我试图在字符串中替换MySQL插入的值。这个值在开头和结尾都包含$字符。结尾的$-字符和结束的‘-字符在regex.Replace中丢失
这是我的VB.NET代码:
Dim RawString As String = "$ Million's of Dollar Company $"
Dim EscapedValue As String = MySql.Data.MySqlClient.MySqlHelper.EscapeString(RawString)
Dim mySQLCommand As String = "INSERT INT
#!/usr/bin/python
#Program:
# insert data into mysql and the display them
import MySQLdb as mdb
conn = mdb.connect(host = 'localhost', user = 'root', passwd = '8023xue0526', db ='contact')
cur = conn.cursor()
cur.execute("insert into contact values('123221
我在使用这个时遇到了一些问题:
WARN com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'WHERE Accounts.UUID = WarAccounts.UUIDAND Accounts.UUID = 'c7a00fe7-826d-46da
我试图在PHPMyAdmin中运行这个sql查询:
--create a mysql contact table
--delete contact table if already exists
DROP TABLE IF EXISTS contact;
--create new table named contact with fields as specified
CREATE TABLE contact(
contactID int PRIMARY KEY,
name VARCHAR(50),
company VARCHAR(30),
email VAR
下面的查询耗时超过8分钟,处理了900,000行。它非常慢,影响了我的产品。我不知道为什么查询变慢了,所有的索引都设置得很好。
explain SELECT
COUNT(DISTINCT (cinfo.CONTACT_ID))
FROM
cinfo
INNER JOIN
LTocMapping ON cinfo.CONTACT_ID = LTocMapping.CONTACT_ID
WHERE
(((((((((cinfo.COUNTRY LIKE '%Panama%')
OR (cinfo.COUNTRY LI
我很难找到一个优雅的解决方案来根据分隔字符串对mysql查询的结果进行排序。我将在下面更详细地解释
我正在创建一个联系人数据库,单个用户可以在其中添加/删除列表中的人员。当用户添加新联系人时,我将添加的联系人id附加到一个分隔字符串中,并将该数据存储在与该用户关联的数据库列中(名为contacts):
$userID = ?? //YOUR ID
$contactID = ?? //WHATEVER THE ADDED USER ID IS
$confirm = 0 //has the user been confirmed
$sql = "SELECT contacts FROM u