE_ROW && p.rc != SQLITE_DONE);
if (p.isPrepareV2 && rc != SQLITE_ROW && rc != SQLITE_DONE)
{
/* If this statement was prepared using sqlite3_prepare_v2(), and an
** error has occured, then return the error code in p.rc to the
** caller. Set the error code in the database handle to the same value.
*/
rc = db.errCode = p.rc;
}
return (rc & db.errMask);
}
/*
** The maximum number of times that a statement will try to reparse
** itself before giving up and returning SQLITE_SCHEMA.
*/
#if !SQLITE_MAX_SCHEMA_RETRY
//# define SQLITE_MAX_SCHEMA_RETRY 5
public const int SQLITE_MAX_SCHEMA_RETRY = 5;
#endif
/*
** This is the top-level implementation of sqlite3_step(). Call
** sqlite3Step() to do most of the work. If a schema error occurs,
** call sqlite3Reprepare() and try again.
*/
public static int sqlite3_step(sqlite3_stmt pStmt)
{
int rc = SQLITE_OK; /* Result from sqlite3Step() */
int rc2 = SQLITE_OK; /* Result from sqlite3Reprepare() */
Vdbe v = (Vdbe)pStmt; /* the prepared statement */
int cnt = 0; /* Counter to prevent infinite loop of reprepares */
sqlite3 db; /* The database connection */
if (vdbeSafetyNotNull(v))
{
return SQLITE_MISUSE_BKPT();
}
db = v.db;
sqlite3_mutex_enter(db.mutex);
while ((rc = sqlite3Step(v)) == SQLITE_SCHEMA
&& cnt++ < SQLITE_MAX_SCHEMA_RETRY
&& (rc2 = rc = sqlite3Reprepare(v)) == SQLITE_OK)
{
sqlite3_reset(pStmt);
v.expired = false;
}
if (rc2 != SQLITE_OK && ALWAYS(v.isPrepareV2) && ALWAYS(db.pErr != null))
{
/* This case occurs after failing to recompile an sql statement.
** The error message from the SQL compiler has already been loaded
** into the database handle. This block copies the error message
** from the database handle into the statement and sets the statement
** program counter to 0 to ensure that when the statement is
** finalized or reset the parser error message is available via
** sqlite3_errmsg() and sqlite3_errcode().
*/
string zErr = sqlite3_value_text(db.pErr);
sqlite3DbFree(db, ref v.zErrMsg);
//if ( 0 == db.mallocFailed )
{
v.zErrMsg = zErr;// sqlite3DbStrDup(db, zErr);
v.rc = rc2;
}
//else
//{
// v.zErrMsg = "";
// v->rc = rc = SQLITE_NOMEM;
//}
}
rc = sqlite3ApiExit(db, rc);
sqlite3_mutex_leave(db.mutex);
return rc;
}
/*
** Extract the user data from a sqlite3_context structure and return a
** pointer to it.
**
** IMPLEMENTATION-OF: R-46798-50301 The sqlite3_context_db_handle() interface
** returns a copy of the pointer to the database connection (the 1st
** parameter) of the sqlite3_create_function() and
** sqlite3_create_function16() routines that originally registered the
** application defined function.
*/
public static object sqlite3_user_data(sqlite3_context p)
{
Debug.Assert(p != null && p.pFunc != null);
return p.pFunc.pUserData;
}
/*
** Extract the user data from a sqlite3_context structure and return a
** pointer to it.
*/
public static sqlite3 sqlite3_context_db_handle(sqlite3_context p)
{
Debug.Assert(p != null && p.pFunc != null);
return p.s.db;
