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5956d1d942
sqlite/ext/intck/sqlite3intck.c
dan 5956d1d942 Fix detection of surplus index entries when all indexed fields are NULL. 
FossilOrigin-Name: 5f310fb7be450c96f01c21e6fd1377d4a274784377d0bd811922ab63e612bd11
2024-02-23 17:10:39 +00:00

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/*
** 2024-02-08
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
*/
#include "sqlite3intck.h"
#include <string.h>
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
/*
** nKeyVal:
** The number of values that make up the 'key' for the current pCheck
** statement.
**
** rc:
** Error code returned by most recent sqlite3_intck_step() or
** sqlite3_intck_unlock() call. This is set to SQLITE_DONE when
** the integrity-check operation is finished.
**
** zErr:
** If the object has entered the error state, this is the error message.
** Is freed using sqlite3_free() when the object is deleted.
**
** zTestSql:
** The value returned by the most recent call to sqlite3_intck_testsql().
** Each call to testsql() frees the previous zTestSql value (using
** sqlite3_free()) and replaces it with the new value it will return.
*/
struct sqlite3_intck {
sqlite3 *db;
const char *zDb; /* Copy of zDb parameter to _open() */
char *zObj; /* Current object. Or NULL. */
sqlite3_stmt *pCheck; /* Current check statement */
char *zKey;
int nKeyVal;
char *zMessage;
int bCorruptSchema;
int rc; /* Error code */
char *zErr; /* Error message */
char *zTestSql; /* Returned by sqlite3_intck_test_sql() */
};
/*
** Some error has occurred while using database p->db. Save the error message
** and error code currently held by the database handle in p->rc and p->zErr.
*/
static void intckSaveErrmsg(sqlite3_intck *p){
const char *zDberr = sqlite3_errmsg(p->db);
p->rc = sqlite3_errcode(p->db);
if( zDberr ){
sqlite3_free(p->zErr);
p->zErr = sqlite3_mprintf("%s", zDberr);
}
}
/*
** If the handle passed as the first argument is already in the error state,
** then this function is a no-op (returns NULL immediately). Otherwise, if an
** error occurs within this function, it leaves an error in said handle.
**
** Otherwise, this function attempts to prepare SQL statement zSql and
** return the resulting statement handle to the user.
*/
static sqlite3_stmt *intckPrepare(sqlite3_intck *p, const char *zSql){
sqlite3_stmt *pRet = 0;
if( p->rc==SQLITE_OK ){
p->rc = sqlite3_prepare_v2(p->db, zSql, -1, &pRet, 0);
if( p->rc!=SQLITE_OK ){
intckSaveErrmsg(p);
assert( pRet==0 );
}
}
return pRet;
}
/*
** If the handle passed as the first argument is already in the error state,
** then this function is a no-op (returns NULL immediately). Otherwise, if an
** error occurs within this function, it leaves an error in said handle.
**
** Otherwise, this function treats argument zFmt as a printf() style format
** string. It formats it according to the trailing arguments and then
** attempts to prepare the results and return the resulting prepared
** statement.
*/
static sqlite3_stmt *intckPrepareFmt(sqlite3_intck *p, const char *zFmt, ...){
sqlite3_stmt *pRet = 0;
va_list ap;
char *zSql = 0;
va_start(ap, zFmt);
zSql = sqlite3_vmprintf(zFmt, ap);
if( p->rc==SQLITE_OK && zSql==0 ){
p->rc = SQLITE_NOMEM;
}
pRet = intckPrepare(p, zSql);
sqlite3_free(zSql);
va_end(ap);
return pRet;
}
/*
** Finalize SQL statement pStmt. If an error occurs and the handle passed
** as the first argument does not already contain an error, store the
** error in the handle.
*/
static void intckFinalize(sqlite3_intck *p, sqlite3_stmt *pStmt){
int rc = sqlite3_finalize(pStmt);
if( p->rc==SQLITE_OK && rc!=SQLITE_OK ){
intckSaveErrmsg(p);
