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<h1>sq3_log_db.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001
<a name="l00002"></a>00002 <span class="preprocessor">#include "sq3_log_db.hpp"</span>
<a name="l00003"></a>00003 <span class="preprocessor">#include <iostream></span>
<a name="l00004"></a>00004 <span class="preprocessor">#include <sstream></span>
<a name="l00005"></a><a class="code" href="classsq3_1_1log__db.html#a5de7c0cad428bed8f34eaa2f7c1b89ec">00005</a> <span class="preprocessor">#include <vector></span>
<a name="l00006"></a>00006 <span class="preprocessor">#include <cstdio></span> <span class="comment">// vsnprint()</span>
<a name="l00007"></a>00007 <span class="preprocessor">#include <cstring></span>
<a name="l00008"></a>00008 <span class="keyword">namespace </span>sq3 {
<a name="l00009"></a>00009
<a name="l00010"></a>00010 <a class="code" href="classsq3_1_1log__db.html#a5a013b51c7ebdba7ec6566755031a4c1" title="Creates an unopened database.">log_db::log_db</a>( std::string <span class="keyword">const</span> & filename )
<a name="l00011"></a><a class="code" href="classsq3_1_1log__db.html#ab27be97ae871b3c2ece7913403d13e9b">00011</a> : <a class="code" href="classsq3_1_1database.html" title="Encapsulates a connection to an sqlite database.">database</a>()
<a name="l00012"></a>00012 {
<a name="l00013"></a>00013 this-><a class="code" href="classsq3_1_1database.html#ab7b7609d8dfc4b773c72f80839c38572" title="Creates/opens the given db file.">database::open</a>(filename);
<a name="l00014"></a>00014 }
<a name="l00015"></a><a class="code" href="classsq3_1_1log__db.html#a1b654e2c000d3497f723848cd358f24e">00015</a>
<a name="l00016"></a>00016 <a class="code" href="classsq3_1_1log__db.html#ab27be97ae871b3c2ece7913403d13e9b" title="Closes this db.">log_db::~log_db</a>()
<a name="l00017"></a>00017 {
<a name="l00018"></a>00018 }
<a name="l00019"></a>00019
<a name="l00020"></a>00020 <span class="keywordtype">int</span> <a class="code" href="classsq3_1_1log__db.html#a1b654e2c000d3497f723848cd358f24e" title="Called when open() succeeds.">log_db::on_open</a>()
<a name="l00021"></a>00021 {
<a name="l00022"></a>00022 <span class="keywordflow">if</span>( ! this-><a class="code" href="classsq3_1_1database.html#af3b6b07c453a2ce5eaf9072e9cbe1f84" title="Returns true if this db is opened.">is_open</a>() )
<a name="l00023"></a>00023 {
<a name="l00024"></a>00024 <span class="keywordflow">return</span> SQLITE_ERROR;
<a name="l00025"></a>00025 }
<a name="l00026"></a>00026 std::string sql( <span class="stringliteral">"create table if not exists log(ts,msg TEXT)"</span> );
<a name="l00027"></a>00027 this-><a class="code" href="classsq3_1_1database.html#a65d5e801060b1dad34d539b191305130" title="Functionally identical to execute(char const *).">execute</a>( sql );<span class="comment"></span>
<a name="l00028"></a>00028 <span class="comment"> /**</span>
<a name="l00029"></a>00029 <span class="comment"> enable temp_store=MEMORY to speed this up considably on PocketPC</span>
<a name="l00030"></a>00030 <span class="comment"> devices writing to SD cards.</span>
<a name="l00031"></a><a class="code" href="classsq3_1_1log__db.html#af2c6103c4980d3ae24270c6ed618839d">00031</a> <span class="comment"> */</span>
