AI检测代码解析 CREATETABLEuser_logs(user_id STRING,log_data STRING);INSERTINTOuser_logs(user_id,log_data)VALUES('user1','login,view,logout'),('user2','login,view'),('user3','view,logout'); 1. 2. 3. 4. 5. 6. 7. 8. 9. 我们可以使用split()函数将log_data中的字符串转为列表...
createFunction[dbo].[SpliteStringToList](@stringsvarchar(2000)) Returns@ReturnTableTable(IDvarchar(max)) As Begin Insert@ReturnTable selectsubstring(c,2,charindex(',',c,2)-2)asempnofrom ( selectsubstring(csv.emps,iter.pos,len(csv.emps))ascfrom ( select','+@strings+','asemps ) csv, (...
--示例 :select * from [dbo].[SpliteStringToList]('123,xxx,dfdsf,rer') --=== createFunction[dbo].[SpliteStringToList](@stringsvarchar(2000)) Returns@ReturnTableTable(IDvarchar(max)) As Begin Insert@ReturnTable selectsubstring(c,2,charindex(',',c,2)-2)asempnofrom ( selectsubstring(cs...
使用以下代码示例: importjava.sql.Connection;importjava.sql.PreparedStatement;importjava.sql.ResultSet;importjava.sql.SQLException;importjava.util.List;publicclassMySQLExample{publicstaticvoidmain(String[]args){try{Connectionconnection=DatabaseUtil.getConnection();List<String>parameters=List.of("value1","val...
首字符ascii函数:ascii(string str) 左补足函数:lpad(string str, int len, string pad) 右补足函数:rpad(string str, int len, string pad) 分割字符串函数: split(string str, string pat) 集合查找函数: find_in_set(string str, string strList) ...
*/@TestpublicvoidasyncCdkCreate(){int num=100000;List<CdkInfo>list=newArrayList<>(num);Date date=newDate();String createUser="test";for(Integer i=0;i<num;i++){CdkInfo temp=newCdkInfo();temp.setCdkNo(String.valueOf(i));temp.setCreateTime(date);temp.setCreateUser(createUser);list.ad...
下面描述中,关于query()方法说法错误的答案是。〔 〕 A. List query(String sql, RowMapper rowMapper)会执行String类型参数提供的SQL语句,并通过RowMapper返回一个List类型的结果。 B. List query〔String sql, PreparedStatementSetter pss, RowMapper rowMapper〕会根据String类型参数提供的SQL语句创建PreparedStatement...
STRING_AGG( expression , separator ) [<order_clause>]<order_clause>::=WITHINGROUP(ORDERBY<order_by_expression_list>[ASC|DESC] ) Arguments expression Anexpressionof any type. Expressions are converted tonvarcharorvarchartypes during concatenation. Non-string types are converted tonvarchartype. ...
Msg 245, Level 16, State 1, Line 3 Conversion failed when converting the varchar value ' is not a string.' to data type int. 为了计算表达式 @notastring + ' is not a string.',SQL Server 需要先遵循数据类型优先级的规则来完成隐式转换,然后才能计算表达式的结果。 由于 int 的优先级高于 varc...
\copy { table [ ( column_list ) ] | ( query ) } { from | to } { filename | stdin | stdout | pstdin | pstdout } [ with ] [ binary ] [ oids ] [ delimiter [ as ] 'character' ] [ null [ as ] 'string' ] [ csv [ header ] [ quote [ as ] 'character' ] [ escape...