如何在postgresql中生成自定义代码

CREATE OR REPLACE FUNCTION generate_crud_code(table_name text)
RETURNS text AS $$
DECLARE
    code text := '';
BEGIN
    -- 生成查询代码
    code := code || 'SELECT * FROM ' || table_name || ';';

    -- 生成插入代码
    code := code || E'\n\nINSERT INTO ' || table_name || ' (column1, column2) VALUES (value1, value2);';

    -- 生成更新代码
    code := code || E'\n\nUPDATE ' || table_name || ' SET column1 = new_value WHERE condition;';

    -- 生成删除代码
    code := code || E'\n\nDELETE FROM ' || table_name || ' WHERE condition;';

    RETURN code;
END;
$$ LANGUAGE plpgsql;