this statement is equivalent to nested IF...THEN...ELSE...IF...THEN statements, but only one END IF is needed. The following example uses an IF...THEN...ELSIF...ELSE statement to count the number of employees by
Statement stmt=null;try{//a.导入驱动,加载具体的驱动类Class.forName("oracle.jdbc.OracleDriver");//加载具体的驱动类//b.与数据库建立连接connection =DriverManager.getConnection(URL, USERNAME, PWD);//c.发送sql,执行(增删改、查)stmt =connection.createStatement();//String sql = "insert into student ...
9、说明:创建视图:create view viewname as select statement 删除视图:drop view viewname10、说明:几个简单的基本的sql语句选择:select...RecID 是自增长字段, 写一个SQL语句, 找出表的第31到第40个记录。 ...Transact-SQL 语句影响的行数的信息。...SET NOCOUNT 为 ON 时,不返回计数(表示受 Transact-SQ...
如果没有指定表,COUNT(*)返回1。 该查询返回%ROWCOUNT为1。 如下示例所示: ClassMethod Count2() { s myquery = "SELECT COUNT(*) AS Recs" s tStatement = ##class(%SQL.Statement).%New() s qStatus = tStatement.%Prepare(myquery) if qStatus'=1 { w "%Prepare failed:" d $System.Status....
{case*parser.Node_ColumnDef:columnCounter++}}// 读取 SQLE 传递过来的该参数配置的值count:=rule.Params.GetParam("max_column_count").Int()ifcount>0&&columnCounter>count{returnfmt.Sprintf("表字段不建议超过%d个,目前有%d个",count,columnCounter),nil}}return"",nil}plugin.AddRule(rule1,rule1...
MySQL SQL Statement 官方测试数据:https://dev.mysql.com/doc/index-other.html&https://dev.mysql.com/doc/employee/en/sakila-structure.html DQL:数据查询语言 https://dev.mysql.com/doc/refman/8.3/en/select.html 单表查询 --常用格式SELECTselection_list/*要查询的列名称*/FROMtable_list/*要查询的...
s tStatement = ##class(%SQL.Statement).%New() s qStatus = tStatement.%Prepare(.myquery) if qStatus'=1 { w "%Prepare failed:" d $System.Status.DisplayError(qStatus) q } s rset = tStatement.%Execute() d rset.%Display()
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s tStatement = ##class(%SQL.Statement).%New() s qStatus = tStatement.%Prepare(.myq) if qStatus'=1 {w "%Prepare failed:" d $System.Status.DisplayError(qStatus) q} for i=1:10:60 { s rset = tStatement.%Execute(i, i+9) while rset.%Next() { d rset.%Print() } w !! }...
System.out.println(count); }catch(Exceptione) { thrownewRuntimeException(e); }finally{ //7.关闭资源(顺序:后打开,先关闭) if(stmt!=null){ try{ stmt.close(); }catch(SQLExceptione) { System.out.println("Statement关闭失败!"); thrownewRuntimeException(e); ...