}
/*
** The following is the implementation of an SQL function that always
** fails with an error message stating that the function is used in the
** wrong context. The sqlite3_overload_function() API might construct
** SQL function that use this routine so that the functions will exist
** for name resolution but are actually overloaded by the xFindFunction
** method of virtual tables.
*/
public static void sqlite3InvalidFunction(
sqlite3_context context, /* The function calling context */
int NotUsed, /* Number of arguments to the function */
sqlite3_value[] NotUsed2 /* Value of each argument */
)
{
string zName = context.pFunc.zName;
string zErr;
UNUSED_PARAMETER2(NotUsed, NotUsed2);
zErr = sqlite3_mprintf(
"unable to use function %s in the requested context", zName);
sqlite3_result_error(context, zErr, -1);
//sqlite3_free( ref zErr );
}
/*
** Allocate or return the aggregate context for a user function. A new
** context is allocated on the first call. Subsequent calls return the
** same context that was returned on prior calls.
*/
public static Mem sqlite3_aggregate_context(sqlite3_context p, int nByte)
{
Mem pMem;
Debug.Assert(p != null && p.pFunc != null && p.pFunc.xStep != null);
Debug.Assert(sqlite3_mutex_held(p.s.db.mutex));
pMem = p.pMem;
testcase(nByte < 0);
if ((pMem.flags & MEM_Agg) == 0)
{
if (nByte <= 0)
{
sqlite3VdbeMemReleaseExternal(pMem);
pMem.flags = 0;
pMem.z = null;
}
else
{
sqlite3VdbeMemGrow(pMem, nByte, 0);
pMem.flags = MEM_Agg;
pMem.u.pDef = p.pFunc;
if (pMem.z != null)
{
pMem.z = null;
}
pMem._Mem = sqlite3Malloc(pMem._Mem);
pMem._Mem.flags = 0;
pMem._Mem.z = null;
}
}
return pMem._Mem;
}
/*
** Return the auxillary data pointer, if any, for the iArg'th argument to
** the user-function defined by pCtx.
*/
public static object sqlite3_get_auxdata(sqlite3_context pCtx, int iArg)
{
VdbeFunc pVdbeFunc;
Debug.Assert(sqlite3_mutex_held(pCtx.s.db.mutex));
pVdbeFunc = pCtx.pVdbeFunc;
if (null == pVdbeFunc || iArg >= pVdbeFunc.nAux || iArg < 0)
{
return null;
}
return pVdbeFunc.apAux[iArg].pAux;
}
/*
** Set the auxillary data pointer and delete function, for the iArg'th
** argument to the user-function defined by pCtx. Any previous value is
** deleted by calling the delete function specified when it was set.
*/
public static void sqlite3_set_auxdata(
sqlite3_context pCtx,
int iArg,
object pAux
//void (*xDelete)(void)
)
{
AuxData pAuxData;
VdbeFunc pVdbeFunc;
if (iArg < 0)
goto failed;
Debug.Assert(sqlite3_mutex_held(pCtx.s.db.mutex));
pVdbeFunc = pCtx.pVdbeFunc;
if (null == pVdbeFunc || pVdbeFunc.nAux <= iArg)
{
int nAux = (pVdbeFunc != null ? pVdbeFunc.nAux : 0);
////int nMalloc = iArg;
////VdbeFunc+ sizeof(struct AuxData)*iArg;
if (pVdbeFunc == null)
{
//pVdbeFunc = (VdbeFunc)sqlite3DbRealloc( pCtx.s.db, pVdbeFunc, nMalloc );
pVdbeFunc = new VdbeFunc();
if (null == pVdbeFunc)
{
goto failed;
}
pCtx.pVdbeFunc = pVdbeFunc;
}
pVdbeFunc.apAux[nAux] = new AuxData();//memset(pVdbeFunc.apAux[nAux], 0, sizeof(struct AuxData)*(iArg+1-nAux));
pVdbeFunc.nAux = iArg + 1;
pVdbeFunc.pFunc = pCtx.pFunc;
}
pAuxData = pVdbeFunc.apAux[iArg];
if (pAuxData.pAux != null && pAuxData.pAux is IDisposable)
{
(pAuxData.pAux as IDisposable).Dispose();
}
pAuxData.pAux = pAux;
return;
failed:
if (pAux != null && pAux is IDisposable)
{
(pAux as IDisposable).Dispose();
