抛弃GdCpp*.dll/pdb历史重新建库。libhv和Sqlite的dll保留
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Zhang Jianjun
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source/CSQLite/CSQLiteStatement.cpp
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199
source/CSQLite/CSQLiteStatement.cpp
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/**
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* @file Statement.cpp
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* @ingroup CSQLite
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* @brief A prepared SQLite Statement is a compiled SQL query ready to be executed, pointing to a row of result.
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*
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* Copyright (c) 2012-2019 Sebastien Rombauts (sebastien.rombauts@gmail.com)
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*
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* Distributed under the MIT License (MIT) (See accompanying file LICENSE.txt
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* or copy at http://opensource.org/licenses/MIT)
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*/
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#include "pch.h"
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#include "CSQLite/CSQLite.h"
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#include <sqlite3.h>
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// Compile and register the SQL query for the provided SQLite Database Connection
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CSQLiteStatement::CSQLiteStatement(CSQLiteDB &aDatabase, const char* apQuery) :
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mQuery(apQuery),
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mStmtPtr(std::make_shared<_Statement>(aDatabase.mpSQLite, mQuery)), // prepare the SQL query, and ref count (needs Database friendship)
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mColumnCount(0),
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mbHasRow(false),
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mbDone(false)
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{
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mColumnCount = sqlite3_column_count(*mStmtPtr);
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}
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// Compile and register the SQL query for the provided SQLite Database Connection
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CSQLiteStatement::CSQLiteStatement(CSQLiteDB &aDatabase, const std::string& aQuery) :
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mQuery(aQuery),
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mStmtPtr(std::make_shared<_Statement>(aDatabase.mpSQLite, mQuery)), // prepare the SQL query, and ref count (needs Database friendship)
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mColumnCount(0),
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mbHasRow(false),
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mbDone(false)
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{
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mColumnCount = sqlite3_column_count(*mStmtPtr);
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}
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CSQLiteStatement::CSQLiteStatement(CSQLiteStatement&& aStatement) noexcept :
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mQuery(std::move(aStatement.mQuery)),
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mStmtPtr(std::move(aStatement.mStmtPtr)),
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mColumnCount(aStatement.mColumnCount),
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mbHasRow(aStatement.mbHasRow),
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mbDone(aStatement.mbDone)
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{
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aStatement.mColumnCount = 0;
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aStatement.mbHasRow = false;
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aStatement.mbDone = false;
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}
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// Finalize and unregister the SQL query from the SQLite Database Connection.
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CSQLiteStatement::~CSQLiteStatement()
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{
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// the finalization will be done by the destructor of the last shared pointer
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}
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// Execute a step of the query to fetch one row of results
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bool CSQLiteStatement::executeStep()
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{
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const int ret = tryExecuteStep();
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if ((SQLITE_ROW != ret) && (SQLITE_DONE != ret)) // on row or no (more) row ready, else it's a problem
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{
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if (ret == sqlite3_errcode(*mStmtPtr))
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{
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throw CSQLiteException(*mStmtPtr, ret);
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}
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else
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{
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throw CSQLiteException("Statement needs to be reseted", ret);
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}
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}
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return mbHasRow; // true only if one row is accessible by getColumn(N)
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}
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// Execute a one-step query with no expected result
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int CSQLiteStatement::exec()
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{
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const int ret = tryExecuteStep();
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if (SQLITE_DONE != ret) // the statement has finished executing successfully
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{
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if (SQLITE_ROW == ret)
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{
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throw CSQLiteException("exec() does not expect results. Use executeStep.");
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}
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else if (ret == sqlite3_errcode(*mStmtPtr))
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{
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throw CSQLiteException(*mStmtPtr, ret);
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}
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else
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{
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throw CSQLiteException("Statement needs to be reseted", ret);
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}
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}
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// Return the number of rows modified by those SQL statements (INSERT, UPDATE or DELETE)
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return sqlite3_changes(*mStmtPtr);
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}
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int CSQLiteStatement::tryExecuteStep() noexcept
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{
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if (false == mbDone)
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{
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const int ret = sqlite3_step(*mStmtPtr);
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if (SQLITE_ROW == ret) // one row is ready : call getColumn(N) to access it
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{
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mbHasRow = true;
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}
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else if (SQLITE_DONE == ret) // no (more) row ready : the query has finished executing
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{
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mbHasRow = false;
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mbDone = true;
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}
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else
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{
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mbHasRow = false;
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mbDone = false;
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}
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return ret;
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}
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else
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{
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// Statement needs to be reseted !
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return SQLITE_MISUSE;
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}
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}
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// Return the named assigned to the specified result column (potentially aliased)
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const char* CSQLiteStatement::getColumnName(const int aIndex) const
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{
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checkIndex(aIndex);
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return sqlite3_column_name(*mStmtPtr, aIndex);
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}
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#ifdef SQLITE_ENABLE_COLUMN_METADATA
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// Return the named assigned to the specified result column (potentially aliased)
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const char* CSQLiteStatement::getColumnOriginName(const int aIndex) const
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{
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checkIndex(aIndex);
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return sqlite3_column_origin_name(*mStmtPtr, aIndex);
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}
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#endif
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// Return the index of the specified (potentially aliased) column name
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int CSQLiteStatement::getColumnIndex(const char* apName) const
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{
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// Build the map of column index by name on first call
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if (mColumnNames.empty())
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{
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for (int i = 0; i < mColumnCount; ++i)
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{
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const char* pName = sqlite3_column_name(*mStmtPtr, i);
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mColumnNames[pName] = i;
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}
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}
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const TColumnNames::const_iterator iIndex = mColumnNames.find(apName);
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if (iIndex == mColumnNames.end())
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{
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std::string errStr = "Unknown column name:";
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errStr += apName;
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throw CSQLiteException(errStr);
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}
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return (*iIndex).second;
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}
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int CSQLiteStatement::getBindParameterCount() const noexcept
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{
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return sqlite3_bind_parameter_count(*mStmtPtr);
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}
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// Return the numeric result code for the most recent failed API call (if any).
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int CSQLiteStatement::getErrorCode() const noexcept // nothrow
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{
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return sqlite3_errcode(*mStmtPtr);
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}
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// Return the extended numeric result code for the most recent failed API call (if any).
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int CSQLiteStatement::getExtendedErrorCode() const noexcept // nothrow
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{
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return sqlite3_extended_errcode(*mStmtPtr);
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}
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// Return UTF-8 encoded English language explanation of the most recent failed API call (if any).
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const char* CSQLiteStatement::getErrorMsg() const noexcept // nothrow
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{
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return sqlite3_errmsg(*mStmtPtr);
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}
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// Return a UTF-8 string containing the SQL text of prepared statement with bound parameters expanded.
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std::string CSQLiteStatement::getExpandedSQL() {
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char* expanded = sqlite3_expanded_sql(*mStmtPtr);
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std::string expandedString(expanded);
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sqlite3_free(expanded);
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return expandedString;
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}
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