java.lang.Integer cannot be cast to java.lang.Double是类型转换出现的错误,当是这个数据在前端明明处理过,使用parseFloat转为了浮点数 后端使用List<List>进行接收,此时也没有报错 于是打开debug进行调试检查问题,发现传过来的数值如果是整数则为Integer类型,有小数的才是double类型 但是在接收后
因此会报错：java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String。
publicList<Map<String, String>>getSet(String sql){ List<Map<String, String>> list =newArrayList<Map<String,String>>(); ResultSet rs=null; Statement sm=null;try{//1.加载驱动程序Class.forName(driver); con=DriverManager.getConnection(url, user, passwod);//2.创建statement类对象,用来执行SQL语句!
(TIMESTAMP'2022-02-01 00:00:00' AS SMALLINT); error: overflow > SELECT cast(true AS BOOLEAN); 1 > SELECT cast(INTERVAL '1-2' YEAR TO MONTH AS INTEGER); 14 > SELECT cast(INTERVAL '1:30.5' MINUTE TO SECOND AS DECIMAL(5, 2)); 90.50 > SELECT cast(TRUE AS INT); 1 > SELECT ...
SELECT CAST({fn PI()} As INTEGER) As IntegerPi, CAST({fn PI()} As SMALLINT) As SmallIntPi, CAST({fn PI()} As DECIMAL) As DecimalPi, CAST({fn PI()} As NUMERIC) As NumericPi, CAST({fn PI()} As DOUBLE) As DoublePi 注意,在下面的例子中,精度和比例值被解析,但不会改变CAST返...
This includes xml, bigint, and sql_variant. Alias data types can't be used.lengthAn optional integer that specifies the length of the target data type, for data types that allow a user specified length. The default value is 30.style...
执行这段代码最后一句报错:java.lang.Integer cannot be cast to java.lang.String,当时真的很奇怪,但是后来一步一步检查,终于发现在第三步的时候有问题,其实动动脑子也不难发现,只有第三步出错的可能性是最大的。 还是要测试啊,特别是使用自己没有使用过和不知道内在原理的东西。
In Example 1, we use the CAST function to convert the Score column from type FLOAT to INTEGER. When we do this, different RDMBS have different rules on how to handle the numbers after the decimal point. In the above example, the numbers after the decimal point are always truncated. ...
SELECT CAST(true AS integer) FROM << 0 >> -- 1 SELECT CAST('2001-01-01T' AS timestamp) FROM << 0 >> -- 2001-01-01T SELECT CAST('xx' AS symbol) FROM << 0 >> -- xx SELECT CAST(42 AS string) FROM << 0 >> -- "42" 相關函數 TO_STRING TO_TIMESTAMP 下一個主題...
This example casts a numeric value to an integer. Copy (DT_I4) 3.57 This example casts an integer to a character string using the 1252 code page. Copy (DT_STR,1,1252)5 This example casts a three-character string to double-byte characters. Copy (DT_WSTR,3)"Cat" This example...