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-rw-r--r--qlite/src/upsert_builder.vala110
1 files changed, 110 insertions, 0 deletions
diff --git a/qlite/src/upsert_builder.vala b/qlite/src/upsert_builder.vala
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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();
+ }
+
+}
+
+} \ No newline at end of file