284 lines
No EOL
7.9 KiB
C#
284 lines
No EOL
7.9 KiB
C#
using System.Diagnostics;
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namespace Community.CsharpSqlite
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{
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public partial class Sqlite3
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{
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/*
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** 2008 June 18
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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 module implements the sqlite3_status() interface and related
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** functionality.
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*************************************************************************
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** Included in SQLite3 port to C#-SQLite; 2008 Noah B Hart
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** C#-SQLite is an independent reimplementation of the SQLite software library
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**
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** SQLITE_SOURCE_ID: 2011-05-19 13:26:54 ed1da510a239ea767a01dc332b667119fa3c908e
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**
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*************************************************************************
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*/
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//#include "sqliteInt.h"
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//#include "vdbeInt.h"
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/*
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** Variables in which to record status information.
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*/
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//typedef struct sqlite3StatType sqlite3StatType;
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public class sqlite3StatType
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{
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public int[] nowValue = new int[10]; /* Current value */
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public int[] mxValue = new int[10]; /* Maximum value */
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}
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public static sqlite3StatType sqlite3Stat = new sqlite3StatType();
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/* The "wsdStat" macro will resolve to the status information
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** state vector. If writable static data is unsupported on the target,
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** we have to locate the state vector at run-time. In the more common
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** case where writable static data is supported, wsdStat can refer directly
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** to the "sqlite3Stat" state vector declared above.
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*/
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#if SQLITE_OMIT_WSD
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//# define wsdStatInit sqlite3StatType *x = &GLOBAL(sqlite3StatType,sqlite3Stat)
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//# define wsdStat x[0]
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#else
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//# define wsdStatInit
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private static void wsdStatInit()
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{
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}
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//# define wsdStat sqlite3Stat
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private static sqlite3StatType wsdStat = sqlite3Stat;
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#endif
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/*
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** Return the current value of a status parameter.
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*/
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private static int sqlite3StatusValue(int op)
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{
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wsdStatInit();
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Debug.Assert(op >= 0 && op < ArraySize(wsdStat.nowValue));
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return wsdStat.nowValue[op];
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}
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/*
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** Add N to the value of a status record. It is assumed that the
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** caller holds appropriate locks.
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*/
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private static void sqlite3StatusAdd(int op, int N)
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{
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wsdStatInit();
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Debug.Assert(op >= 0 && op < ArraySize(wsdStat.nowValue));
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wsdStat.nowValue[op] += N;
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if (wsdStat.nowValue[op] > wsdStat.mxValue[op])
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{
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wsdStat.mxValue[op] = wsdStat.nowValue[op];
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}
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}
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/*
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** Set the value of a status to X.
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*/
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private static void sqlite3StatusSet(int op, int X)
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{
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wsdStatInit();
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Debug.Assert(op >= 0 && op < ArraySize(wsdStat.nowValue));
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wsdStat.nowValue[op] = X;
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if (wsdStat.nowValue[op] > wsdStat.mxValue[op])
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{
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wsdStat.mxValue[op] = wsdStat.nowValue[op];
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}
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}
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/*
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** Query status information.
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**
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** This implementation assumes that reading or writing an aligned
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** 32-bit integer is an atomic operation. If that assumption is not true,
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** then this routine is not threadsafe.
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*/
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static public int sqlite3_status(int op, ref int pCurrent, ref int pHighwater, int resetFlag)
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{
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wsdStatInit();
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if (op < 0 || op >= ArraySize(wsdStat.nowValue))
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{
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return SQLITE_MISUSE_BKPT();
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}
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pCurrent = wsdStat.nowValue[op];
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pHighwater = wsdStat.mxValue[op];
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if (resetFlag != 0)
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{
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wsdStat.mxValue[op] = wsdStat.nowValue[op];
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}
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return SQLITE_OK;
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}
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/*
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** Query status information for a single database connection
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*/
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static public int sqlite3_db_status(
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sqlite3 db, /* The database connection whose status is desired */
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int op, /* Status verb */
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ref int pCurrent, /* Write current value here */
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ref int pHighwater, /* Write high-water mark here */
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int resetFlag /* Reset high-water mark if true */
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)
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{
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int rc = SQLITE_OK; /* Return code */
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sqlite3_mutex_enter(db.mutex);
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switch (op)
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{
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case SQLITE_DBSTATUS_LOOKASIDE_USED:
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{
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pCurrent = db.lookaside.nOut;
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pHighwater = db.lookaside.mxOut;
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if (resetFlag != 0)
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{
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db.lookaside.mxOut = db.lookaside.nOut;
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}
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break;
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}
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case SQLITE_DBSTATUS_LOOKASIDE_HIT:
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case SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE:
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case SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL:
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{
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testcase(op == SQLITE_DBSTATUS_LOOKASIDE_HIT);
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testcase(op == SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE);
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testcase(op == SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL);
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Debug.Assert((op - SQLITE_DBSTATUS_LOOKASIDE_HIT) >= 0);
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Debug.Assert((op - SQLITE_DBSTATUS_LOOKASIDE_HIT) < 3);
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pCurrent = 0;
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pHighwater = db.lookaside.anStat[op - SQLITE_DBSTATUS_LOOKASIDE_HIT];
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if (resetFlag != 0)
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{
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db.lookaside.anStat[op - SQLITE_DBSTATUS_LOOKASIDE_HIT] = 0;
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}
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break;
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}
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/*
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** Return an approximation for the amount of memory currently used
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** by all pagers associated with the given database connection. The
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** highwater mark is meaningless and is returned as zero.
