Mybatis的动态创建删除表

Posted 2023-03-03 量变决定质变

Mybatis中可以使用JSTL标签

动态删除表

Mapper

void deleteTable(@Param("tableName") String tableName);

Mapper.xml

<update id="deleteTable">
    DROP TABLE $tableName
</update>

动态创建表

Mapper

void createTable(@Param("newTableName") String newTableName, @Param("columns") List<Map<String, String>> columns);

Mapper.xml

<update id="createTable">
    CREATE TABLE $newTableName (
    "ID" VARCHAR2(64 BYTE) PRIMARY KEY NOT NULL,
    <foreach item="item" index="index" collection="columns" open="" separator="," close=",">
        "$item.code"
        <choose>
            <when test="item.type=='STRING'">
                VARCHAR2($item.length BYTE) NULL
            </when>
            <when test="item.type=='NUMBER'">
                NUMBER($item.length，$column.precision) NULL
            </when>
            <otherwise>
                TIMESTAMP($item.length) NULL
            </otherwise>
        </choose>
    </foreach>
    "CREATE_TIME" TIMESTAMP(6) NULL ,
    "MODIFY_TIME" TIMESTAMP(6) NULL
    )
</update>

或者

Mapper

void createTableColumn(@Param("newTableName") String newTableName, @Param("column") Map<String, String> column);

Mapper.xml

<update id="createTableColumn" parameterType="java.util.Map">
    CREATE TABLE $newTableName (
    "ID" VARCHAR2(64 BYTE) PRIMARY KEY NOT NULL,
    "CREATE_TIME" TIMESTAMP(6) NULL ,
    "MODIFY_TIME" TIMESTAMP(6) NULL ,
    "$column.code"
    <choose>
        <when test="column.type=='STRING'">
            VARCHAR2($column.length BYTE) NULL
        </when>
        <when test="column.type=='NUMBER'">
            NUMBER($column.length,$column.precision) NULL
        </when>
        <otherwise>
            TIMESTAMP($column.length) NULL
        </otherwise>
    </choose>
    )
</update>