Move qlite into libdino

1 files changed, 103 insertions, 0 deletions

diff --git a/libdino/src/qlite/update_builder.vala b/libdino/src/qlite/update_builder.vala
new file mode 100644
index 00000000..d371a93a
--- /dev/null
+++ b/libdino/src/qlite/update_builder.vala
@@ -0,0 +1,103 @@
+using Sqlite;
+
+namespace Dino.Qlite {
+
+public class UpdateBuilder : StatementBuilder {
+
+    // UPDATE [OR ...]
+    private string? or_val;
+
+    // [...]
+    private Table? table;
+    private string table_name;
+
+    // SET [...]
+    private StatementBuilder.AbstractField[] fields = {};
+
+    // WHERE [...]
+    private string selection = "1";
+    private StatementBuilder.AbstractField[] selection_args = {};
+
+    internal UpdateBuilder(Database db, Table table) {
+        base(db);
+        this.table = table;
+        this.table_name = table.name;
+    }
+
+    internal UpdateBuilder.for_name(Database db, string table) {
+        base(db);
+        this.table_name = table;
+    }
+
+    public UpdateBuilder or(string or) {
+        this.or_val = or;
+        return this;
+    }
+
+    public UpdateBuilder set<T>(Column<T> column, T value) {
+        fields += new Field<T>(column, value);
+        return this;
+    }
+
+    public UpdateBuilder set_null<T>(Column<T> column) {
+        if (column.not_null) error("Can't set non-null column %s to null", column.name);
+        fields += new NullField<T>(column);
+        return this;
+    }
+
+    public UpdateBuilder where(string selection, string[] selection_args = {}) {
+        if (this.selection != "1") error("selection was already done, but where() was called.");
+        this.selection = selection;
+        foreach (string arg in selection_args) {
+            this.selection_args += new StatementBuilder.StringField(arg);
+        }
+        return this;
+    }
+
+    public UpdateBuilder with<T>(Column<T> column, string comp, T value) {
+        selection_args += new Field<T>(column, value);
+        selection = @"($selection) AND $(column.name) $comp ?";
+        return this;
+    }
+
+    public UpdateBuilder with_null<T>(Column<T> column) {
+        selection = @"($selection) AND $(column.name) ISNULL";
+        return this;
+    }
+
+    public UpdateBuilder without_null<T>(Column<T> column) {
+        selection = @"($selection) AND $(column.name) NOT NULL";
+        return this;
+    }
+
+    internal override Statement prepare() {
+        string sql = "UPDATE";
+        if (or_val != null) sql += @" OR $((!)or_val)";
+        sql += @" $table_name SET ";
+        for (int i = 0; i < fields.length; i++) {
+            if (i != 0) {
+                sql += ", ";
+            }
+            sql += @"$(((!)fields[i].column).name) = ?";
+        }
+        sql += @" WHERE $selection";
+        Statement stmt = db.prepare(sql);
+        for (int i = 0; i < fields.length; i++) {
+            fields[i].bind(stmt, i+1);
+        }
+        for (int i = 0; i < selection_args.length; i++) {
+            selection_args[i].bind(stmt, i + fields.length + 1);
+        }
+        return stmt;
+    }
+
+    public void perform() {
+        if (fields.length == 0) return;
+        if (prepare().step() != DONE) {
+            critical("SQLite error: %d - %s", db.errcode(), db.errmsg());
+        }
+    }
+
+}
+
+}