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*/
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case SQLITE_DBSTATUS_CACHE_USED:
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{
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int totalUsed = 0;
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int i;
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sqlite3BtreeEnterAll(db);
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for (i = 0; i < db.nDb; i++)
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{
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Btree pBt = db.aDb[i].pBt;
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if (pBt != null)
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{
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Pager pPager = sqlite3BtreePager(pBt);
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totalUsed += sqlite3PagerMemUsed(pPager);
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}
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}
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sqlite3BtreeLeaveAll(db);
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pCurrent = totalUsed;
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pHighwater = 0;
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break;
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}
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/*
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** *pCurrent gets an accurate estimate of the amount of memory used
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** to store the schema for all databases (main, temp, and any ATTACHed
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** databases. *pHighwater is set to zero.
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*/
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case SQLITE_DBSTATUS_SCHEMA_USED:
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{
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int i; /* Used to iterate through schemas */
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int nByte = 0; /* Used to accumulate return value */
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sqlite3BtreeEnterAll(db);
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//db.pnBytesFreed = nByte;
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for (i = 0; i < db.nDb; i++)
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{
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Schema pSchema = db.aDb[i].pSchema;
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if (ALWAYS(pSchema != null))
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{
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HashElem p;
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//nByte += (int)(sqlite3GlobalConfig.m.xRoundup(sizeof(HashElem)) * (
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// pSchema.tblHash.count
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// + pSchema.trigHash.count
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// + pSchema.idxHash.count
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// + pSchema.fkeyHash.count
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//));
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//nByte += (int)sqlite3MallocSize( pSchema.tblHash.ht );
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//nByte += (int)sqlite3MallocSize( pSchema.trigHash.ht );
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//nByte += (int)sqlite3MallocSize( pSchema.idxHash.ht );
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//nByte += (int)sqlite3MallocSize( pSchema.fkeyHash.ht );
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for (p = sqliteHashFirst(pSchema.trigHash); p != null; p = sqliteHashNext(p))
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{
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Trigger t = (Trigger)sqliteHashData(p);
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sqlite3DeleteTrigger(db, ref t);
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}
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for (p = sqliteHashFirst(pSchema.tblHash); p != null; p = sqliteHashNext(p))
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{
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Table t = (Table)sqliteHashData(p);
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sqlite3DeleteTable(db, ref t);
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}
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}
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}
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db.pnBytesFreed = 0;
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sqlite3BtreeLeaveAll(db);
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pHighwater = 0;
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pCurrent = nByte;
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break;
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}
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/*
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** *pCurrent gets an accurate estimate of the amount of memory used
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** to store all prepared statements.
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** *pHighwater is set to zero.
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*/
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case SQLITE_DBSTATUS_STMT_USED:
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{
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Vdbe pVdbe; /* Used to iterate through VMs */
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int nByte = 0; /* Used to accumulate return value */
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//db.pnBytesFreed = nByte;
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for (pVdbe = db.pVdbe; pVdbe != null; pVdbe = pVdbe.pNext)
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{
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sqlite3VdbeDeleteObject(db, ref pVdbe);
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}
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db.pnBytesFreed = 0;
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pHighwater = 0;
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pCurrent = nByte;
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break;
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}
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default:
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{
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rc = SQLITE_ERROR;
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break;
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}
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}
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sqlite3_mutex_leave(db.mutex);
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return rc;
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}
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}
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} |