}
}
/*
** Execute SQL statement zSql. There is no way to obtain any results
** returned by the statement. This function uses the sqlite3_intck error
** code convention.
*/
static void intckExec(sqlite3_intck *p, const char *zSql){
sqlite3_stmt *pStmt = 0;
pStmt = intckPrepare(p, zSql);
while( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) );
intckFinalize(p, pStmt);
}
/*
** Wrapper around sqlite3_malloc64() that uses the sqlite3_intck error
** code convention.
*/
static void *intckMalloc(sqlite3_intck *p, sqlite3_int64 nByte){
void *pRet = 0;
assert( nByte>0 );
if( p->rc==SQLITE_OK ){
pRet = sqlite3_malloc64(nByte);
if( pRet==0 ){
p->rc = SQLITE_NOMEM;
}
}
return pRet;
}
/*
** Like strdup(), but uses the sqlite3_intck error code convention. Any
** returned buffer should eventually be freed using sqlite3_free().
*/
static char *intckStrdup(sqlite3_intck *p, const char *zIn){
char *zOut = 0;
int nIn = strlen(zIn);
zOut = (char*)intckMalloc(p, nIn+1);
if( zOut ){
memcpy(zOut, zIn, nIn+1);
}
return zOut;
}
/*
** A wrapper around sqlite3_mprintf() that uses the sqlite3_intck error
** code convention.
*/
static char *intckMprintf(sqlite3_intck *p, const char *zFmt, ...){
va_list ap;
char *zRet = 0;
va_start(ap, zFmt);
zRet = sqlite3_vmprintf(zFmt, ap);
if( p->rc==SQLITE_OK ){
if( zRet==0 ){
p->rc = SQLITE_NOMEM;
}
}else{
sqlite3_free(zRet);
zRet = 0;
}
return zRet;
}
/*
** This is used by sqlite3_intck_unlock() to save the vector key value
** required to restart the current pCheck query as a nul-terminated string
** in p->zKey.
*/
static void intckSaveKey(sqlite3_intck *p){
int ii;
char *zSql = 0;
sqlite3_stmt *pStmt = 0;
sqlite3_stmt *pXinfo = 0;
const char *zDir = 0;
assert( p->pCheck );
assert( p->zKey==0 );
pXinfo = intckPrepareFmt(p,
"SELECT group_concat(desc, '') FROM %Q.sqlite_schema s, "
"pragma_index_xinfo(%Q, %Q) "
"WHERE s.type='index' AND s.name=%Q",
p->zDb, p->zObj, p->zDb, p->zObj
);
if( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pXinfo) ){
zDir = (const char*)sqlite3_column_text(pXinfo, 0);
}
if( zDir==0 ){
/* Object is a table, not an index. This is the easy case,as there are
** no DESC columns or NULL values in a primary key. */
const char *zSep = "SELECT '(' || ";
for(ii=0; ii<p->nKeyVal; ii++){
zSql = intckMprintf(p, "%z%squote(?)", zSql, zSep);
zSep = " || ', ' || ";
}
zSql = intckMprintf(p, "%z || ')'", zSql);
}else{
/* Object is an index. */
assert( p->nKeyVal>1 );
for(ii=p->nKeyVal; ii>0; ii--){
int bLastIsDesc = zDir[ii-1]=='1';
int bLastIsNull = sqlite3_column_type(p->pCheck, ii)==SQLITE_NULL;
const char *zLast = sqlite3_column_name(p->pCheck, ii);
char *zLhs = 0;
char *zRhs = 0;
char *zWhere = 0;
if( bLastIsNull ){
if( bLastIsDesc ) continue;
zWhere = intckMprintf(p, "'%s IS NOT NULL'", zLast);
}else{
const char *zOp = bLastIsDesc ? "<" : ">";
zWhere = intckMprintf(p, "'%s %s ' || quote(?%d)", zLast, zOp, ii);
