9 10 /* retrieve the first character in the string */ 11 dbms_output.put_line ( SUBSTR (greetings, 1, 1)); 12 13 /* retrieve the last character in the string */ 14 dbms_output.put_line ( SUBSTR (greetings, -1, 1)); 15 16 /* retrieve five characters, 17 starting from the s...
SQL_CCS_CREATE_CHARACTER_SETSQL_CCS_COLLATE_CLAUSESQL_CCS_LIMITED_COLLATIONSQL-92 完全一致性驱动程序将始终按支持返回所有这些选项。 返回值为“0”表示 不支持 CREATE CHARACTER SET 语句。 SQL_CREATE_COLLATION 3.0 一个SQLUINTEGER 位掩码,用于枚举 CREATE COLLATION 语句中的子句,如数据源支持的 SQL-92 ...
为character、binary、text、ntext 或者 image表达式。 start 指定返回字符的起始位置的整数或 bigint 表达式 。 (编号从 1 开始,意味着表达式中的第一个字符为 1)。 如果 start 小于 1,则返回的表达式的起始位置为表达式中指定的第一个字符 。 在这种情况下,返回的字符数是后两者中的较大值:start+length之和...
Specify a parameter name by using an at sign (@) as the first character. The parameter name must comply with the rules for identifiers. Parameters are local to the function; the same parameter names can be used in other functions. Parameters can take the place only of constants; they can...
== false) { try { $exists = (mysqli_num_rows( $result ) > 0); // The '@' character suppresses errors } catch(Exception $e) { $exists = false; } } break; case SQLITE: global $sqlite_db_connection; $query = "SELECT first_name, last_name FROM users WHERE user_id = $id;"...
[ ,FIELDQUOTE='quote_character'] [ ,FORMATFILE='format_file_path'] [ ,FORMATFILE_DATA_SOURCE='data_source_name'] [ ,FIRSTROW=first_row] [ ,LASTROW=last_row] [ ,MAXERRORS=maximum_errors] [ ,ERRORFILE='file_name'] [ ,ERRORFILE_DATA_SOURCE='data_source_name'] [ ,ROWS_PER_BATCH...
If supplied as a variable (@database_name_var), this name can be specified either as a string constant (@database_name_var=database name) or as a variable of character string data type, except for the ntext or text data types. Note The mirror database in a database mirroring ...
An implicit conversion occurs when another character data type is used as input. Large string data types nvarchar(max) and varchar(max) cannot be used. In the following example, the @SearchWord variable, which is defined as varchar(30), causes an implicit conversion in the CONTAINS predicate....
SETTEXTSIZE0;-- Create variables for the character string and for the current-- position in the string.DECLARE@positionINT, @stringCHAR(8);-- Initialize the current position and the string variables.SET@position=1;SET@string='New Moon'; WHILE @position <= DATALENGTH(@string)BEGINSELECTASCII...
'VARCHAR', 'VARCHARACTER', 'VARIABLES', 'VARYING', 'VIEW', 'VIRTUAL', 'WAIT', 'WARNINGS', 'WEEK', 'WEIGHT_STRING', 'WHEN', 'WHERE', 'WHILE', 'WITH', 'WITHOUT', 'WORK', 'WRAPPER', 'WRITE', 'X509', 'XA', 'XID', 'XML', 'XOR', 'YEAR', 'YEAR_MONTH', 'ZEROFILL' ] ...