}
}
#if !SQLITE_OMIT_DEPRECATED
/*
** Return the number of times the Step function of a aggregate has been
** called.
**
** This function is deprecated. Do not use it for new code. It is
** provide only to avoid breaking legacy code. New aggregate function
** implementations should keep their own counts within their aggregate
** context.
*/
static int sqlite3_aggregate_count( sqlite3_context p )
{
Debug.Assert( p != null && p.pMem != null && p.pFunc != null && p.pFunc.xStep != null );
return p.pMem.n;
}
#endif
/*
** Return the number of columns in the result set for the statement pStmt.
*/
public static int sqlite3_column_count(sqlite3_stmt pStmt)
{
Vdbe pVm = pStmt;
return pVm != null ? (int)pVm.nResColumn : 0;
}
/*
** Return the number of values available from the current row of the
** currently executing statement pStmt.
*/
public static int sqlite3_data_count(sqlite3_stmt pStmt)
{
Vdbe pVm = pStmt;
if (pVm == null || pVm.pResultSet == null)
return 0;
return pVm.nResColumn;
}
/*
** Check to see if column iCol of the given statement is valid. If
** it is, return a pointer to the Mem for the value of that column.
** If iCol is not valid, return a pointer to a Mem which has a value
** of NULL.
*/
private static Mem columnMem(sqlite3_stmt pStmt, int i)
{
Vdbe pVm;
Mem pOut;
pVm = (Vdbe)pStmt;
if (pVm != null && pVm.pResultSet != null && i < pVm.nResColumn && i >= 0)
{
sqlite3_mutex_enter(pVm.db.mutex);
pOut = pVm.pResultSet[i];
}
else
{
/* If the value passed as the second argument is out of range, return
** a pointer to the following public static Mem object which contains the
** value SQL NULL. Even though the Mem structure contains an element
** of type i64, on certain architecture (x86) with certain compiler
** switches (-Os), gcc may align this Mem object on a 4-byte boundary
** instead of an 8-byte one. This all works fine, except that when
** running with SQLITE_DEBUG defined the SQLite code sometimes Debug.Assert()s
** that a Mem structure is located on an 8-byte boundary. To prevent
** this Debug.Assert() from failing, when building with SQLITE_DEBUG defined
** using gcc, force nullMem to be 8-byte aligned using the magical
** __attribute__((aligned(8))) macro. */
// static const Mem nullMem
//#if defined(SQLITE_DEBUG) && defined(__GNUC__)
// __attribute__((aligned(8)))
//#endif
// = {0, "", (double)0, {0}, 0, MEM_Null, SQLITE_NULL, 0,
//#if SQLITE_DEBUG
// 0, 0, /* pScopyFrom, pFiller */
//#endif
// 0, 0 };
Mem nullMem = new Mem(null, "", (double)0, 0, 0, MEM_Null, SQLITE_NULL, 0
#if SQLITE_DEBUG
, null, null /* pScopyFrom, pFiller */
#endif
);
if (pVm != null && ALWAYS(pVm.db != null))
{
sqlite3_mutex_enter(pVm.db.mutex);
sqlite3Error(pVm.db, SQLITE_RANGE, 0);
}
pOut = nullMem;
}
return pOut;
}
/*
** This function is called after invoking an sqlite3_value_XXX function on a
** column value (i.e. a value returned by evaluating an SQL expression in the
** select list of a SELECT statement) that may cause a malloc() failure. If
** malloc() has failed, the threads mallocFailed flag is cleared and the result
** code of statement pStmt set to SQLITE_NOMEM.
**
** Specifically, this is called from within:
**
** sqlite3_column_int()
** sqlite3_column_int64()
** sqlite3_column_text()
** sqlite3_column_text16()
** sqlite3_column_real()
** sqlite3_column_bytes()
** sqlite3_column_bytes16()
** sqlite3_column_blob()
*/
private static void columnMallocFailure(sqlite3_stmt pStmt)
{
/* If malloc() failed during an encoding conversion within an
** sqlite3_column_XXX API, then set the return code of the statement to
** SQLITE_NOMEM. The next call to _step() (if any) will return SQLITE_ERROR
** and _finalize() will return NOMEM.
*/
Vdbe p = pStmt;
if (p != null)
{
p.rc = sqlite3ApiExit(p.db, p.rc);
sqlite3_mutex_leave(p.db.mutex);