}
if( ii>1 ){
const char *zLhsSep = "";
const char *zRhsSep = "";
int jj;
for(jj=0; jj<ii-1; jj++){
const char *zAlias = (const char*)sqlite3_column_name(p->pCheck,jj+1);
zLhs = intckMprintf(p, "%z%s%s", zLhs, zLhsSep, zAlias);
zRhs = intckMprintf(p, "%z%squote(?%d)", zRhs, zRhsSep, jj+1);
zLhsSep = ",";
zRhsSep = " || ',' || ";
}
zWhere = intckMprintf(p,
"'(%z) IS (' || %z || ') AND ' || %z",
zLhs, zRhs, zWhere);
}
zWhere = intckMprintf(p, "'WHERE ' || %z", zWhere);
zSql = intckMprintf(p, "%z%s(quote( %z ) )",
zSql,
(zSql==0 ? "VALUES" : ",\n "),
zWhere
);
}
zSql = intckMprintf(p,
"WITH wc(q) AS (\n%z\n)"
"SELECT 'VALUES' || group_concat('(' || q || ')', ',\n ') FROM wc"
, zSql
);
}
pStmt = intckPrepare(p, zSql);
if( p->rc==SQLITE_OK ){
for(ii=0; ii<p->nKeyVal; ii++){
sqlite3_bind_value(pStmt, ii+1, sqlite3_column_value(p->pCheck, ii+1));
}
if( SQLITE_ROW==sqlite3_step(pStmt) ){
p->zKey = intckStrdup(p, (const char*)sqlite3_column_text(pStmt, 0));
}
intckFinalize(p, pStmt);
}
sqlite3_free(zSql);
intckFinalize(p, pXinfo);
}
/*
** Find the next database object (table or index) to check. If successful,
** set sqlite3_intck.zObj to point to a nul-terminated buffer containing
** the object's name before returning.
*/
static void intckFindObject(sqlite3_intck *p){
sqlite3_stmt *pStmt = 0;
char *zPrev = p->zObj;
p->zObj = 0;
assert( p->rc==SQLITE_OK );
assert( p->pCheck==0 );
pStmt = intckPrepareFmt(p,
"WITH tables(table_name) AS ("
" SELECT name"
" FROM %Q.sqlite_schema WHERE (type='table' OR type='index') AND rootpage"
" UNION ALL "
" SELECT 'sqlite_schema'"
")"
"SELECT table_name FROM tables "
"WHERE ?1 IS NULL OR table_name%s?1 "
"ORDER BY 1"
, p->zDb, (p->zKey ? ">=" : ">")
);
if( p->rc==SQLITE_OK ){
sqlite3_bind_text(pStmt, 1, zPrev, -1, SQLITE_TRANSIENT);
if( sqlite3_step(pStmt)==SQLITE_ROW ){
p->zObj = intckStrdup(p, (const char*)sqlite3_column_text(pStmt, 0));
}
}
intckFinalize(p, pStmt);
/* If this is a new object, ensure the previous key value is cleared. */
if( sqlite3_stricmp(p->zObj, zPrev) ){
sqlite3_free(p->zKey);
p->zKey = 0;
}
sqlite3_free(zPrev);
}
/*
** Return the size in bytes of the first token in nul-terminated buffer z.
** For the purposes of this call, a token is either:
**
** * a quoted SQL string,
* * a contiguous series of ascii alphabet characters, or
* * any other single byte.
*/
static int intckGetToken(const char *z){
char c = z[0];
int iRet = 1;
if( c=='\'' || c=='"' || c=='`' ){
while( 1 ){
if( z[iRet]==c ){
iRet++;
if( z[iRet+1]!=c ) break;
}
iRet++;
}
}
else if( c=='[' ){
while( z[iRet++]!=']' && z[iRet] );
}
else if( (c>='A' && c<='Z') || (c>='a' && c<='z') ){
while( (z[iRet]>='A' && z[iRet]<='Z') || (z[iRet]>='a' && z[iRet]<='z') ){
iRet++;
}
}
return iRet;
}
/*
** Return true if argument c is an ascii whitespace character.
*/
static int intckIsSpace(char c){
return (c==' ' || c=='\t' || c=='\n' || c=='\r');
