<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.ruoyi.generator.mapper.GenTableColumnMapper">

    <resultMap type="com.ruoyi.generator.domain.GenTableColumn" id="GenTableColumnResult">
    </resultMap>

    <select id="selectDbTableColumnsByName" parameterType="String" resultMap="GenTableColumnResult">
        <if test="@com.ruoyi.common.mybatis.helper.DataBaseHelper@isMySql()">
            select column_name,
                   (case when (is_nullable = 'no' <![CDATA[ && ]]> column_key != 'PRI') then '1' else null end) as is_required,
                   (case when column_key = 'PRI' then '1' else '0' end) as is_pk,
                   ordinal_position as sort,
                   column_comment,
                   (case when extra = 'auto_increment' then '1' else '0' end) as is_increment,
                   column_type
            from information_schema.columns where table_schema = (select database()) and table_name = (#{tableName})
            order by ordinal_position
        </if>
        <if test="@com.ruoyi.common.mybatis.helper.DataBaseHelper@isOracle()">
            select lower(temp.column_name) as column_name,
                    (case when (temp.nullable = 'N'  and  temp.constraint_type != 'P') then '1' else null end) as is_required,
                    (case when temp.constraint_type = 'P' then '1' else '0' end) as is_pk,
                    temp.column_id as sort,
                    temp.comments as column_comment,
                    (case when temp.constraint_type = 'P' then '1' else '0' end) as is_increment,
                    lower(temp.data_type) as column_type
            from (
                select col.column_id, col.column_name,col.nullable, col.data_type, colc.comments, uc.constraint_type, row_number()
                    over (partition by col.column_name order by uc.constraint_type desc) as row_flg
                from user_tab_columns col
                left join user_col_comments colc on colc.table_name = col.table_name and colc.column_name = col.column_name
                left join user_cons_columns ucc on ucc.table_name = col.table_name and ucc.column_name = col.column_name
                left join user_constraints uc on uc.constraint_name = ucc.constraint_name
                where col.table_name = upper(#{tableName})
            ) temp
            WHERE temp.row_flg = 1
            ORDER BY temp.column_id
        </if>
        <if test="@com.ruoyi.common.mybatis.helper.DataBaseHelper@isPostgerSql()">
            SELECT column_name, is_required, is_pk, sort, column_comment, is_increment, column_type
            FROM (
                SELECT c.relname AS table_name,
                       a.attname AS column_name,
                       d.description AS column_comment,
                       CASE WHEN a.attnotnull AND con.conname IS NULL THEN 1 ELSE 0
                       END AS is_required,
                       CASE WHEN con.conname IS NOT NULL THEN 1 ELSE 0
                       END AS is_pk,
                       a.attnum AS sort,
                       CASE WHEN "position"(pg_get_expr(ad.adbin, ad.adrelid),
                           ((c.relname::text || '_'::text) || a.attname::text) || '_seq'::text) > 0 THEN 1 ELSE 0
                       END AS is_increment,
                       btrim(
                           CASE WHEN t.typelem <![CDATA[ <> ]]> 0::oid AND t.typlen = '-1'::integer THEN 'ARRAY'::text ELSE
                                CASE WHEN t.typtype = 'd'::"char" THEN format_type(t.typbasetype, NULL::integer)
                                ELSE format_type(a.atttypid, NULL::integer) END
                           END, '"'::text
                       ) AS column_type
                FROM pg_attribute a
                    JOIN (pg_class c JOIN pg_namespace n ON c.relnamespace = n.oid) ON a.attrelid = c.oid
                    LEFT JOIN pg_description d ON d.objoid = c.oid AND a.attnum = d.objsubid
                    LEFT JOIN pg_constraint con ON con.conrelid = c.oid AND (a.attnum = ANY (con.conkey))
                    LEFT JOIN pg_attrdef ad ON a.attrelid = ad.adrelid AND a.attnum = ad.adnum
                    LEFT JOIN pg_type t ON a.atttypid = t.oid
                WHERE (c.relkind = ANY (ARRAY ['r'::"char", 'p'::"char"]))
                    AND a.attnum > 0
                    AND n.nspname = 'public'::name
                ORDER BY c.relname, a.attnum
            ) temp
            WHERE table_name = (#{tableName})
                AND column_type <![CDATA[ <> ]]> '-'
        </if>
        <if test="@com.ruoyi.common.mybatis.helper.DataBaseHelper@isSqlServer()">
            SELECT
                cast(A.NAME as nvarchar) as column_name,
                cast(B.NAME as nvarchar) + (case when B.NAME = 'numeric' then '(' + cast(A.prec as nvarchar) + ',' + cast(A.scale as nvarchar) + ')' else '' end) as column_type,
                cast(G.[VALUE] as nvarchar) as column_comment,
                (SELECT 1 FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE Z WHERE TABLE_NAME = D.NAME and A.NAME = Z.column_name  ) as is_pk,
                colorder as sort
            FROM SYSCOLUMNS A
                LEFT JOIN SYSTYPES B ON A.XTYPE = B.XUSERTYPE
                INNER JOIN SYSOBJECTS D ON A.ID = D.ID AND D.XTYPE='U' AND D.NAME != 'DTPROPERTIES'
                LEFT JOIN SYS.EXTENDED_PROPERTIES G ON A.ID = G.MAJOR_ID AND A.COLID = G.MINOR_ID
                LEFT JOIN SYS.EXTENDED_PROPERTIES F ON D.ID = F.MAJOR_ID AND F.MINOR_ID = 0
            WHERE D.NAME = #{tableName}
            ORDER BY A.COLORDER
        </if>
    </select>

</mapper>