}
}
/**************************** sqlite3_column_ *******************************
** The following routines are used to access elements of the current row
** in the result set.
*/
public static byte[] sqlite3_column_blob(sqlite3_stmt pStmt, int i)
{
byte[] val;
val = sqlite3_value_blob(columnMem(pStmt, i));
/* Even though there is no encoding conversion, value_blob() might
** need to call malloc() to expand the result of a zeroblob()
** expression.
*/
columnMallocFailure(pStmt);
return val;
}
public static int sqlite3_column_bytes(sqlite3_stmt pStmt, int i)
{
int val = sqlite3_value_bytes(columnMem(pStmt, i));
columnMallocFailure(pStmt);
return val;
}
public static int sqlite3_column_bytes16(sqlite3_stmt pStmt, int i)
{
int val = sqlite3_value_bytes16(columnMem(pStmt, i));
columnMallocFailure(pStmt);
return val;
}
public static double sqlite3_column_double(sqlite3_stmt pStmt, int i)
{
double val = sqlite3_value_double(columnMem(pStmt, i));
columnMallocFailure(pStmt);
return val;
}
public static int sqlite3_column_int(sqlite3_stmt pStmt, int i)
{
int val = sqlite3_value_int(columnMem(pStmt, i));
columnMallocFailure(pStmt);
return val;
}
public static sqlite_int64 sqlite3_column_int64(sqlite3_stmt pStmt, int i)
{
sqlite_int64 val = sqlite3_value_int64(columnMem(pStmt, i));
columnMallocFailure(pStmt);
return val;
}
public static string sqlite3_column_text(sqlite3_stmt pStmt, int i)
{
string val = sqlite3_value_text(columnMem(pStmt, i));
columnMallocFailure(pStmt);
return val;
}
public static sqlite3_value sqlite3_column_value(sqlite3_stmt pStmt, int i)
{
Mem pOut = columnMem(pStmt, i);
if ((pOut.flags & MEM_Static) != 0)
{
pOut.flags = (u16)(pOut.flags & ~MEM_Static);
pOut.flags |= MEM_Ephem;
}
columnMallocFailure(pStmt);
return (sqlite3_value)pOut;
}
#if !SQLITE_OMIT_UTF16
//const void *sqlite3_column_text16(sqlite3_stmt pStmt, int i){
// const void *val = sqlite3_value_text16( columnMem(pStmt,i) );
// columnMallocFailure(pStmt);
// return val;
//}
#endif // * SQLITE_OMIT_UTF16 */
public static int sqlite3_column_type(sqlite3_stmt pStmt, int i)
{
int iType = sqlite3_value_type(columnMem(pStmt, i));
columnMallocFailure(pStmt);
return iType;
}
/* The following function is experimental and subject to change or
** removal */
/*int sqlite3_column_numeric_type(sqlite3_stmt pStmt, int i){
** return sqlite3_value_numeric_type( columnMem(pStmt,i) );
**}
*/
/*
** Convert the N-th element of pStmt.pColName[] into a string using
** xFunc() then return that string. If N is out of range, return 0.
**
** There are up to 5 names for each column. useType determines which
** name is returned. Here are the names:
**
** 0 The column name as it should be displayed for output
** 1 The datatype name for the column
** 2 The name of the database that the column derives from
** 3 The name of the table that the column derives from
** 4 The name of the table column that the result column derives from
**
** If the result is not a simple column reference (if it is an expression
** or a constant) then useTypes 2, 3, and 4 return NULL.
*/
public static string columnName(
sqlite3_stmt pStmt,
int N,
dxColname xFunc,
int useType
)
{
string ret = null;
Vdbe p = pStmt;
int n;
sqlite3 db = p.db;
Debug.Assert(db != null);
n = sqlite3_column_count(pStmt);
if (N < n && N >= 0)
{
N += useType * n;
sqlite3_mutex_enter(db.mutex);
//Debug.Assert( db.mallocFailed == 0 );
ret = xFunc(p.aColName[N]);
/* A malloc may have failed inside of the xFunc() call. If this
** is the case, clear the mallocFailed flag and return NULL.
*/
//if ( db.mallocFailed != 0 )
//{
// //db.mallocFailed = 0;
// ret = null;
//}
sqlite3_mutex_leave(db.mutex);
}
return ret;
