1.int装string select CAST (1234 AS text) selectto_char(1234,’999‘) 2.string转int selectcast('999'as NUMERIC) --5 附: PostgreSQL 类型转换函数
1.int装string select CAST (1234 AS text) selectto_char(1234,’999‘) 2.string转int selectcast('999'as NUMERIC) --5 附: PostgreSQL 类型转换函数
cmd.Parameters.AddWithValue("@fromID", 1); cmd.Parameters.AddWithValue("@toID", 2); cmd.Parameters.AddWithValue("@momeys",Convert.ToInt32( TextBox1.Text) ); cmd.Parameters.Add("@return", "").Direction = ParameterDirection.ReturnValue;//获取存储过程的返回值 cmd.ExecuteNonQuery(); string val...
public DataTable GetList(string tbName, string tbGetFields, string OrderFldName, int PageSize, int PageIndex, string strWhere, ref int TotalCount) { DataSet ds = dal.GetList(tbName, tbGetFields, OrderFldName, PageSize, PageIndex, strWhere); TotalCount = Convert.ToInt32(ds.Tables[1].Rows...
While working with PostgreSQL, we may encounter a situation where we need to convert one data type into another. For instance, converting a numeric string into an int, a string to date, etc. For this purpose, PostgreSQL provides a CAST operator that assists us in converting one data type ...
...在Python中将字符串转换为整数的错误方法 (The Wrong Way to Convert a String to an Integer in Python) Programmers coming...在这里, TypeError: must be str, not int ,该整数必须先转换为字符串才能连接。 ...在Python中将字符串转换为整数的正确方法 (The Correct Way to Convert a String to an...
PostgreSQL BIT_TO_NUM PostgreSQL的bit转换为整型有隐式的转换,与显示的转换。 固定长度的bit到整型是可以使用隐式转换的,而varbit到整型则需要显示转换。 隐式转换例子 postgres=# select '1010'::bit(4)::int; int4 --- 10 (1 row) postgres=# select '1010'::varbit::int; ERROR: cannot cast typ...
-- 创建函数1 smallint到boolean到转换函数CREATE OR REPLACE FUNCTION "smallint_to_boolean"("i" int2)RETURNS "pg_catalog"."bool" AS $BODY$BEGINRETURN (i::int2)::integer::bool;END;$BODY$LANGUAGE plpgsql VOLATILE-- 创建赋值转换1create cast (SMALLINT as BOOLEAN) with function smallint_to_...
convert(string using conversion_name) text 使用指定的转换名字改变编码。 convert('PostgreSQL' using iso_8859_1_to_utf8) 'PostgreSQL' lower(string) text 把字串转化为小写 lower('TOM') tom octet_length(string) int 字串中的字节数 octet_length('jose') 4 overlay(string placing string from int ...
postgres=# drop table t_ret; DROP TABLE postgres=# create table t_ret(id int, info text, crt_time timestamp); CREATE TABLE postgres=# insert into t_ret values (1,’digoal’,now()), (2,’DIGOAL’,now()), (3,’digoal’,now()), (4,’abc’,now()); INSERT 0 4 postgres=# ...