1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/extensions/sqlite/sqlite-source/sqliteLimit.h Sun Mar 30 07:00:22 2008 +0000
1.3 @@ -0,0 +1,169 @@
1.4 +/*
1.5 +** 2007 May 7
1.6 +**
1.7 +** The author disclaims copyright to this source code. In place of
1.8 +** a legal notice, here is a blessing:
1.9 +**
1.10 +** May you do good and not evil.
1.11 +** May you find forgiveness for yourself and forgive others.
1.12 +** May you share freely, never taking more than you give.
1.13 +**
1.14 +*************************************************************************
1.15 +**
1.16 +** This file defines various limits of what SQLite can process.
1.17 +**
1.18 +** @(#) $Id$
1.19 +*/
1.20 +
1.21 +/*
1.22 +** The maximum length of a TEXT or BLOB in bytes. This also
1.23 +** limits the size of a row in a table or index.
1.24 +**
1.25 +** The hard limit is the ability of a 32-bit signed integer
1.26 +** to count the size: 2^31-1 or 2147483647.
1.27 +*/
1.28 +#ifndef SQLITE_MAX_LENGTH
1.29 +# define SQLITE_MAX_LENGTH 1000000000
1.30 +#endif
1.31 +
1.32 +/*
1.33 +** This is the maximum number of
1.34 +**
1.35 +** * Columns in a table
1.36 +** * Columns in an index
1.37 +** * Columns in a view
1.38 +** * Terms in the SET clause of an UPDATE statement
1.39 +** * Terms in the result set of a SELECT statement
1.40 +** * Terms in the GROUP BY or ORDER BY clauses of a SELECT statement.
1.41 +** * Terms in the VALUES clause of an INSERT statement
1.42 +**
1.43 +** The hard upper limit here is 32676. Most database people will
1.44 +** tell you that in a well-normalized database, you usually should
1.45 +** not have more than a dozen or so columns in any table. And if
1.46 +** that is the case, there is no point in having more than a few
1.47 +** dozen values in any of the other situations described above.
1.48 +*/
1.49 +#ifndef SQLITE_MAX_COLUMN
1.50 +# define SQLITE_MAX_COLUMN 2000
1.51 +#endif
1.52 +
1.53 +/*
1.54 +** The maximum length of a single SQL statement in bytes.
1.55 +** The hard limit here is the same as SQLITE_MAX_LENGTH.
1.56 +*/
1.57 +#ifndef SQLITE_MAX_SQL_LENGTH
1.58 +# define SQLITE_MAX_SQL_LENGTH 1000000
1.59 +#endif
1.60 +
1.61 +/*
1.62 +** The maximum depth of an expression tree. This is limited to
1.63 +** some extent by SQLITE_MAX_SQL_LENGTH. But sometime you might
1.64 +** want to place more severe limits on the complexity of an
1.65 +** expression. A value of 0 (the default) means do not enforce
1.66 +** any limitation on expression tree depth.
1.67 +*/
1.68 +#ifndef SQLITE_MAX_EXPR_DEPTH
1.69 +# define SQLITE_MAX_EXPR_DEPTH 1000
1.70 +#endif
1.71 +
1.72 +/*
1.73 +** The maximum number of terms in a compound SELECT statement.
1.74 +** The code generator for compound SELECT statements does one
1.75 +** level of recursion for each term. A stack overflow can result
1.76 +** if the number of terms is too large. In practice, most SQL
1.77 +** never has more than 3 or 4 terms. Use a value of 0 to disable
1.78 +** any limit on the number of terms in a compount SELECT.
1.79 +*/
1.80 +#ifndef SQLITE_MAX_COMPOUND_SELECT
1.81 +# define SQLITE_MAX_COMPOUND_SELECT 500
1.82 +#endif
1.83 +
1.84 +/*
1.85 +** The maximum number of opcodes in a VDBE program.
1.86 +** Not currently enforced.