<a name="l00032"></a>00032 this-><a class="code" href="classsq3_1_1database.html#ac9fda7f2a5e13df8a1e7cce2ecb13279" title="This is a convenience wrapper for execute( &quot;pragma ...&quot; ).">pragma</a>( <span class="stringliteral">"temp_store = MEMORY"</span> );
<a name="l00033"></a>00033 <span class="keywordflow">return</span> SQLITE_OK;
<a name="l00034"></a>00034 }
<a name="l00035"></a>00035
<a name="l00036"></a>00036 <span class="keywordtype">int</span> <a class="code" href="classsq3_1_1log__db.html#af2c6103c4980d3ae24270c6ed618839d" title="Empties the log database.">log_db::clear</a>()
<a name="l00037"></a>00037 {
<a name="l00038"></a>00038 <span class="keywordflow">return</span> this-><a class="code" href="classsq3_1_1database.html#a65d5e801060b1dad34d539b191305130" title="Functionally identical to execute(char const *).">execute</a>( <span class="stringliteral">"delete from log"</span> );
<a name="l00039"></a><a class="code" href="classsq3_1_1log__db.html#a95f7d7c504f6bd1cb1d438add7479de5">00039</a> }
<a name="l00040"></a>00040
<a name="l00041"></a>00041 <span class="keyword">static</span> <span class="keywordtype">char</span> <span class="keyword">const</span> * LOG_DB_LOG_INSERT_SQL = <span class="stringliteral">"insert into log (ts,msg) values(strftime('%Y-%m-%d %H:%M:%f','now'),?)"</span>;
<a name="l00042"></a>00042 <span class="comment">// "insert into log (ts,msg) values(current_timestamp,?)"</span>
<a name="l00043"></a>00043
<a name="l00044"></a>00044 <span class="keywordtype">bool</span> <a class="code" href="classsq3_1_1log__db.html#a95f7d7c504f6bd1cb1d438add7479de5" title="Logs a message to the log database.">log_db::log</a>( std::string <span class="keyword">const</span> & msg )
<a name="l00045"></a>00045 {
<a name="l00046"></a>00046 <span class="keywordflow">if</span>( ! this-><a class="code" href="classsq3_1_1database.html#af3b6b07c453a2ce5eaf9072e9cbe1f84" title="Returns true if this db is opened.">is_open</a>() )
<a name="l00047"></a>00047 {
<a name="l00048"></a>00048 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00049"></a>00049 }
<a name="l00050"></a>00050 <span class="keywordflow">if</span>( msg.empty() ) <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00051"></a>00051 statement st( *<span class="keyword">this</span>, LOG_DB_LOG_INSERT_SQL );
<a name="l00052"></a>00052 st.bind( 1, msg );
<a name="l00053"></a><a class="code" href="classsq3_1_1log__db.html#a400663fbeb21bbf919d3c1b944ec3613">00053</a> <span class="keywordtype">int</span> rc = st.execute();
<a name="l00054"></a>00054 <span class="keywordflow">return</span> <a class="code" href="namespacesq3.html#a080ee04ba6c41a38c4d3efbb1ccb741d" title="rc_is_okay() is an easy way to check if rc is one of SQLITE_OK, SQLITE_ROW, or SQLITE_DONE...">rc_is_okay</a>( rc );
<a name="l00055"></a>00055 <span class="comment">// In theory, if the count_changes PRAGMA is on then SQLITE_ROW will be returned from execute()</span>
<a name="l00056"></a>00056 }
<a name="l00057"></a>00057
<a name="l00058"></a>00058 <span class="keywordtype">bool</span> <a class="code" href="classsq3_1_1log__db.html#a95f7d7c504f6bd1cb1d438add7479de5" title="Logs a message to the log database.">log_db::log</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *format,...)
