internal override SqliteStatement Prepare(SqliteConnection cnn, string strSql, SqliteStatement previous, uint timeoutMS, out string strRemain)
{
IntPtr stmt = IntPtr.Zero;
IntPtr ptr = IntPtr.Zero;
int len = 0;
int n = 17;
int retries = 0;
byte[] b = ToUTF8(strSql);
string typedefs = null;
SqliteStatement cmd = null;
Random rnd = null;
uint starttick = (uint)Environment.TickCount;
GCHandle handle = GCHandle.Alloc(b, GCHandleType.Pinned);
IntPtr psql = handle.AddrOfPinnedObject();
try
{
while ((n == 17 || n == 6 || n == 5) && retries < 3)
{
#if !SQLITE_STANDARD
n = UnsafeNativeMethods.sqlite3_prepare_interop(_sql, psql, b.Length - 1, out stmt, out ptr, out len);
#else
n = UnsafeNativeMethods.sqlite3_prepare(_sql, psql, b.Length - 1, out stmt, out ptr);
len = -1;
#endif
if (n == 17)
{
retries++;
}
else if (n == 1)
{
if (String.Compare(SQLiteLastError(), "near \"TYPES\": syntax error", StringComparison.OrdinalIgnoreCase) == 0)
{
int pos = strSql.IndexOf(';');
if (pos == -1)
{
pos = strSql.Length - 1;
}
typedefs = strSql.Substring(0, pos + 1);
strSql = strSql.Substring(pos + 1);
strRemain = "";
while (cmd == null && strSql.Length > 0)
{
cmd = Prepare(cnn, strSql, previous, timeoutMS, out strRemain);
strSql = strRemain;
}
if (cmd != null)
{
cmd.SetTypes(typedefs);
}
return(cmd);
}
#if PLATFORM_COMPACTFRAMEWORK
else if (_buildingSchema == false && String.Compare(SQLiteLastError(), 0, "no such table: TEMP.SCHEMA", 0, 26, StringComparison.OrdinalIgnoreCase) == 0)
{
strRemain = "";
_buildingSchema = true;
try
{
ISQLiteSchemaExtensions ext = ((IServiceProvider)SqliteFactory.Instance).GetService(typeof(ISQLiteSchemaExtensions)) as ISQLiteSchemaExtensions;
if (ext != null)
{
ext.BuildTempSchema(cnn);
}
while (cmd == null && strSql.Length > 0)
{
cmd = Prepare(cnn, strSql, previous, timeoutMS, out strRemain);
strSql = strRemain;
}
return(cmd);
}
finally
{
_buildingSchema = false;
}
}
#endif
}
else if (n == 6 || n == 5) // Locked -- delay a small amount before retrying
{
// Keep trying
if (rnd == null) // First time we've encountered the lock
{
rnd = new Random();
}
// If we've exceeded the command's timeout, give up and throw an error
if ((uint)Environment.TickCount - starttick > timeoutMS)
{
throw new SqliteException(n, SQLiteLastError());
}
else
{
// Otherwise sleep for a random amount of time up to 150ms
System.Threading.Thread.CurrentThread.Join(rnd.Next(1, 150));
}
}
}
if (n > 0)
{
throw new SqliteException(n, SQLiteLastError());
}
strRemain = UTF8ToString(ptr, len);
if (stmt != IntPtr.Zero)
{
cmd = new SqliteStatement(this, stmt, strSql.Substring(0, strSql.Length - strRemain.Length), previous);
}
return(cmd);
}
finally
{
handle.Free();
}
}
internal override SQLiteStatement Prepare(SQLiteConnection cnn, string strSql, SQLiteStatement previous, uint timeoutMS, out string strRemain)
{
SQLiteStatement statement2;
IntPtr zero = IntPtr.Zero;
IntPtr ptrRemain = IntPtr.Zero;
int nRemain = 0;
int errorCode = 0x11;
int num3 = 0;
byte[] buffer = SQLiteConvert.ToUTF8(strSql);
string typedefs = null;
SQLiteStatement statement = null;
Random random = null;
uint tickCount = (uint)Environment.TickCount;
GCHandle handle = GCHandle.Alloc(buffer, GCHandleType.Pinned);
IntPtr pSql = handle.AddrOfPinnedObject();
try
{
while ((((errorCode == 0x11) || (errorCode == 6)) || (errorCode == 5)) && (num3 < 3))
{
errorCode = UnsafeNativeMethods.sqlite3_prepare_interop((IntPtr)this._sql, pSql, buffer.Length - 1, out zero, out ptrRemain, out nRemain);
if (errorCode == 0x11)
{
num3++;
}
else
{
if (errorCode == 1)
{
if (string.Compare(this.SQLiteLastError(), "near \"TYPES\": syntax error", StringComparison.OrdinalIgnoreCase) == 0)
{
int index = strSql.IndexOf(';');
if (index == -1)
{
index = strSql.Length - 1;
}
typedefs = strSql.Substring(0, index + 1);
strSql = strSql.Substring(index + 1);
strRemain = "";
while ((statement == null) && (strSql.Length > 0))
{
statement = this.Prepare(cnn, strSql, previous, timeoutMS, out strRemain);
strSql = strRemain;
}
if (statement != null)
{
statement.SetTypes(typedefs);
}
return(statement);
}
if (this._buildingSchema || (string.Compare(this.SQLiteLastError(), 0, "no such table: TEMP.SCHEMA", 0, 0x1a, StringComparison.OrdinalIgnoreCase) != 0))
{
continue;
}
strRemain = "";
this._buildingSchema = true;
try
{
ISQLiteSchemaExtensions service = ((IServiceProvider)SQLiteFactory.Instance).GetService(typeof(ISQLiteSchemaExtensions)) as ISQLiteSchemaExtensions;
if (service != null)
{
service.BuildTempSchema(cnn);
}
while ((statement == null) && (strSql.Length > 0))
{
statement = this.Prepare(cnn, strSql, previous, timeoutMS, out strRemain);
strSql = strRemain;
}
return(statement);
}
finally
{
this._buildingSchema = false;
}
}
switch (errorCode)
{
case 6:
case 5:
if (random == null)
{
random = new Random();
}
if ((Environment.TickCount - tickCount) > timeoutMS)
{
throw new SQLiteException(errorCode, this.SQLiteLastError());
}
Thread.Sleep(random.Next(1, 150));
break;
}
}
}
if (errorCode > 0)
{
throw new SQLiteException(errorCode, this.SQLiteLastError());
}
strRemain = SQLiteConvert.UTF8ToString(ptrRemain, nRemain);
if (zero != IntPtr.Zero)
{
statement = new SQLiteStatement(this, zero, strSql.Substring(0, strSql.Length - strRemain.Length), previous);
}
statement2 = statement;
}
finally
{
handle.Free();
}
return(statement2);
}
