On 19/05/2009 1:42 AM, Christopher Taylor wrote:
> I took a slightly different approach and used a trigger. This is the create
> table function from my event log class. The string handler is proprietary
> but other than that there should be enough there to give you an idea.
>
> void DbEventLog::CreateTable(sqlite3* pDatabase)
> {
> // create the table and insert the record
> char* db_err;
> CmnNarrowString createQuery = "create table tbl_EventLog (";
> createQuery += "m_key integer primary key autoincrement, ";
> createQuery += "m_eventCode integer, ";
> createQuery += "m_timestamp integer, ";
Are you sure about that comma?
C:\junk>sqlite3
SQLite version 3.6.14
Enter ".help" for instructions
Enter SQL statements terminated with a ";"
sqlite> create table foo(col0, col1, col2,);
SQL error: near ")": syntax error
sqlite>
> createQuery += ");";
> int rc = sqlite3_exec(pDatabase, createQuery.c_str(), NULL, 0, &db_err);
> if ( rc != SQLITE_OK )
> {
> // TODO - log error
> }
> else
> {
> // create the index on the unique id used for queries from ics
> createQuery = "create index idx_EventLog on tbl_EventLog (m_key)";
> rc = sqlite3_exec(pDatabase, createQuery.c_str(), NULL, 0, &db_err);
> if ( rc != SQLITE_OK )
> {
> // TODO - log error
> }
> else
> {
> createQuery = "create trigger trg_EventLog after insert on
> tbl_EventLog begin delete from tbl_EventLog where m_key <= (SELECT
> max(m_key) FROM tbl_EventLog) - 4000; end;";
> rc = sqlite3_exec(pDatabase, createQuery.c_str(), NULL, 0,
> &db_err);
> if ( rc != SQLITE_OK )
> {
> // TODO - log the error
> }
> }
> }
> }
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>
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