<a name="l00059"></a>00059 {
<a name="l00060"></a>00060 <span class="keywordflow">if</span>( ! this-><a class="code" href="classsq3_1_1database.html#af3b6b07c453a2ce5eaf9072e9cbe1f84" title="Returns true if this db is opened.">is_open</a>() )
<a name="l00061"></a>00061 {
<a name="l00062"></a>00062 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00063"></a>00063 }
<a name="l00064"></a>00064 <span class="keyword">const</span> <span class="keywordtype">int</span> buffsz = <span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>( std::max( (<span class="keywordtype">size_t</span>) 2048, strlen(format) * 2 ) );
<a name="l00065"></a>00065 std::vector<char> buffer( buffsz, <span class="charliteral">'\0'</span> );
<a name="l00066"></a>00066 va_list vargs;
<a name="l00067"></a>00067 va_start ( vargs, format );
<a name="l00068"></a>00068 <span class="keyword">using namespace </span>std;<span class="comment"></span>
<a name="l00069"></a>00069 <span class="comment"> /** In gcc, vsnprintf() is in the std namespace, but in MSVC it is not, so we use 'using'</span>
<a name="l00070"></a>00070 <span class="comment"> to accomodate both cases. */</span>
<a name="l00071"></a>00071 <span class="keywordtype">int</span> size = vsnprintf(&buffer[0], buffsz, format, vargs);
<a name="l00072"></a>00072 va_end( vargs );
<a name="l00073"></a>00073 <span class="keywordflow">if</span> (size > (buffsz-1))
<a name="l00074"></a>00074 {
<a name="l00075"></a>00075 <span class="comment">// replace tail of msg with "..."</span>
<a name="l00076"></a>00076 size = buffsz-1;
<a name="l00077"></a>00077 <span class="keywordflow">for</span>( <span class="keywordtype">int</span> i = buffsz-4; i < buffsz-1; ++i )
<a name="l00078"></a>00078 {
<a name="l00079"></a>00079 buffer[i] = <span class="charliteral">'.'</span>;
<a name="l00080"></a>00080 }
<a name="l00081"></a>00081 }
<a name="l00082"></a>00082 buffer[size] = <span class="charliteral">'\0'</span>;
<a name="l00083"></a>00083 <span class="keywordflow">if</span>( size )
<a name="l00084"></a>00084 {
<a name="l00085"></a>00085 statement st( *<span class="keyword">this</span>, LOG_DB_LOG_INSERT_SQL );
<a name="l00086"></a>00086 st.bind( 1, &buffer[0], size );
<a name="l00087"></a>00087 <span class="keywordtype">int</span> rc = st.execute();
<a name="l00088"></a>00088 <span class="comment">//std::cout << "FYI: rc from an INSERT is " << rc << '\n'; // == SQLITE_DONE</span>
<a name="l00089"></a>00089 <span class="keywordflow">return</span> SQLITE_DONE == rc;
<a name="l00090"></a>00090 }
<a name="l00091"></a><a class="code" href="classsq3_1_1log__db.html#adb4bc83fbe16ee98160631e55eb3ce2e">00091</a> <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00092"></a>00092 }
<a name="l00093"></a>00093
<a name="l00094"></a>00094 <span class="preprocessor">#undef LOG_DB_LOG_INSERT_SQL</span>
<a name="l00095"></a>00095 <span class="preprocessor"></span>
<a name="l00096"></a>00096 <span class="keywordtype">void</span> <a class="code" href="classsq3_1_1log__db.html#adb4bc83fbe16ee98160631e55eb3ce2e" title="Shows the last count entries using a subclass-specific method.">log_db::show_last</a>( <span class="keywordtype">int</span> count )
<a name="l00097"></a>00097 {
<a name="l00098"></a>00098 <span class="keywordflow">if</span>( ! this-><a class="code" href="classsq3_1_1database.html#af3b6b07c453a2ce5eaf9072e9cbe1f84" title="Returns true if this db is opened.">is_open</a>() )
<a name="l00099"></a>00099 {
<a name="l00100"></a>00100 <span class="keywordflow">return</span>;
<a name="l00101"></a>00101 }
<a name="l00102"></a>00102 std::ostream & os = std::cout;
<a name="l00103"></a>00103 os << <span class="stringliteral">"sq3::log_db: most recent "</span>
<a name="l00104"></a>00104 << count << <span class="stringliteral">" entries:\n"</span>;
<a name="l00105"></a>00105 <span class="keywordflow">if</span>( ! this-><a class="code" href="classsq3_1_1database.html#af3b6b07c453a2ce5eaf9072e9cbe1f84" title="Returns true if this db is opened.">is_open</a>() )