}
/*
** Argument z points to the text of a CREATE INDEX statement. This function
** identifies the part of the text that contains either the index WHERE
** clause (if iCol<0) or the iCol'th column of the index.
**
** If (iCol<0), the identified fragment does not include the "WHERE" keyword,
** only the expression that follows it. If (iCol>=0) then the identified
** fragment does not include any trailing sort-order keywords - "ASC" or
** "DESC".
**
** If the CREATE INDEX statement does not contain the requested field or
** clause, NULL is returned and (*pnByte) is set to 0. Otherwise, a pointer to
** the identified fragment is returned and output parameter (*pnByte) set
** to its size in bytes.
*/
static const char *intckParseCreateIndex(const char *z, int iCol, int *pnByte){
int iOff = 0;
int iThisCol = 0;
int iStart = 0;
int nOpen = 0;
const char *zRet = 0;
int nRet = 0;
int iEndOfCol = 0;
/* Skip forward until the first "(" token */
while( z[iOff]!='(' ){
iOff += intckGetToken(&z[iOff]);
if( z[iOff]=='\0' ) return 0;
}
assert( z[iOff]=='(' );
nOpen = 1;
iOff++;
iStart = iOff;
while( z[iOff] ){
const char *zToken = &z[iOff];
int nToken = 0;
/* Check if this is the end of the current column - either a "," or ")"
** when nOpen==1. */
if( nOpen==1 ){
if( z[iOff]==',' || z[iOff]==')' ){
if( iCol==iThisCol ){
int iEnd = iEndOfCol ? iEndOfCol : iOff;
nRet = (iEnd - iStart);
zRet = &z[iStart];
break;
}
iStart = iOff+1;
while( intckIsSpace(z[iStart]) ) iStart++;
iThisCol++;
}
if( z[iOff]==')' ) break;
}
if( z[iOff]=='(' ) nOpen++;
if( z[iOff]==')' ) nOpen--;
nToken = intckGetToken(zToken);
if( (nToken==3 && 0==sqlite3_strnicmp(zToken, "ASC", nToken))
|| (nToken==4 && 0==sqlite3_strnicmp(zToken, "DESC", nToken))
){
iEndOfCol = iOff;
}else if( 0==intckIsSpace(zToken[0]) ){
iEndOfCol = 0;
}
iOff += nToken;
}
/* iStart is now the byte offset of 1 byte passed the final ')' in the
** CREATE INDEX statement. Try to find a WHERE clause to return. */
while( zRet==0 && z[iOff] ){
int n = intckGetToken(&z[iOff]);
if( n==5 && 0==sqlite3_strnicmp(&z[iOff], "where", 5) ){
zRet = &z[iOff+5];
nRet = strlen(zRet);
}
iOff += n;
}
/* Trim any whitespace from the start and end of the returned string. */
if( zRet ){
while( intckIsSpace(zRet[0]) ){
nRet--;
zRet++;
}
while( nRet>0 && intckIsSpace(zRet[nRet-1]) ) nRet--;
}
*pnByte = nRet;
return zRet;
}
/*
** User-defined SQL function wrapper for intckParseCreateIndex():
**
** SELECT parse_create_index(<sql>, <icol>);
*/
static void intckParseCreateIndexFunc(
sqlite3_context *pCtx,
int nVal,
sqlite3_value **apVal
){
const char *zSql = (const char*)sqlite3_value_text(apVal[0]);
int idx = sqlite3_value_int(apVal[1]);
const char *zRes = 0;
int nRes = 0;
assert( nVal==2 );
if( zSql ){
zRes = intckParseCreateIndex(zSql, idx, &nRes);
}
sqlite3_result_text(pCtx, zRes, nRes, SQLITE_TRANSIENT);
}
/*
** Return true if sqlite3_intck.db has automatic indexes enabled, false
** otherwise.
*/
static int intckGetAutoIndex(sqlite3_intck *p){
int bRet = 0;
sqlite3_stmt *pStmt = 0;
pStmt = intckPrepare(p, "PRAGMA automatic_index");
if( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
bRet = sqlite3_column_int(pStmt, 0);
}
intckFinalize(p, pStmt);
return bRet;
