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using Sqlite;
namespace 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) throws DatabaseError {
if (column.not_null) throw new DatabaseError.ILLEGAL_QUERY(@"Can't set non-null column $(column.name) to null");
fields += new NullField<T>(column);
return this;
}
public UpdateBuilder where(string selection, string[] selection_args = {}) throws DatabaseError {
if (this.selection != "1") throw new DatabaseError.ILLEGAL_QUERY("selection was already done, but where() was called.");
this.selection = selection;
foreach (string arg in selection_args) {
this.selection_args += new StatementBuilder.StringField(arg);
}
return this;
}
public UpdateBuilder with<T>(Column<T> column, string comp, T value) {
selection_args += new Field<T>(column, value);
selection = @"($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() throws DatabaseError {
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() throws DatabaseError {
if (fields.length == 0) return;
if (prepare().step() != DONE) {
throw new DatabaseError.EXEC_ERROR(@"SQLite error: $(db.errcode()) - $(db.errmsg())");
}
}
}
}
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