Difference between revisions of "SQLQueryEx"
From SCAR Divi Manual
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Revision as of 09:34, 10 February 2012
Definition
function SQLQueryEx(const DBIndex: Integer; const Query: string): Integer;
Availability
SCAR Divi 3.31 > Current
Description
Creates a new SQLite3 query statement Query for the database given by DBIndex. The function returns an index to the query statement in the system. To execute the query, you have to call SQLQueryStep, it may be required to bind parameters to the query first. You can add parameters with the "?" sign, then fill them out later using SQLBindX methods, the parameters are offset at index 1 rather than 0. An example would be "SELECT * FROM table WHERE id = ?", you would then use SQLBindInt to fill out the integer id parameter at index 1. After you've executed the query, you can bind new parameters and execute it again by calling SQLQueryReset first.
Example
var
DB, Query, InsertID: Integer;
begin
DB := SQLOpen(WorkspacePath + 'test.db3', True);
try
// Create a table
SQLQuery(DB, 'CREATE TABLE IF NOT EXISTS test(id INTEGER PRIMARY KEY, string TEXT)');
// Insert 2 rows into the table
Query := SQLQueryEx(DB, 'INSERT INTO test VALUES(NULL, ?)');
try
SQLBindStr(Query, 1, 'Hello Mars!');
SQLQueryStep(Query);
SQLQueryReset(Query);
SQLBindStr(Query, 1, 'Hello World!');
SQLQueryStep(Query);
InsertID := SQLLastID(DB);
finally
SQLQueryFree(Query);
end;
// Get the data stored in the last row
Query := SQLQueryEx(DB, 'SELECT * FROM test WHERE id = ?');
try
SQLBindInt(Query, 1, InsertID);
if SQLQueryStep(Query) = SQL_ROW then
WriteLn(SQLColumnStr(Query, 1));
finally
SQLQueryFree(Query);
end;
finally
SQLFree(DB);
end;
end.Output:
Hello World!