}
/*
** Return true if zObj is an index, or false otherwise.
*/
static int intckIsIndex(sqlite3_intck *p, const char *zObj){
int bRet = 0;
sqlite3_stmt *pStmt = 0;
pStmt = intckPrepareFmt(p,
"SELECT 1 FROM %Q.sqlite_schema WHERE name=%Q AND type='index'",
p->zDb, zObj
);
if( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
bRet = 1;
}
intckFinalize(p, pStmt);
return bRet;
}
/*
** Return a pointer to a nul-terminated buffer containing the SQL statement
** used to check database object zObj (a table or index) for corruption.
** If parameter zPrev is not NULL, then it must be a string containing the
** vector key required to restart the check where it left off last time.
** If pnKeyVal is not NULL, then (*pnKeyVal) is set to the number of
** columns in the vector key value for the specified object.
**
** This function uses the sqlite3_intck error code convention.
*/
static char *intckCheckObjectSql(
sqlite3_intck *p, /* Integrity check object */
const char *zObj, /* Object (table or index) to scan */
const char *zPrev, /* Restart key vector, if any */
int *pnKeyVal /* OUT: Number of key-values for this scan */
){
char *zRet = 0;
sqlite3_stmt *pStmt = 0;
int bAutoIndex = 0;
int bIsIndex = 0;
const char *zCommon =
/* Relation without_rowid also contains just one row. Column "b" is
** set to true if the table being examined is a WITHOUT ROWID table,
** or false otherwise. */
", without_rowid(b) AS ("
" SELECT EXISTS ("
" SELECT 1 FROM tabname, pragma_index_list(tab, db) AS l"
" WHERE origin='pk' "
" AND NOT EXISTS (SELECT 1 FROM sqlite_schema WHERE name=l.name)"
" )"
")"
""
/* Table idx_cols contains 1 row for each column in each index on the
** table being checked. Columns are:
**
** idx_name: Name of the index.
** idx_ispk: True if this index is the PK of a WITHOUT ROWID table.
** col_name: Name of indexed column, or NULL for index on expression.
** col_expr: Indexed expression, including COLLATE clause.
** col_alias: Alias used for column in 'intck_wrapper' table.
*/
", idx_cols(idx_name, idx_ispk, col_name, col_expr, col_alias) AS ("
" SELECT l.name, (l.origin=='pk' AND w.b), i.name, COALESCE(("
" SELECT parse_create_index(sql, i.seqno) FROM "
" sqlite_schema WHERE name = l.name"
" ), format('\"%w\"', i.name) || ' COLLATE ' || quote(i.coll)),"
" 'c' || row_number() OVER ()"
" FROM "
" tabname t,"
" without_rowid w,"
" pragma_index_list(t.tab, t.db) l,"
" pragma_index_xinfo(l.name) i"
" WHERE i.key"
" UNION ALL"
" SELECT '', 1, '_rowid_', '_rowid_', 'r1' FROM without_rowid WHERE b=0"
")"
""
""
