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sqldiff.c
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/*
** 2015-04-06
**
** 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.
**
*************************************************************************
**
** This is a utility program that computes the differences in content
** between two SQLite databases.
**
** To compile, simply link against SQLite.
**
** See the showHelp() routine below for a brief description of how to
** run the utility.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <ctype.h>
#include <string.h>
#include <assert.h>
#include "sqlite3.h"
/*
** All global variables are gathered into the "g" singleton.
*/
struct GlobalVars {
const char *zArgv0; /* Name of program */
int bSchemaOnly; /* Only show schema differences */
int bSchemaPK; /* Use the schema-defined PK, not the true PK */
unsigned fDebug; /* Debug flags */
sqlite3 *db; /* The database connection */
} g;
/*
** Allowed values for g.fDebug
*/
#define DEBUG_COLUMN_NAMES 0x000001
#define DEBUG_DIFF_SQL 0x000002
/*
** Dynamic string object
*/
typedef struct Str Str;
struct Str {
char *z; /* Text of the string */
int nAlloc; /* Bytes allocated in z[] */
int nUsed; /* Bytes actually used in z[] */
};
/*
** Initialize a Str object
*/
static void strInit(Str *p){
p->z = 0;
p->nAlloc = 0;
p->nUsed = 0;
}
/*
** Print an error resulting from faulting command-line arguments and
** abort the program.
*/
static void cmdlineError(const char *zFormat, ...){
va_list ap;
fprintf(stderr, "%s: ", g.zArgv0);
va_start(ap, zFormat);
vfprintf(stderr, zFormat, ap);
va_end(ap);
fprintf(stderr, "\n\"%s --help\" for more help\n", g.zArgv0);
exit(1);
}
/*
** Print an error message for an error that occurs at runtime, then
** abort the program.
*/
static void runtimeError(const char *zFormat, ...){
va_list ap;
fprintf(stderr, "%s: ", g.zArgv0);
va_start(ap, zFormat);
vfprintf(stderr, zFormat, ap);
va_end(ap);
fprintf(stderr, "\n");
exit(1);
}
/*
** Free all memory held by a Str object
*/
static void strFree(Str *p){
sqlite3_free(p->z);
strInit(p);
}
/*
** Add formatted text to the end of a Str object
*/
static void strPrintf(Str *p, const char *zFormat, ...){
int nNew;
for(;;){
if( p->z ){
va_list ap;
va_start(ap, zFormat);
sqlite3_vsnprintf(p->nAlloc-p->nUsed, p->z+p->nUsed, zFormat, ap);
va_end(ap);
nNew = (int)strlen(p->z + p->nUsed);
}else{
nNew = p->nAlloc;
}
if( p->nUsed+nNew < p->nAlloc-1 ){
p->nUsed += nNew;
break;
}
p->nAlloc = p->nAlloc*2 + 1000;
p->z = sqlite3_realloc(p->z, p->nAlloc);
if( p->z==0 ) runtimeError("out of memory");