1.87 +*/
1.88 +#ifndef SQLITE_MAX_VDBE_OP
1.89 +# define SQLITE_MAX_VDBE_OP 25000
1.90 +#endif
1.91 +
1.92 +/*
1.93 +** The maximum number of arguments to an SQL function.
1.94 +*/
1.95 +#ifndef SQLITE_MAX_FUNCTION_ARG
1.96 +# define SQLITE_MAX_FUNCTION_ARG 100
1.97 +#endif
1.98 +
1.99 +/*
1.100 +** The maximum number of in-memory pages to use for the main database
1.101 +** table and for temporary tables. The SQLITE_DEFAULT_CACHE_SIZE
1.102 +*/
1.103 +#ifndef SQLITE_DEFAULT_CACHE_SIZE
1.104 +# define SQLITE_DEFAULT_CACHE_SIZE 2000
1.105 +#endif
1.106 +#ifndef SQLITE_DEFAULT_TEMP_CACHE_SIZE
1.107 +# define SQLITE_DEFAULT_TEMP_CACHE_SIZE 500
1.108 +#endif
1.109 +
1.110 +/*
1.111 +** The maximum number of attached databases. This must be at least 2
1.112 +** in order to support the main database file (0) and the file used to
1.113 +** hold temporary tables (1). And it must be less than 32 because
1.114 +** we use a bitmask of databases with a u32 in places (for example
1.115 +** the Parse.cookieMask field).
1.116 +*/
1.117 +#ifndef SQLITE_MAX_ATTACHED
1.118 +# define SQLITE_MAX_ATTACHED 10
1.119 +#endif
1.120 +
1.121 +
1.122 +/*
1.123 +** The maximum value of a ?nnn wildcard that the parser will accept.
1.124 +*/
1.125 +#ifndef SQLITE_MAX_VARIABLE_NUMBER
1.126 +# define SQLITE_MAX_VARIABLE_NUMBER 999
1.127 +#endif
1.128 +
1.129 +/*
1.130 +** The default size of a database page.
1.131 +*/
1.132 +#ifndef SQLITE_DEFAULT_PAGE_SIZE
1.133 +# define SQLITE_DEFAULT_PAGE_SIZE 1024
1.134 +#endif
1.135 +
1.136 +/*
1.137 +** Ordinarily, if no value is explicitly provided, SQLite creates databases
1.138 +** with page size SQLITE_DEFAULT_PAGE_SIZE. However, based on certain
1.139 +** device characteristics (sector-size and atomic write() support),
1.140 +** SQLite may choose a larger value. This constant is the maximum value
1.141 +** SQLite will choose on it's own.
1.142 +*/
1.143 +#ifndef SQLITE_MAX_DEFAULT_PAGE_SIZE
1.144 +# define SQLITE_MAX_DEFAULT_PAGE_SIZE 8192
1.145 +#endif
1.146 +
1.147 +/* Maximum page size. The upper bound on this value is 32768. This a limit
1.148 +** imposed by the necessity of storing the value in a 2-byte unsigned integer
1.149 +** and the fact that the page size must be a power of 2.
1.150 +*/
1.151 +#ifndef SQLITE_MAX_PAGE_SIZE
1.152 +# define SQLITE_MAX_PAGE_SIZE 32768
1.153 +#endif
1.154 +
1.155 +/*
1.156 +** Maximum number of pages in one database file.
1.157 +**
1.158 +** This is really just the default value for the max_page_count pragma.
1.159 +** This value can be lowered (or raised) at run-time using that the
1.160 +** max_page_count macro.
1.161 +*/
1.162 +#ifndef SQLITE_MAX_PAGE_COUNT
1.163 +# define SQLITE_MAX_PAGE_COUNT 1073741823
1.164 +#endif
1.165 +
1.166 +/*
1.167 +** Maximum length (in bytes) of the pattern in a LIKE or GLOB
1.168 +** operator.
1.169 +*/
1.170 +#ifndef SQLITE_MAX_LIKE_PATTERN_LENGTH
1.171 +# define SQLITE_MAX_LIKE_PATTERN_LENGTH 50000
1.172 +#endif