}
/*
** Return the name of the Nth column of the result set returned by SQL
** statement pStmt.
*/
public static string sqlite3_column_name(sqlite3_stmt pStmt, int N)
{
return columnName(
pStmt, N, sqlite3_value_text, COLNAME_NAME);
}
#if !SQLITE_OMIT_UTF16
public static string sqlite3_column_name16(sqlite3_stmt pStmt, int N){
return columnName(
pStmt, N, sqlite3_value_text16, COLNAME_NAME);
}
#endif
/*
** Constraint: If you have ENABLE_COLUMN_METADATA then you must
** not define OMIT_DECLTYPE.
*/
#if SQLITE_OMIT_DECLTYPE && SQLITE_ENABLE_COLUMN_METADATA
# error "Must not define both SQLITE_OMIT_DECLTYPE and SQLITE_ENABLE_COLUMN_METADATA"
#endif
#if !SQLITE_OMIT_DECLTYPE
/*
** Return the column declaration type (if applicable) of the 'i'th column
** of the result set of SQL statement pStmt.
*/
public static string sqlite3_column_decltype(sqlite3_stmt pStmt, int N)
{
return columnName(
pStmt, N, sqlite3_value_text, COLNAME_DECLTYPE);
}
#if !SQLITE_OMIT_UTF16
//const void *sqlite3_column_decltype16(sqlite3_stmt pStmt, int N){
// return columnName(
// pStmt, N, (const void*()(Mem))sqlite3_value_text16, COLNAME_DECLTYPE);
//}
#endif // * SQLITE_OMIT_UTF16 */
#endif // * SQLITE_OMIT_DECLTYPE */
#if SQLITE_ENABLE_COLUMN_METADATA
/*
** Return the name of the database from which a result column derives.
** NULL is returned if the result column is an expression or constant or
** anything else which is not an unabiguous reference to a database column.
*/
public static string sqlite3_column_database_name( sqlite3_stmt pStmt, int N )
{
return columnName(
pStmt, N, sqlite3_value_text, COLNAME_DATABASE );
}
#if !SQLITE_OMIT_UTF16
const void *sqlite3_column_database_name16(sqlite3_stmt pStmt, int N){
return columnName(
pStmt, N, (const void*()(Mem))sqlite3_value_text16, COLNAME_DATABASE);
}
#endif //* SQLITE_OMIT_UTF16 */
/*
** Return the name of the table from which a result column derives.
** NULL is returned if the result column is an expression or constant or
** anything else which is not an unabiguous reference to a database column.
*/
public static string sqlite3_column_table_name( sqlite3_stmt pStmt, int N )
{
return columnName(
pStmt, N, sqlite3_value_text, COLNAME_TABLE );
}
#if !SQLITE_OMIT_UTF16
const void *sqlite3_column_table_name16(sqlite3_stmt pStmt, int N){
return columnName(
pStmt, N, (const void*()(Mem))sqlite3_value_text16, COLNAME_TABLE);
}
#endif //* SQLITE_OMIT_UTF16 */
/*
** Return the name of the table column from which a result column derives.
** NULL is returned if the result column is an expression or constant or
** anything else which is not an unabiguous reference to a database column.
*/
public static string sqlite3_column_origin_name( sqlite3_stmt pStmt, int N )
{
return columnName(
pStmt, N, sqlite3_value_text, COLNAME_COLUMN );
}
#if !SQLITE_OMIT_UTF16
const void *sqlite3_column_origin_name16(sqlite3_stmt pStmt, int N){
return columnName(
pStmt, N, (const void*()(Mem))sqlite3_value_text16, COLNAME_COLUMN);
