236 lines
8.3 KiB
C#
236 lines
8.3 KiB
C#
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using System;
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using System.Diagnostics;
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using System.Text;
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namespace Community.CsharpSqlite
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{
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using sqlite3_callback = Sqlite3.dxCallback;
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using sqlite3_stmt = Sqlite3.Vdbe;
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public partial class Sqlite3
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{
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/*
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** 2001 September 15
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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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** Main file for the SQLite library. The routines in this file
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** implement the programmer interface to the library. Routines in
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** other files are for internal use by SQLite and should not be
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** accessed by users of the library.
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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: 2010-08-23 18:52:01 42537b60566f288167f1b5864a5435986838e3a3
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**
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*************************************************************************
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*/
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//#include "sqliteInt.h"
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/*
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** Execute SQL code. Return one of the SQLITE_ success/failure
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** codes. Also write an error message into memory obtained from
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** malloc() and make pzErrMsg point to that message.
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**
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** If the SQL is a query, then for each row in the query result
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** the xCallback() function is called. pArg becomes the first
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** argument to xCallback(). If xCallback=NULL then no callback
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** is invoked, even for queries.
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*/
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//C# Alias
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static public int exec( sqlite3 db, /* The database on which the SQL executes */ string zSql, /* The SQL to be executed */ int NoCallback, int NoArgs, int NoErrors )
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{
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string Errors = "";
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return sqlite3_exec( db, zSql, null, null, ref Errors );
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}
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static public int exec( sqlite3 db, /* The database on which the SQL executes */ string zSql, /* The SQL to be executed */ sqlite3_callback xCallback, /* Invoke this callback routine */ object pArg, /* First argument to xCallback() */ int NoErrors )
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{
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string Errors = "";
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return sqlite3_exec( db, zSql, xCallback, pArg, ref Errors );
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}
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static public int exec( sqlite3 db, /* The database on which the SQL executes */ string zSql, /* The SQL to be executed */ sqlite3_callback xCallback, /* Invoke this callback routine */ object pArg, /* First argument to xCallback() */ ref string pzErrMsg /* Write error messages here */)
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{
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return sqlite3_exec( db, zSql, xCallback, pArg, ref pzErrMsg );
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}
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//OVERLOADS
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static public int sqlite3_exec(
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sqlite3 db, /* The database on which the SQL executes */
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string zSql, /* The SQL to be executed */
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int NoCallback, int NoArgs, int NoErrors
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)
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{
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string Errors = "";
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return sqlite3_exec( db, zSql, null, null, ref Errors );
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}
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static public int sqlite3_exec(
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sqlite3 db, /* The database on which the SQL executes */
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string zSql, /* The SQL to be executed */
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sqlite3_callback xCallback, /* Invoke this callback routine */
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object pArg, /* First argument to xCallback() */
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int NoErrors
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)
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{
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string Errors = "";
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return sqlite3_exec( db, zSql, xCallback, pArg, ref Errors );
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}
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static public int sqlite3_exec(
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sqlite3 db, /* The database on which the SQL executes */
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string zSql, /* The SQL to be executed */
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sqlite3_callback xCallback, /* Invoke this callback routine */
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object pArg, /* First argument to xCallback() */
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ref string pzErrMsg /* Write error messages here */
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)
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{
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int rc = SQLITE_OK; /* Return code */
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string zLeftover = ""; /* Tail of unprocessed SQL */
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sqlite3_stmt pStmt = null; /* The current SQL statement */
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string[] azCols = null; /* Names of result columns */
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int nRetry = 0; /* Number of retry attempts */
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int callbackIsInit; /* True if callback data is initialized */
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if ( !sqlite3SafetyCheckOk( db ) )
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return SQLITE_MISUSE_BKPT();
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if ( zSql == null )
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zSql = "";
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sqlite3_mutex_enter( db.mutex );
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sqlite3Error( db, SQLITE_OK, 0 );
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while ( ( rc == SQLITE_OK || ( rc == SQLITE_SCHEMA && ( ++nRetry ) < 2 ) ) && zSql != "" )
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{
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int nCol;
