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An enhanced toolkit of Mybatis to simplify development.

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/**
 * Copyright (c) 2011-2020, hubin ([email protected]).
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 

 * http://www.apache.org/licenses/LICENSE-2.0
 * 

 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.baomidou.mybatisplus.generator.config.querys;

import com.baomidou.mybatisplus.generator.config.rules.DbType;

/**
 * 

 * Oracle 表数据查询
 * 
 *
 * @author hubin
 * @since 2018-01-16
 */
public class OracleQuery extends AbstractDbQuery {


    @Override
    public DbType dbType() {
        return DbType.ORACLE;
    }


    @Override
    public String tablesSql() {
        return "SELECT * FROM USER_TAB_COMMENTS";
    }


    @Override
    public String tableFieldsSql() {
        return "SELECT A.COLUMN_NAME, CASE WHEN A.DATA_TYPE='NUMBER' THEN "
            + "(CASE WHEN A.DATA_PRECISION IS NULL THEN A.DATA_TYPE "
            + "WHEN NVL(A.DATA_SCALE, 0) > 0 THEN A.DATA_TYPE||'('||A.DATA_PRECISION||','||A.DATA_SCALE||')' "
            + "ELSE A.DATA_TYPE||'('||A.DATA_PRECISION||')' END) "
            + "ELSE A.DATA_TYPE END DATA_TYPE, B.COMMENTS,DECODE(C.POSITION, '1', 'PRI') KEY "
            + "FROM USER_TAB_COLUMNS A INNER JOIN USER_COL_COMMENTS B ON A.TABLE_NAME = B.TABLE_NAME"
            + " AND A.COLUMN_NAME = B.COLUMN_NAME LEFT JOIN USER_CONSTRAINTS D "
            + "ON D.TABLE_NAME = A.TABLE_NAME AND D.CONSTRAINT_TYPE = 'P' "
            + "LEFT JOIN USER_CONS_COLUMNS C ON C.CONSTRAINT_NAME = D.CONSTRAINT_NAME "
            + "AND C.COLUMN_NAME=A.COLUMN_NAME WHERE A.TABLE_NAME = '%s' ORDER BY A.COLUMN_ID ";
    }


    @Override
    public String tableName() {
        return "TABLE_NAME";
    }


    @Override
    public String tableComment() {
        return "COMMENTS";
    }


    @Override
    public String fieldName() {
        return "COLUMN_NAME";
    }


    @Override
    public String fieldType() {
        return "DATA_TYPE";
    }


    @Override
    public String fieldComment() {
        return "COMMENTS";
    }


    @Override
    public String fieldKey() {
        return "KEY";
    }

}