}
#endif ///* SQLITE_OMIT_UTF16 */
#endif // * SQLITE_ENABLE_COLUMN_METADATA */
/******************************* sqlite3_bind_ ***************************
**
** Routines used to attach values to wildcards in a compiled SQL statement.
*/
/*
** Unbind the value bound to variable i in virtual machine p. This is the
** the same as binding a NULL value to the column. If the "i" parameter is
** out of range, then SQLITE_RANGE is returned. Othewise SQLITE_OK.
**
** A successful evaluation of this routine acquires the mutex on p.
** the mutex is released if any kind of error occurs.
**
** The error code stored in database p.db is overwritten with the return
** value in any case.
*/
public static int vdbeUnbind(Vdbe p, int i)
{
Mem pVar;
if (vdbeSafetyNotNull(p))
{
return SQLITE_MISUSE_BKPT();
}
sqlite3_mutex_enter(p.db.mutex);
if (p.magic != VDBE_MAGIC_RUN || p.pc >= 0)
{
sqlite3Error(p.db, SQLITE_MISUSE, 0);
sqlite3_mutex_leave(p.db.mutex);
sqlite3_log(SQLITE_MISUSE,
"bind on a busy prepared statement: [%s]", p.zSql);
return SQLITE_MISUSE_BKPT();
}
if (i < 1 || i > p.nVar)
{
sqlite3Error(p.db, SQLITE_RANGE, 0);
sqlite3_mutex_leave(p.db.mutex);
return SQLITE_RANGE;
}
i--;
pVar = p.aVar[i];
sqlite3VdbeMemRelease(pVar);
pVar.flags = MEM_Null;
sqlite3Error(p.db, SQLITE_OK, 0);
/* If the bit corresponding to this variable in Vdbe.expmask is set, then
** binding a new value to this variable invalidates the current query plan.
**
** IMPLEMENTATION-OF: R-48440-37595 If the specific value bound to host
** parameter in the WHERE clause might influence the choice of query plan
** for a statement, then the statement will be automatically recompiled,
** as if there had been a schema change, on the first sqlite3_step() call
** following any change to the bindings of that parameter.
*/
if (p.isPrepareV2 &&
((i < 32 && p.expmask != 0 & ((u32)1 << i) != 0) || p.expmask == 0xffffffff)
)
{
p.expired = true;
}
return SQLITE_OK;
}
/*
** Bind a text or BLOB value.
*/
private static int bindBlob(
sqlite3_stmt pStmt, /* The statement to bind against */
int i, /* Index of the parameter to bind */
byte[] zData, /* Pointer to the data to be bound */
int nData, /* Number of bytes of data to be bound */
dxDel xDel, /* Destructor for the data */
u8 encoding /* Encoding for the data */
)
{
Vdbe p = pStmt;
Mem pVar;
int rc;
rc = vdbeUnbind(p, i);
if (rc == SQLITE_OK)
{
if (zData != null)
{
pVar = p.aVar[i - 1];
rc = sqlite3VdbeMemSetBlob(pVar, zData, nData, encoding, xDel);
if (rc == SQLITE_OK && encoding != 0)
{
rc = sqlite3VdbeChangeEncoding(pVar, ENC(p.db));
}
sqlite3Error(p.db, rc, 0);
rc = sqlite3ApiExit(p.db, rc);
}
sqlite3_mutex_leave(p.db.mutex);
}
return rc;
}
/*
** Bind a text value.
*/
public static int bindText(
sqlite3_stmt pStmt, /* The statement to bind against */
int i, /* Index of the parameter to bind */
string zData, /* Pointer to the data to be bound */
int nData, /* Number of bytes of data to be bound */
dxDel xDel, /* Destructor for the data */
u8 encoding /* Encoding for the data */
)
{
Vdbe p = pStmt;
Mem pVar;
int rc;
rc = vdbeUnbind(p, i);
if (rc == SQLITE_OK)
{
if (zData != null)
{
pVar = p.aVar[i - 1];
