public static RowData QuerySingle(this sqlite3 db, Query query)
{
var stmt = db.Prepare(query);
try {
for (var i = 0; i < query.Parameters.Count; i++)
{
stmt.BindParameter(query.Parameters[i], i + 1);
}
var result = SQLite.sqlite3_step(stmt);
if (result == StepResult.Row)
{
return(new RowData(stmt, true));
}
if (result == StepResult.Done)
{
return(null);
}
var err = SQLite.sqlite3_errmsg(db);
throw new SQLiteException(err);
}
finally {
stmt.Finalize();
}
}
public static void Execute(this sqlite3 db, Query query)
{
if (query.Parameters == null || query.Parameters.Count == 0)
{
//Parameter less execute
var result = SQLite.sqlite3_exec(db, query.Command);
if (result != Error.OK)
{
var err = SQLite.sqlite3_errmsg(db);
throw new SQLiteException(err);
}
}
else
{
//With parameters to bind
var stmt = db.Prepare(query);
try {
for (var i = 0; i < query.Parameters.Count; i++)
{
stmt.BindParameter(query.Parameters[i], i + 1);
}
var result = SQLite.sqlite3_step(stmt);
if (result != StepResult.Done && result != StepResult.Row)
{
var err = SQLite.sqlite3_errmsg(db);
throw new SQLiteException(err);
}
}
finally {
stmt.Finalize();
}
}
}
public static void QueryReader(this sqlite3 db, Query query, Action <RowData> onRow)
{
var stmt = db.Prepare(query);
try {
for (var i = 0; i < query.Parameters.Count; i++)
{
stmt.BindParameter(query.Parameters[i], i + 1);
}
RowData row = null;
while (true)
{
var stepResult = SQLite.sqlite3_step(stmt);
if (stepResult != StepResult.Row)
{
break;
}
if (row == null)
{
row = new RowData(stmt);
}
else
{
row.ClearForNewRow();
}
onRow?.Invoke(row);
}
}
finally {
stmt.Finalize();
}
}
public static void AddColumnIfNotExists(this sqlite3 db, string table, string column, string type)
{
var exists = TableColumnExists(db, table, column);
if (exists)
{
return;
}
var query = $"ALTER TABLE {table} ADD COLUMN {column} {type}";
var stmt = db.Prepare(query);
try {
var result = SQLite.sqlite3_step(stmt);
if (result != StepResult.Done)
{
var err = SQLite.sqlite3_errmsg(db);
throw new SQLiteException("Cannot add column: " + err);
}
}
finally {
stmt?.Finalize();
}
}