/*
** For a PK declared as "PRIMARY KEY(a, b) ... WITHOUT ROWID", where
** the intck_wrapper aliases of "a" and "b" are "c1" and "c2":
**
** o_pk: "o.c1, o.c2"
** i_pk: "i.'a', i.'b'"
** ...
** n_pk: 2
*/
", tabpk(db, tab, idx, o_pk, i_pk, q_pk, eq_pk, ps_pk, pk_pk, n_pk) AS ("
" WITH pkfields(f, a) AS ("
" SELECT i.col_name, i.col_alias FROM idx_cols i WHERE i.idx_ispk"
" )"
" SELECT t.db, t.tab, t.idx, "
" group_concat(a, ', '), "
" group_concat('i.'||quote(f), ', '), "
" group_concat('quote(o.'||a||')', ' || '','' || '), "
" format('(%s)==(%s)',"
" group_concat('o.'||a, ', '), "
" group_concat(format('\"%w\"', f), ', ')"
" ),"
" group_concat('%s', ','),"
" group_concat('quote('||a||')', ', '), "
" count(*)"
" FROM tabname t, pkfields"
")"
""
", idx(name, match_expr, partial, partial_alias, idx_ps, idx_idx) AS ("
" SELECT idx_name,"
" format('(%s,%s) IS (%s,%s)', "
" group_concat(i.col_expr, ', '), i_pk,"
" group_concat('o.'||i.col_alias, ', '), o_pk"
" ), "
" parse_create_index("
" (SELECT sql FROM sqlite_schema WHERE name=idx_name), -1"
" ),"
" 'cond' || row_number() OVER ()"
" , group_concat('%s', ',')"
" , group_concat('quote('||i.col_alias||')', ', ')"
" FROM tabpk t, "
" without_rowid w,"
" idx_cols i"
" WHERE i.idx_ispk==0 "
" GROUP BY idx_name"
")"
""
", wrapper_with(s) AS ("
" SELECT 'intck_wrapper AS (\n SELECT\n ' || ("
" WITH f(a, b) AS ("
" SELECT col_expr, col_alias FROM idx_cols"
" UNION ALL "
" SELECT partial, partial_alias FROM idx WHERE partial IS NOT NULL"
" )"
" SELECT group_concat(format('%s AS %s', a, b), ',\n ') FROM f"
" )"
" || format('\n FROM %Q.%Q ', t.db, t.tab)"
/* If the object being checked is a table, append "NOT INDEXED".
** Otherwise, append "INDEXED BY <index>", and then, if the index
** is a partial index " WHERE <condition>". */
" || CASE WHEN t.idx IS NULL THEN "
" 'NOT INDEXED'"
" ELSE"
" format('INDEXED BY %Q%s', t.idx, ' WHERE '||i.partial)"
" END"
" || '\n)'"
" FROM tabname t LEFT JOIN idx i ON (i.name=t.idx)"
")"
""
;
bAutoIndex = intckGetAutoIndex(p);
if( bAutoIndex ) intckExec(p, "PRAGMA automatic_index = 0");
bIsIndex = intckIsIndex(p, zObj);
if( bIsIndex ){
pStmt = intckPrepareFmt(p,
/* Table idxname contains a single row. The first column, "db", contains
** the name of the db containing the table (e.g. "main") and the second,
** "tab", the name of the table itself. */
"WITH tabname(db, tab, idx) AS ("
" SELECT %Q, (SELECT tbl_name FROM %Q.sqlite_schema WHERE name=%Q), %Q "
")"
""
", whereclause(w_c) AS (%s)"
""
"%s" /* zCommon */
""
", case_statement(c) AS ("
" SELECT "
" 'CASE WHEN (' || group_concat(col_alias, ', ') || ', 1) IS (\n' "
" || ' SELECT ' || group_concat(col_expr, ', ') || ', 1 FROM '"
" || format('%%Q.%%Q NOT INDEXED WHERE %%s\n', t.db, t.tab, p.eq_pk)"
" || ' )\n THEN NULL\n '"
" || 'ELSE format(''surplus entry ('"
" || group_concat('%%s', ',') || ',' || p.ps_pk"
" || ') in index ' || t.idx || ''', ' "
" || group_concat('quote('||i.col_alias||')', ', ') || ', ' || p.pk_pk"
" || ')'"
" || '\n END AS error_message'"
" FROM tabname t, tabpk p, idx_cols i WHERE i.idx_name=t.idx"
")"
""
", thiskey(k, n) AS ("
" SELECT group_concat(i.col_alias, ', ') || ', ' || p.o_pk, "
" count(*) + p.n_pk "
" FROM tabpk p, idx_cols i WHERE i.idx_name=p.idx"
")"
""
", main_select(m, n) AS ("
" SELECT format("
" 'WITH %%s\n' ||"
" ', idx_checker AS (\n' ||"
" ' SELECT %%s,\n' ||"
" ' %%s\n' || "
" ' FROM intck_wrapper AS o\n' ||"
" ')\n',"
" ww.s, c, t.k"
" ), t.n"
" FROM case_statement, wrapper_with ww, thiskey t"
")"