rc = sqlite3VdbeMemSetStr(pVar, zData, nData, encoding, xDel);
if (rc == SQLITE_OK && encoding != 0)
{
rc = sqlite3VdbeChangeEncoding(pVar, ENC(p.db));
}
sqlite3Error(p.db, rc, 0);
rc = sqlite3ApiExit(p.db, rc);
}
sqlite3_mutex_leave(p.db.mutex);
}
else if (xDel != SQLITE_STATIC && xDel != SQLITE_TRANSIENT)
{
xDel(ref zData);
}
return rc;
}
public static int sqlite3_bind_double(sqlite3_stmt pStmt, int i, double rValue)
{
int rc;
Vdbe p = pStmt;
rc = vdbeUnbind(p, i);
if (rc == SQLITE_OK)
{
sqlite3VdbeMemSetDouble(p.aVar[i - 1], rValue);
sqlite3_mutex_leave(p.db.mutex);
}
return rc;
}
public static int sqlite3_bind_int(sqlite3_stmt p, int i, int iValue)
{
return sqlite3_bind_int64(p, i, (i64)iValue);
}
public static int sqlite3_bind_int64(sqlite3_stmt pStmt, int i, sqlite_int64 iValue)
{
int rc;
Vdbe p = pStmt;
rc = vdbeUnbind(p, i);
if (rc == SQLITE_OK)
{
sqlite3VdbeMemSetInt64(p.aVar[i - 1], iValue);
sqlite3_mutex_leave(p.db.mutex);
}
return rc;
}
public static int sqlite3_bind_null(sqlite3_stmt pStmt, int i)
{
int rc;
Vdbe p = (Vdbe)pStmt;
rc = vdbeUnbind(p, i);
if (rc == SQLITE_OK)
{
sqlite3_mutex_leave(p.db.mutex);
}
return rc;
}
public static int sqlite3_bind_text(
sqlite3_stmt pStmt,
int i,
string zData,
int nData,
dxDel xDel
)
{
return bindText(pStmt, i, zData, nData, xDel, SQLITE_UTF8);
}
public static int sqlite3_bind_blob(
sqlite3_stmt pStmt,
int i,
byte[] zData,
int nData,
dxDel xDel
)
{
return bindBlob(pStmt, i, zData, nData >= 0 ? nData : zData.Length, xDel, 0);
}
#if !SQLITE_OMIT_UTF16
static int sqlite3_bind_text16(
sqlite3_stmt pStmt,
int i,
string zData,
int nData,
dxDel xDel
){
return bindText(pStmt, i, zData, nData, xDel, SQLITE_UTF16NATIVE);
}
#endif // * SQLITE_OMIT_UTF16 */
public static int sqlite3_bind_value(sqlite3_stmt pStmt, int i, sqlite3_value pValue)
{
int rc;
switch (pValue.type)
{
case SQLITE_INTEGER:
{
rc = sqlite3_bind_int64(pStmt, i, pValue.u.i);
break;
}
case SQLITE_FLOAT:
{
rc = sqlite3_bind_double(pStmt, i, pValue.r);
break;
}
case SQLITE_BLOB:
{
if ((pValue.flags & MEM_Zero) != 0)
{
rc = sqlite3_bind_zeroblob(pStmt, i, pValue.u.nZero);
}
else
{
rc = sqlite3_bind_blob(pStmt, i, pValue.zBLOB, pValue.n, SQLITE_TRANSIENT);
}
break;
}
case SQLITE_TEXT:
{
rc = bindText(pStmt, i, pValue.z, pValue.n, SQLITE_TRANSIENT,
pValue.enc);
break;
}
default:
{
rc = sqlite3_bind_null(pStmt, i);
break;
}
}
return rc;
}
public static int sqlite3_bind_zeroblob(sqlite3_stmt pStmt, int i, int n)
{
int rc;
Vdbe p = pStmt;
rc = vdbeUnbind(p, i);
if (rc == SQLITE_OK)
{
sqlite3VdbeMemSetZeroBlob(p.aVar[i - 1], n);
sqlite3_mutex_leave(p.db.mutex);
}
return rc;
}
/*
** Return the number of wildcards that can be potentially bound to.
** This routine is added to support DBD::SQLite.
*/
public static int sqlite3_bind_parameter_count(sqlite3_stmt pStmt)
{
Vdbe p = (Vdbe)pStmt;
return (p != null) ? (int)p.nVar : 0;
}
/*
** Return the name of a wildcard parameter. Return NULL if the index
** is out of range or if the wildcard is unnamed.
**
** The result is always UTF-8.
*/
public static string sqlite3_bind_parameter_name(sqlite3_stmt pStmt, int i)
{
Vdbe p = (Vdbe)pStmt;
if (p == null || i < 1 || i > p.nzVar)
{
return "";
}
return p.azVar[i - 1];