<a name="l00106"></a>00106 {
<a name="l00107"></a>00107 os << <span class="stringliteral">"ERROR: Log database is not opened!"</span>;
<a name="l00108"></a>00108 <span class="keywordflow">return</span>;
<a name="l00109"></a>00109 }
<a name="l00110"></a>00110 std::ostringstream fmt;
<a name="l00111"></a>00111 <span class="keywordflow">if</span>( 0 )
<a name="l00112"></a>00112 { <span class="comment">// newest entries at the top:</span>
<a name="l00113"></a>00113 fmt << <span class="stringliteral">"select /*DATETIME(ts)*/ts,msg from log "</span>
<a name="l00114"></a>00114 << <span class="stringliteral">"order by ts desc, rowid desc"</span>
<a name="l00115"></a>00115 <<<span class="stringliteral">" limit "</span> << count
<a name="l00116"></a>00116 ;
<a name="l00117"></a>00117 }
<a name="l00118"></a>00118 <span class="keywordflow">else</span>
<a name="l00119"></a>00119 { <span class="comment">// in "natural order":</span>
<a name="l00120"></a>00120 fmt << <span class="stringliteral">"select /*DATETIME(ts)*/ts,msg from log "</span>
<a name="l00121"></a>00121 << <span class="stringliteral">"order by ts asc, rowid asc"</span>
<a name="l00122"></a>00122 <<<span class="stringliteral">" limit "</span> << count
<a name="l00123"></a>00123 ;
<a name="l00124"></a>00124 }
<a name="l00125"></a>00125 std::string sql(fmt.str());
<a name="l00126"></a>00126 statement st( *<span class="keyword">this</span>, sql );
<a name="l00127"></a>00127 cursor r = st.get_cursor();
<a name="l00128"></a>00128 std::string buff;
<a name="l00129"></a>00129 <span class="keywordflow">while</span>( SQLITE_ROW == r.step() )
<a name="l00130"></a>00130 {
<a name="l00131"></a>00131 std::string tmp;
<a name="l00132"></a>00132 r.get( 0, tmp );
<a name="l00133"></a>00133 os << tmp << <span class="stringliteral">": "</span>;
<a name="l00134"></a><a class="code" href="classsq3_1_1log__db.html#a77bbc0cc808134c178417564a8da2006">00134</a> r.get( 1, tmp );
<a name="l00135"></a>00135 os << tmp << <span class="charliteral">'\n'</span>;
<a name="l00136"></a>00136 }
<a name="l00137"></a>00137 }
<a name="l00138"></a>00138
<a name="l00139"></a>00139 <span class="keywordtype">bool</span> <a class="code" href="classsq3_1_1log__db.html#a77bbc0cc808134c178417564a8da2006" title="Deletes all entries in the log except the leaveThisMany most recent.">log_db::trim</a>( <span class="keywordtype">int</span> count )
<a name="l00140"></a>00140 {
<a name="l00141"></a>00141 <span class="keywordflow">if</span>( this-><a class="code" href="classsq3_1_1database.html#af3b6b07c453a2ce5eaf9072e9cbe1f84" title="Returns true if this db is opened.">is_open</a>() )
<a name="l00142"></a>00142 {
<a name="l00143"></a>00143 std::ostringstream os;
<a name="l00144"></a>00144 os << <span class="stringliteral">"delete from log where rowid not in (select rowid from log order by ts desc, rowid desc limit "</span><<count<<<span class="stringliteral">")"</span>;
<a name="l00145"></a>00145 std::string sql( os.str() );
<a name="l00146"></a>00146 <span class="keywordflow">if</span>( SQLITE_OK == this-><a class="code" href="classsq3_1_1database.html#a65d5e801060b1dad34d539b191305130" title="Functionally identical to execute(char const *).">execute</a>( sql.c_str() ) )
<a name="l00147"></a>00147 {
<a name="l00148"></a>00148 this-><a class="code" href="classsq3_1_1database.html#a1cd1358658597f872f849691dafc12ed" title="Convenience wrapper around execute(&quot;vacuum&quot;).">vacuum</a>();
<a name="l00149"></a>00149 }
<a name="l00150"></a>00150 <span class="keywordflow">return</span> <span class="keyword">true</span>; <span class="comment">// delete will fail if the db is empty, but we'll consider that to be success</span>
<a name="l00151"></a>00151 }
<a name="l00152"></a>00152 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00153"></a>00153 }
<a name="l00154"></a>00154
<a name="l00155"></a>00155 } <span class="comment">// namespace</span>
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