['DataError','DatabaseError','Error','IntegrityError','InterfaceError','InternalError','NotSupportedError','OperationalError','ProgrammingError','Warning','__call__','__class__','__delattr__','__dir__','__doc__'
根据X/Open和SQL Access Group SQL CAE规范(1992)所进行的定义,SQLERROR返回SQLSTATE值。SQLSTATE值是包含五个字符的字符串,由2个字符的SQL错误类和3个字符的子类构成。五个字符包含数值或者大写字母, 代表各种错误或者警告条件的代码。成功的状态是由00000标识的。SQL
MySQL :: MySQL 8.0 Reference Manual :: 8.2.1.23 Avoiding Full Table Scans https://dev.mysql.com/doc/refman/8.0/en/table-scan-avoidance.html explain 语句 The output fromEXPLAINshowsALLin thetypecolumn when MySQL uses afull table scanto resolve a query. 慢SQL 分析与优化 https://mp.weixin.q...
SQLFetchfetches the next rowset of data from the result set and returns data for all bound columns. Syntax C++Copy SQLRETURNSQLFetch( SQLHSTMT StatementHandle); Arguments StatementHandle [Input] Statement handle. Returns SQL_SUCCESS, SQL_SUCCESS_WITH_INFO, SQL_NO_DATA, SQL_STILL_EXECUTING, SQL...
SQLFetchfetches the next rowset of data from the result set and returns data for all bound columns. Syntax C++Copy SQLRETURNSQLFetch( SQLHSTMT StatementHandle); Arguments StatementHandle [Input] Statement handle. Returns SQL_SUCCESS, SQL_SUCCESS_WITH_INFO, SQL_NO_DATA, SQL_STILL_EXECUTING, SQL...
void selectData() { qx::QxSqlQuery query("WHERE t_person.first_name = :first_name"); query.bind(":first_name", "王五"); QList<person> persons; QSqlError daoError = qx::dao::fetch_by_query(query, persons); TurboLog::instance().getConsoleLogger()->error("select table:{}", ...
FETCH FIRST number ROWS ONLY; 旧版Oracle 语法: SELECT column_name(s) FROM table_name WHERE ROWNUM <= number; 带有ORDER BY 的旧版 Oracle 语法: SELECT * FROM (SELECT column_name(s) FROM table_name ORDER BY column_name(s)) WHERE ROWNUM <= number; ...
DATABASE 整个数据库。 XACT2 优化锁定中使用的事务 ID (TID) 锁定。 有关详细信息,请参阅事务ID (TID) 锁定。1HoBT 的TABLE 选项会影响 LOCK_ESCALATION 和 锁。2 其他锁定资源可用于 XACT 锁资源,请参阅优化锁定的诊断附加功能。锁模式数据库引擎使用不同的锁模式锁定资源,这些锁模式确定了并发事务访问资源...
Syntax for Transact-SQL multi-statement table-valued functions. syntaxsql 複製 CREATE [ OR ALTER ] FUNCTION [ schema_name. ] function_name ( [ { @parameter_name [ AS ] [ type_schema_name. ] parameter_data_type [ NULL ] [ = default ] [ READONLY ] } [ , ...n ] ] ) RETURNS...
SQL_PROCEDURE_TERM 1.0 包含过程数据源供应商名称的字符串;例如,“database procedure”、“stored procedure”、“procedure”、“package”或“stored query”。 SQL_PROCEDURES 1.0 字符串:如果数据源支持过程,并且驱动程序支持 ODBC 过程调用语法,则为“Y”;否则为“N”。 SQL_QUOTED_IDENTIFIER_CASE 2.0 SQLUSM...