"SELECT m || "
" group_concat('SELECT * FROM idx_checker ' || w_c, ' UNION ALL '), n"
" FROM "
"main_select, whereclause "
, p->zDb, p->zDb, zObj, zObj
, zPrev ? zPrev : "VALUES('')", zCommon
);
}else{
pStmt = intckPrepareFmt(p,
/* Table tabname contains a single row. The first column, "db", contains
** the name of the db containing the table (e.g. "main") and the second,
** "tab", the name of the table itself. */
"WITH tabname(db, tab, idx, prev) AS (SELECT %Q, %Q, NULL, %Q)"
""
"%s" /* zCommon */
/* expr(e) contains one row for each index on table zObj. Value e
** is set to an expression that evaluates to NULL if the required
** entry is present in the index, or an error message otherwise. */
", expr(e, p) AS ("
" SELECT format('CASE WHEN EXISTS \n"
" (SELECT 1 FROM %%Q.%%Q AS i INDEXED BY %%Q WHERE %%s%%s)\n"
" THEN NULL\n"
" ELSE format(''entry (%%s,%%s) missing from index %%s'', %%s, %%s)\n"
" END\n'"
" , t.db, t.tab, i.name, i.match_expr, ' AND (' || partial || ')',"
" i.idx_ps, t.ps_pk, i.name, i.idx_idx, t.pk_pk),"
" CASE WHEN partial IS NULL THEN NULL ELSE i.partial_alias END"
" FROM tabpk t, idx i"
")"
", numbered(ii, cond, e) AS ("
" SELECT 0, 'n.ii=0', 'NULL'"
" UNION ALL "
" SELECT row_number() OVER (),"
" '(n.ii='||row_number() OVER ()||COALESCE(' AND '||p||')', ')'), e"
" FROM expr"
")"
", counter_with(w) AS ("
" SELECT 'WITH intck_counter(ii) AS (\n ' || "
" group_concat('SELECT '||ii, ' UNION ALL\n ') "
" || '\n)' FROM numbered"
")"
""
", case_statement(c) AS ("
" SELECT 'CASE ' || "
" group_concat(format('\n WHEN %%s THEN (%%s)', cond, e), '') ||"
" '\nEND AS error_message'"
" FROM numbered"
")"
""
/* This table contains a single row consisting of a single value -
** the text of an SQL expression that may be used by the main SQL
** statement to output an SQL literal that can be used to resume
** the scan if it is suspended. e.g. for a rowid table, an expression
** like:
**
** format('(%d,%d)', _rowid_, n.ii)
*/
", thiskey(k, n) AS ("
" SELECT o_pk || ', ii', n_pk+1 FROM tabpk"
")"
""
", whereclause(w_c) AS ("
" SELECT CASE WHEN prev!='' THEN "
" '\nWHERE (' || o_pk ||', n.ii) > ' || prev"
" ELSE ''"
" END"
" FROM tabpk, tabname"
")"
""
", main_select(m, n) AS ("
" SELECT format("
" '%%s, %%s\nSELECT %%s,\n%%s\nFROM intck_wrapper AS o"
", intck_counter AS n%%s\nORDER BY %%s', "
" w, ww.s, c, thiskey.k, whereclause.w_c, t.o_pk"
" ), thiskey.n"
" FROM case_statement, tabpk t, counter_with, "
" wrapper_with ww, thiskey, whereclause"
")"
"SELECT m, n FROM main_select",
p->zDb, zObj, zPrev, zCommon
);
}
while( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
zRet = intckStrdup(p, (const char*)sqlite3_column_text(pStmt, 0));
if( pnKeyVal ){
*pnKeyVal = sqlite3_column_int(pStmt, 1);
}
}
intckFinalize(p, pStmt);
if( bAutoIndex ) intckExec(p, "PRAGMA automatic_index = 1");
return zRet;
}
/*
** Open a new integrity-check object.
*/
int sqlite3_intck_open(
sqlite3 *db, /* Database handle to operate on */
const char *zDbArg, /* "main", "temp" etc. */
sqlite3_intck **ppOut /* OUT: New integrity-check handle */
){
sqlite3_intck *pNew = 0;
int rc = SQLITE_OK;
const char *zDb = zDbArg ? zDbArg : "main";
int nDb = strlen(zDb);
pNew = (sqlite3_intck*)sqlite3_malloc(sizeof(*pNew) + nDb + 1);
if( pNew==0 ){
rc = SQLITE_NOMEM;
}else{
sqlite3_create_function(db, "parse_create_index",
2, SQLITE_UTF8, 0, intckParseCreateIndexFunc, 0, 0
);
memset(pNew, 0, sizeof(*pNew));
pNew->db = db;
pNew->zDb = (const char*)&pNew[1];
memcpy(&pNew[1], zDb, nDb+1);
}
*ppOut = pNew;
return rc;