}
/*
** Given a wildcard parameter name, return the index of the variable
** with that name. If there is no variable with the given name,
** return 0.
*/
public static int sqlite3VdbeParameterIndex(Vdbe p, string zName, int nName)
{
int i;
if (p == null)
{
return 0;
}
if (zName != null && zName != "")
{
for (i = 0; i < p.nzVar; i++)
{
string z = p.azVar[i];
if (z != null && z == zName)//&& memcmp(z,zName,nName)==0 && z[nName]==0)
{
return i + 1;
}
}
}
return 0;
}
public static int sqlite3_bind_parameter_index(sqlite3_stmt pStmt, string zName)
{
return sqlite3VdbeParameterIndex((Vdbe)pStmt, zName, sqlite3Strlen30(zName));
}
/*
** Transfer all bindings from the first statement over to the second.
*/
public static int sqlite3TransferBindings(sqlite3_stmt pFromStmt, sqlite3_stmt pToStmt)
{
Vdbe pFrom = (Vdbe)pFromStmt;
Vdbe pTo = (Vdbe)pToStmt;
int i;
Debug.Assert(pTo.db == pFrom.db);
Debug.Assert(pTo.nVar == pFrom.nVar);
sqlite3_mutex_enter(pTo.db.mutex);
for (i = 0; i < pFrom.nVar; i++)
{
sqlite3VdbeMemMove(pTo.aVar[i], pFrom.aVar[i]);
}
sqlite3_mutex_leave(pTo.db.mutex);
return SQLITE_OK;
}
#if !SQLITE_OMIT_DEPRECATED
/*
** Deprecated external interface. Internal/core SQLite code
** should call sqlite3TransferBindings.
**
** Is is misuse to call this routine with statements from different
** database connections. But as this is a deprecated interface, we
** will not bother to check for that condition.
**
** If the two statements contain a different number of bindings, then
** an SQLITE_ERROR is returned. Nothing else can go wrong, so otherwise
** SQLITE_OK is returned.
*/
static int sqlite3_transfer_bindings( sqlite3_stmt pFromStmt, sqlite3_stmt pToStmt )
{
Vdbe pFrom = (Vdbe)pFromStmt;
Vdbe pTo = (Vdbe)pToStmt;
if ( pFrom.nVar != pTo.nVar )
{
return SQLITE_ERROR;
}
if( pTo.isPrepareV2 && pTo.expmask ){
pTo.expired = 1;
}
if( pFrom.isPrepareV2 && pFrom.expmask ){
pFrom.expired = 1;
}
return sqlite3TransferBindings( pFromStmt, pToStmt );
}
#endif
/*
** Return the sqlite3* database handle to which the prepared statement given
** in the argument belongs. This is the same database handle that was
** the first argument to the sqlite3_prepare() that was used to create
** the statement in the first place.
*/
public static sqlite3 sqlite3_db_handle(sqlite3_stmt pStmt)
{
return pStmt != null ? ((Vdbe)pStmt).db : null;
}
/*
** Return true if the prepared statement is guaranteed to not modify the
** database.
*/
private static bool sqlite3_stmt_readonly(sqlite3_stmt pStmt)
{
return pStmt != null ? ((Vdbe)pStmt).readOnly : true;
}
/*
** Return a pointer to the next prepared statement after pStmt associated
** with database connection pDb. If pStmt is NULL, return the first
** prepared statement for the database connection. Return NULL if there
** are no more.
*/
public static sqlite3_stmt sqlite3_next_stmt(sqlite3 pDb, sqlite3_stmt pStmt)
{
sqlite3_stmt pNext;
sqlite3_mutex_enter(pDb.mutex);
if (pStmt == null)
{
pNext = (sqlite3_stmt)pDb.pVdbe;
}
else
{
pNext = (sqlite3_stmt)((Vdbe)pStmt).pNext;
}
sqlite3_mutex_leave(pDb.mutex);
return pNext;
}
/*
** Return the value of a status counter for a prepared statement
*/
public static int sqlite3_stmt_status(sqlite3_stmt pStmt, int op, int resetFlag)
{
Vdbe pVdbe = (Vdbe)pStmt;
int v = pVdbe.aCounter[op - 1];
if (resetFlag != 0)
pVdbe.aCounter[op - 1] = 0;
return v;
}
}
}
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