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string[] azVals = null;
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pStmt = null;
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rc = sqlite3_prepare( db, zSql, -1, ref pStmt, ref zLeftover );
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Debug.Assert( rc == SQLITE_OK || pStmt == null );
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if ( rc != SQLITE_OK )
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{
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continue;
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}
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if ( pStmt == null )
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{
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/* this happens for a comment or white-space */
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zSql = zLeftover;
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continue;
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}
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callbackIsInit = 0;
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nCol = sqlite3_column_count( pStmt );
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while ( true )
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{
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int i;
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rc = sqlite3_step( pStmt );
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/* Invoke the callback function if required */
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if ( xCallback != null && ( SQLITE_ROW == rc ||
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( SQLITE_DONE == rc && callbackIsInit == 0
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&& ( db.flags & SQLITE_NullCallback ) != 0 ) ) )
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{
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if ( 0 == callbackIsInit )
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{
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azCols = new string[nCol];//sqlite3DbMallocZero(db, 2*nCol*sizeof(const char*) + 1);
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//if ( azCols == null )
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//{
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// goto exec_out;
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//}
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for ( i = 0; i < nCol; i++ )
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{
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azCols[i] = sqlite3_column_name( pStmt, i );
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/* sqlite3VdbeSetColName() installs column names as UTF8
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** strings so there is no way for sqlite3_column_name() to fail. */
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Debug.Assert( azCols[i] != null );
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}
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callbackIsInit = 1;
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}
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if ( rc == SQLITE_ROW )
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{
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azVals = new string[nCol];// azCols[nCol];
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for ( i = 0; i < nCol; i++ )
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{
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azVals[i] = sqlite3_column_text( pStmt, i );
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if ( azVals[i] == null && sqlite3_column_type( pStmt, i ) != SQLITE_NULL )
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{
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//db.mallocFailed = 1;
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//goto exec_out;
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}
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}
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}
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if ( xCallback( pArg, nCol, azVals, azCols ) != 0 )
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{
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rc = SQLITE_ABORT;
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sqlite3VdbeFinalize( ref pStmt );
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pStmt = null;
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sqlite3Error( db, SQLITE_ABORT, 0 );
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goto exec_out;
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}
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}
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if ( rc != SQLITE_ROW )
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{
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rc = sqlite3VdbeFinalize( ref pStmt );
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pStmt = null;
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if ( rc != SQLITE_SCHEMA )
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{
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nRetry = 0;
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if ( ( zSql = zLeftover ) != "" )
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{
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int zindex = 0;
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while ( zindex < zSql.Length && sqlite3Isspace( zSql[zindex] ) )
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zindex++;
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if ( zindex != 0 )
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zSql = zindex < zSql.Length ? zSql.Substring( zindex ) : "";
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}
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}
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break;
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}
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}
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sqlite3DbFree( db, ref azCols );
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azCols = null;
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}
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exec_out:
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if ( pStmt != null )
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sqlite3VdbeFinalize( ref pStmt );
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sqlite3DbFree( db, ref azCols );
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rc = sqlite3ApiExit( db, rc );
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if ( rc != SQLITE_OK && ALWAYS( rc == sqlite3_errcode( db ) ) && pzErrMsg != null )
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{
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//int nErrMsg = 1 + sqlite3Strlen30(sqlite3_errmsg(db));
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//pzErrMsg = sqlite3Malloc(nErrMsg);
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//if (pzErrMsg)
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//{
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// memcpy(pzErrMsg, sqlite3_errmsg(db), nErrMsg);
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//}else{
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//rc = SQLITE_NOMEM;
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//sqlite3Error(db, SQLITE_NOMEM, 0);
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//}
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pzErrMsg = sqlite3_errmsg( db );
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}
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else if ( pzErrMsg != "" )
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{
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pzErrMsg = "";
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}
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Debug.Assert( ( rc & db.errMask ) == rc );
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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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}
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