mybatis按照关键字(符号)截取字符串,字符串拼接,循环查询语句,分组求和函数用法
2018-02-26 14:20
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SQL语句1、按照关键字(符号)截取字符串,2、取集合参数某下标值,3、字符串拼接,4、循环查询语句,5、分组求和函数用法:<select id="getSettleTableDetail" parameterType="map" resultType="map">
SELECT SUM( ad.HOT_NUM) AS hotNum , SUM(ad.EXPOSURE_NUM) AS exposureNum , SUM(ad.DOWNLOAD_NUM) AS downloadNum, SUBSTRING_INDEX( ade.CREATED_DATE,' ',1) AS createTime FROM ADS_ADVERTISEMENT ad LEFT JOIN ADS_ADVERTISEMENT_EXPOSURE ade ON ad.ADVERTISEMENT_ID=ade.ADVERTISEMENT_ID WHERE ad.ADVERTISEMENT_ID=#{advertisementId} <if test="list != null "> and ade.CREATED_DATE LIKE concat(#{list[0]},'%') <foreach item="item" collection="list" open="" close="" index="1"> or ade.CREATED_DATE LIKE concat(#{item},'%') </foreach> </if> GROUP BY createTime //group by是根据别名来分组的。
</select>
sql截取字符串用法:left(被截取字段,截取长度);
right(被截取字段,截取长度);
substring(被截取字段,从第几位开始截取);
substring(被截取字段,从第几位开始截取,截取长度);
substring_index(被截取字段,关键字,关键字出现的次数);
mysql查询最后一条插入的ID:适用int类型:SELECT LAST_INSERT_ID() ;
SELECT MAX(id) FROM table
String sql = "INSERT INTO users (username,password,email) VALUES (?,?,?);"; PreparedStatement pstmt = (PreparedStatement) conn.prepareStatement(sql,Statement.RETURN_GENERATED_KEYS);//传入参数:Statement.RETURN_GENERATED_KEYS
pstmt.setString(1, user.getUsername());
pstmt.setString(2, user.getPassword());
pstmt.setString(3, user.getEmail());
pstmt.executeUpdate();//执行sql int autoInckey = -1;
ResultSet rs = pstmt.getGeneratedKeys(); //获取结果
if (rs.next()) {
autoIncKey = rs.getInt(1);//取得ID
} else {
// throw an exception from here
}
SELECT SUM( ad.HOT_NUM) AS hotNum , SUM(ad.EXPOSURE_NUM) AS exposureNum , SUM(ad.DOWNLOAD_NUM) AS downloadNum, SUBSTRING_INDEX( ade.CREATED_DATE,' ',1) AS createTime FROM ADS_ADVERTISEMENT ad LEFT JOIN ADS_ADVERTISEMENT_EXPOSURE ade ON ad.ADVERTISEMENT_ID=ade.ADVERTISEMENT_ID WHERE ad.ADVERTISEMENT_ID=#{advertisementId} <if test="list != null "> and ade.CREATED_DATE LIKE concat(#{list[0]},'%') <foreach item="item" collection="list" open="" close="" index="1"> or ade.CREATED_DATE LIKE concat(#{item},'%') </foreach> </if> GROUP BY createTime //group by是根据别名来分组的。
</select>
sql截取字符串用法:left(被截取字段,截取长度);
right(被截取字段,截取长度);
substring(被截取字段,从第几位开始截取);
substring(被截取字段,从第几位开始截取,截取长度);
substring_index(被截取字段,关键字,关键字出现的次数);
mysql查询最后一条插入的ID:适用int类型:SELECT LAST_INSERT_ID() ;
SELECT MAX(id) FROM table
String sql = "INSERT INTO users (username,password,email) VALUES (?,?,?);"; PreparedStatement pstmt = (PreparedStatement) conn.prepareStatement(sql,Statement.RETURN_GENERATED_KEYS);//传入参数:Statement.RETURN_GENERATED_KEYS
pstmt.setString(1, user.getUsername());
pstmt.setString(2, user.getPassword());
pstmt.setString(3, user.getEmail());
pstmt.executeUpdate();//执行sql int autoInckey = -1;
ResultSet rs = pstmt.getGeneratedKeys(); //获取结果
if (rs.next()) {
autoIncKey = rs.getInt(1);//取得ID
} else {
// throw an exception from here
}
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