s q2 = "WHERE %ODBCOUT(DOB) %INLIST ?" s myquery = q1 _ q2 s tStatement = ##class(%SQL.Statement).%New() s tStatement.%SelectMode = 1 s qStatus = tStatement.%Prepare(myquery) if qStatus'=1 { w "%Prepare failed:" ...
/// d ##class(PHA.TEST.SQLCommand).In() ClassMethod In() { s q1 = "SELECT Name,DOB FROM Sample.Person " s q2 = "WHERE DOB IN('1956-03-05','1956-04-08','1956-04-18','1990-04-25')" s myquery = q1_q2 s tStatement = ##class(%SQL.Statement).%New() s tStatement.%Se...
下面是一个使用PreparedStatement实现IN查询的示例代码: Stringsql="SELECT column_name FROM table_name WHERE column_name IN (?, ?, ?)";List<String>values=Arrays.asList("value1","value2","value3");try(Connectionconn=DriverManager.getConnection(url,username,password);PreparedStatementstmt=conn.prepare...
in 是把外表和内表作hash 连接,而exists是对外表作loop循环,每次loop循环再对内表进行查询。一直以来认为exists比in效率高的说法是不准确的。 not in 和not exists 如果查询语句使用了not in 那么内外表都进行全表扫描,没有用到索引;而not extsts 的子查询依然能用到表上的索引。所以无论那个表大,用not exis...
ClassMethod Predicates2() { s list = $LISTBUILD("MA","VT","NH") s q1 = "SELECT Name,Home_State FROM Sample.Person " s q2 = "WHERE Home_State %INLIST(?)" s myquery = q1 _ q2 s tStatement = ##class(%SQL.Statement).%New() s qStatus = tStatement.%Prepare(myquery) if q...
Status.DisplayError(qStatus) q } s rset = tStatement.%Execute(births) d rset.%Display() } 代码语言:javascript 代码运行次数:0 运行 AI代码解释 DHC-APP>d ##class(PHA.TEST.SQLCommand).List1() Name DOB yaoxin 1990-04-25 1 Rows(s) Affected %INLIST and IN %INLIST和IN谓词都可以用于提供...
value_list: value[, value]... assignment:col_name=value assignment_list: assignment[, assignment]...INSERTinserts new rowsintoan existingtable. TheINSERT...VALUESandINSERT...SETformsofthe statementinsertrows basedonexplicitly specifiedvalues. TheINSERT...SELECTform inserts rows ...
To create a simple SQL SELECT Statement, you must specify the column(s) name and the table name. The whole query is called SQL SELECT Statement.Syntax of SQL SELECT Statement:SELECT column_list FROM table-name [WHERE Clause] [GROUP BY clause] [HAVING clause] [ORDER BY clause];...
语句级事件(sql_statement_completed、sql_statement_starting、sp_statement_starting、sp_statement_completed) 登录和注销事件(login、process_login_finish、login_event、logout) 锁定事件(lock_acquired、lock_cancel、lock_released) 等待事件(wait_info、wait_info_external) ...
statement_list [ELSEIF search_condition THEN statement_list] ... [ELSE statement_list] END IF; 其中,search_condition是反馈 true 或 false 的逻辑表达式。如果逻辑表达式含有 SELECT 语句,必须要括号将 SELECT 语句括起来。 例:查询计算机系的办公室位置。如果查询结果为空,则显示"办公地点不详",否则显示其...