importmysql.connectordefmysql_str_to_list():# 建立与 MySQL 数据库的连接cnx=mysql.connector.connect(user='your_username',password='your_password',host='localhost',database='your_database')# 创建游标对象cursor=cnx.cursor()# 执行 SQL 查询语句query="SELECT column_name FROM table_name"cursor.exec...
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DELIMITER $$CREATEPROCEDUREIFNOTEXISTScreate_list_partition (par_valuebigint, tb_schemavarchar(128),tb_namevarchar(128))BEGINDECLAREpar_namevarchar(32);DECLAREpar_value_strvarchar(32);DECLAREpar_existint(1);DECLARE_errint(1);DECLARECONTINUEHANDLERFORSQLEXCEPTION, SQLWARNING,NOTFOUNDSET_err=1; START...
上传之后我们就会得到一个以.rpm为后缀的yum源文件,然后我们需要将该yum源安装到linux机器上的yum源清单中,通过rpm -ivh mysql57-community-release-el7.rpm,安装之后,ls /etc/yum.repos.d/ -al可以查看到系统的yum源清单,更新yum源之后,我们可以通过yum list | grep mysql查看系统中相关的mysql的资源。更新yum...
importjava.util.List;importjava.util.stream.Collectors;publicclassListToMySQL{publicstaticvoidsaveList(List<String>list){Stringstr=list.stream().collect(Collectors.joining(","));// 将str保存到MySQL中}} 1. 2. 3. 4. 5. 6. 7. 8.
返回字符串str的最左面字符的ASCII代码值。如果str是空字符串,返回0。如果str是NULL,返回NULL。 mysql> select ASCII('2'); -> 50 mysql> select ASCII(2); -> 50 mysql> select ASCII('dx'); -> 100 也可参见ORD()函数。 ORD(str) 如果字符串str最左面字符是一个多字节字符,通过以格式((first byt...
默认是分号；但是在函数和存储过程中会使用到分号导致解析不正确delimiter $$-- 随机生成一个指定长度的字符串create function rand_string(n int) returns varchar(255) begin # 定义三个变量 declare chars_str varchar(100) default 'abcdefghijklmnopqrstuvwxyzABCDEFJHIJKLMNOPQRSTUVWXYZ'; declare return_str ...
(pageIndex-1)*pageSize,',',pageSize);elseset@strSQL=concat('SELECT',fieldlist,'FROM',tableName,'ORDER BY',sortName,'LIMIT',(pageIndex-1)*pageSize,',',pageSize);endif;elseifsortName=''||sortName=nullthenset@strSQL=concat('SELECT',fieldlist,'FROM',tableName,'WHERE',strWhere,'LIMIT',...
(arg2); self->who = strjoin(copyinstr(arg3),strjoin("@",copyinstr(arg4))); self->querystart = timestamp; self->qc = 0; } mysql*:::query-cache-hit { self->qc = 1; } mysql*:::query-cache-miss { self->qc = 0; } mysql*:::query-done { printf("%-20s %-20s %-40s...
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