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using Sqlite;
namespace Qlite {
public class UpsertBuilder : StatementBuilder {
// INTO [...]
private Table table;
private string table_name;
// VALUES [...]
private StatementBuilder.AbstractField[] keys = {};
private StatementBuilder.AbstractField[] fields = {};
internal UpsertBuilder(Database db, Table table) {
base(db);
this.table = table;
this.table_name = table.name;
}
public UpsertBuilder value<T>(Column<T> column, T value, bool key = false) {
if (key) {
keys += new Field<T>(column, value);
} else {
fields += new Field<T>(column, value);
}
return this;
}
public UpsertBuilder value_null<T>(Column<T> column) throws DatabaseError {
if (column.not_null) throw new DatabaseError.ILLEGAL_QUERY(@"Can't set non-null column $(column.name) to null");
fields += new NullField<T>(column);
return this;
}
internal override Statement prepare() throws DatabaseError {
throw new DatabaseError.NOT_SUPPORTED("prepare() not available for upsert.");
}
internal Statement prepare_update() {
string update_set_list = "";
string update_where_list = "";
for (int i = 0; i < fields.length; i++) {
if (i != 0) {
update_set_list += ", ";
}
update_set_list += @"$(((!)fields[i].column).name) = ?";
}
for (int i = 0; i < keys.length; i++) {
if (i != 0) {
update_where_list += " AND ";
}
update_where_list += @"$(((!)keys[i].column).name) = ?";
}
string sql = @"UPDATE $table_name SET $update_set_list WHERE $update_where_list";
Statement stmt = db.prepare(sql);
for (int i = 0; i < fields.length; i++) {
fields[i].bind(stmt, i + 1);
}
for (int i = 0; i < keys.length; i++) {
keys[i].bind(stmt, i + fields.length + 1);
}
return stmt;
}
internal Statement prepare_insert() {
string insert_field_list = "";
string insert_value_qs = "";
for (int i = 0; i < fields.length; i++) {
if (i != 0) {
insert_value_qs += ", ";
insert_field_list += ", ";
}
insert_field_list += ((!)fields[i].column).name;
insert_value_qs += "?";
}
for (int i = 0; i < keys.length; i++) {
if (i != 0 || fields.length > 0) {
insert_value_qs += ", ";
insert_field_list += ", ";
}
insert_field_list += ((!)keys[i].column).name;
insert_value_qs += "?";
}
string sql = @"INSERT OR IGNORE INTO $table_name ($insert_field_list) VALUES ($insert_value_qs)";
Statement stmt = db.prepare(sql);
for (int i = 0; i < fields.length; i++) {
fields[i].bind(stmt, i + 1);
}
for (int i = 0; i < keys.length; i++) {
keys[i].bind(stmt, i + fields.length + 1);
}
return stmt;
}
public int64 perform() throws DatabaseError {
if (prepare_update().step() != DONE || prepare_insert().step() != DONE) {
throw new DatabaseError.EXEC_ERROR(@"SQLite error: $(db.errcode()) - $(db.errmsg())");
}
return db.last_insert_rowid();
}
}
}
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