add_columns

根据条件为某数据库下的某些业务表添加更新日期字段，以下代码适用于Highgo数据库，逻辑可以迁移

CREATE OR REPLACE FUNCTION add_common_columns()
RETURNS void
LANGUAGE plpgsql
AS $$
DECLARE
    tbl record;
BEGIN
    FOR tbl IN 
        SELECT 
            t.table_schema,  -- 添加schema名
            t.table_name
        FROM 
            information_schema.tables t
        WHERE upper(table_schema) LIKE upper('wf%')  
          --  t.table_schema NOT IN ('pg_catalog', 'information_schema')
            AND t.table_type = 'BASE TABLE'
            AND NOT EXISTS (
                SELECT 1 
                FROM information_schema.columns c 
                WHERE c.table_schema = t.table_schema  -- 添加schema条件
                AND c.table_name = t.table_name 
                AND c.column_name = 'updatetimecol'
            )
            AND NOT EXISTS (
                SELECT 1 
                FROM information_schema.columns c 
                WHERE c.table_schema = t.table_schema  -- 添加schema条件
                AND c.table_name = t.table_name 
                AND c.column_name = 'inspurflag'
            )
    LOOP
        -- 使用schema限定的表名
        EXECUTE format('ALTER TABLE %I.%I ADD COLUMN updatetimecol TIMESTAMP DEFAULT CURRENT_TIMESTAMP', 
                      tbl.table_schema, tbl.table_name);
        EXECUTE format('ALTER TABLE %I.%I ADD COLUMN inspurflag bpchar(1) DEFAULT ''0''', 
                      tbl.table_schema, tbl.table_name);
        RAISE NOTICE '已为表 %.% 添加 updatetimecol 和 inspurflag 字段', tbl.table_schema, tbl.table_name;
    END LOOP;
END;
$$;

-- 调用函数
SELECT add_common_columns();