}
/*
** Free the integrity-check object.
*/
void sqlite3_intck_close(sqlite3_intck *p){
if( p ){
if( p->db ){
sqlite3_create_function(
p->db, "parse_create_index", 1, SQLITE_UTF8, 0, 0, 0, 0
);
}
sqlite3_free(p->zObj);
sqlite3_free(p->zKey);
sqlite3_free(p->zTestSql);
sqlite3_free(p->zErr);
sqlite3_free(p);
}
}
/*
** Step the integrity-check object.
*/
int sqlite3_intck_step(sqlite3_intck *p){
if( p->rc==SQLITE_OK ){
if( p->zMessage ){
sqlite3_free(p->zMessage);
p->zMessage = 0;
}
if( p->bCorruptSchema ){
p->rc = SQLITE_DONE;
}else
if( p->pCheck==0 ){
intckFindObject(p);
if( p->rc==SQLITE_OK ){
if( p->zObj ){
char *zSql = 0;
zSql = intckCheckObjectSql(p, p->zObj, p->zKey, &p->nKeyVal);
p->pCheck = intckPrepare(p, zSql);
sqlite3_free(zSql);
sqlite3_free(p->zKey);
p->zKey = 0;
}else{
p->rc = SQLITE_DONE;
}
}else if( p->rc==SQLITE_CORRUPT ){
p->rc = SQLITE_OK;
p->zMessage = intckStrdup(p,
"corruption found while reading database schema"
);
p->bCorruptSchema = 1;
}
}
if( p->pCheck ){
assert( p->rc==SQLITE_OK );
if( sqlite3_step(p->pCheck)==SQLITE_ROW ){
/* Normal case, do nothing. */
}else{
intckFinalize(p, p->pCheck);
p->pCheck = 0;
p->nKeyVal = 0;
if( p->rc==SQLITE_CORRUPT ){
p->rc = SQLITE_OK;
p->zMessage = intckMprintf(p,
"corruption found while scanning database object %s", p->zObj
);
}
}
}
}
return p->rc;
}
/*
** Return a message describing the corruption encountered by the most recent
** call to sqlite3_intck_step(), or NULL if no corruption was encountered.
*/
const char *sqlite3_intck_message(sqlite3_intck *p){
assert( p->pCheck==0 || p->zMessage==0 );
if( p->zMessage ){
return p->zMessage;
}
if( p->pCheck ){
return (const char*)sqlite3_column_text(p->pCheck, 0);
}
return 0;
}
/*
** Return the error code and message.
*/
int sqlite3_intck_error(sqlite3_intck *p, const char **pzErr){
if( pzErr ) *pzErr = p->zErr;
return (p->rc==SQLITE_DONE ? SQLITE_OK : p->rc);
}
/*
** Close any read transaction the integrity-check object is holding open
** on the database.
*/
int sqlite3_intck_unlock(sqlite3_intck *p){
if( p->pCheck && p->rc==SQLITE_OK ){
assert( p->zKey==0 && p->nKeyVal>0 );
intckSaveKey(p);
intckFinalize(p, p->pCheck);
p->pCheck = 0;
}
return p->rc;
}
/*
** Return the SQL statement used to check object zObj. Or, if zObj is
** NULL, the current SQL statement.
*/
const char *sqlite3_intck_test_sql(sqlite3_intck *p, const char *zObj){
sqlite3_free(p->zTestSql);
if( zObj ){
p->zTestSql = intckCheckObjectSql(p, zObj, 0, 0);
}else{
if( p->zObj ){
p->zTestSql = intckCheckObjectSql(p, p->zObj, p->zKey, 0);
}else{
sqlite3_free(p->zTestSql);
p->zTestSql = 0;
}
}
return p->zTestSql;
}
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