}
}
/* Safely quote an SQL identifier. Use the minimum amount of transformation
** necessary to allow the string to be used with %s.
**
** Space to hold the returned string is obtained from sqlite3_malloc(). The
** caller is responsible for ensuring this space is freed when no longer
** needed.
*/
static char *safeId(const char *zId){
/* All SQLite keywords, in alphabetical order */
static const char *azKeywords[] = {
"ABORT", "ACTION", "ADD", "AFTER", "ALL", "ALTER", "ANALYZE", "AND", "AS",
"ASC", "ATTACH", "AUTOINCREMENT", "BEFORE", "BEGIN", "BETWEEN", "BY",
"CASCADE", "CASE", "CAST", "CHECK", "COLLATE", "COLUMN", "COMMIT",
"CONFLICT", "CONSTRAINT", "CREATE", "CROSS", "CURRENT_DATE",
"CURRENT_TIME", "CURRENT_TIMESTAMP", "DATABASE", "DEFAULT", "DEFERRABLE",
"DEFERRED", "DELETE", "DESC", "DETACH", "DISTINCT", "DROP", "EACH",
"ELSE", "END", "ESCAPE", "EXCEPT", "EXCLUSIVE", "EXISTS", "EXPLAIN",
"FAIL", "FOR", "FOREIGN", "FROM", "FULL", "GLOB", "GROUP", "HAVING", "IF",
"IGNORE", "IMMEDIATE", "IN", "INDEX", "INDEXED", "INITIALLY", "INNER",
"INSERT", "INSTEAD", "INTERSECT", "INTO", "IS", "ISNULL", "JOIN", "KEY",
"LEFT", "LIKE", "LIMIT", "MATCH", "NATURAL", "NO", "NOT", "NOTNULL",
"NULL", "OF", "OFFSET", "ON", "OR", "ORDER", "OUTER", "PLAN", "PRAGMA",
"PRIMARY", "QUERY", "RAISE", "RECURSIVE", "REFERENCES", "REGEXP",
"REINDEX", "RELEASE", "RENAME", "REPLACE", "RESTRICT", "RIGHT",
"ROLLBACK", "ROW", "SAVEPOINT", "SELECT", "SET", "TABLE", "TEMP",
"TEMPORARY", "THEN", "TO", "TRANSACTION", "TRIGGER", "UNION", "UNIQUE",
"UPDATE", "USING", "VACUUM", "VALUES", "VIEW", "VIRTUAL", "WHEN", "WHERE",
"WITH", "WITHOUT",
};
int lwr, upr, mid, c, i, x;
if( zId[0]==0 ) return sqlite3_mprintf("\"\"");
for(i=x=0; (c = zId[i])!=0; i++){
if( !isalpha(c) && c!='_' ){
if( i>0 && isdigit(c) ){
x++;
}else{
return sqlite3_mprintf("\"%w\"", zId);
}
}
}
if( x ) return sqlite3_mprintf("%s", zId);
lwr = 0;
upr = sizeof(azKeywords)/sizeof(azKeywords[0]) - 1;
while( lwr<=upr ){
mid = (lwr+upr)/2;
c = sqlite3_stricmp(azKeywords[mid], zId);
if( c==0 ) return sqlite3_mprintf("\"%w\"", zId);
if( c<0 ){
lwr = mid+1;
}else{
upr = mid-1;
}
}
return sqlite3_mprintf("%s", zId);
}
/*
** Prepare a new SQL statement. Print an error and abort if anything
** goes wrong.
*/
static sqlite3_stmt *db_vprepare(const char *zFormat, va_list ap){
char *zSql;
int rc;
sqlite3_stmt *pStmt;
zSql = sqlite3_vmprintf(zFormat, ap);
if( zSql==0 ) runtimeError("out of memory");
rc = sqlite3_prepare_v2(g.db, zSql, -1, &pStmt, 0);
if( rc ){
runtimeError("SQL statement error: %s\n\"%s\"", sqlite3_errmsg(g.db),
zSql);
}
sqlite3_free(zSql);
return pStmt;
}
static sqlite3_stmt *db_prepare(const char *zFormat, ...){
va_list ap;
sqlite3_stmt *pStmt;
va_start(ap, zFormat);
pStmt = db_vprepare(zFormat, ap);
va_end(ap);
return pStmt;
}
/*
** Free a list of strings
*/
static void namelistFree(char **az){
if( az ){
int i;
for(i=0; az[i]; i++) sqlite3_free(az[i]);
sqlite3_free(az);
}
}
/*
** Return a list of column names for the table zDb.zTab. Space to
** hold the list is obtained from sqlite3_malloc() and should released
** using namelistFree() when no longer needed.
**
** Primary key columns are listed first, followed by data columns.
** The number of columns in the primary key is returned in *pnPkey.
**
** Normally, the "primary key" in the previous sentence is the true
** primary key - the rowid or INTEGER PRIMARY KEY for ordinary tables
** or the declared PRIMARY KEY for WITHOUT ROWID tables. However, if
** the g.bSchemaPK flag is set, then the schema-defined PRIMARY KEY is
** used in all cases. In that case, entries that have NULL values in
** any of their primary key fields will be excluded from the analysis.
**
** If the primary key for a table is the rowid but rowid is inaccessible,
** then this routine returns a NULL pointer.
**
** Examples:
** CREATE TABLE t1(a INT UNIQUE, b INTEGER, c TEXT, PRIMARY KEY(c));
** *pnPKey = 1;
** az = { "rowid", "a", "b", "c", 0 } // Normal case
** az = { "c", "a", "b", 0 } // g.bSchemaPK==1
**
** CREATE TABLE t2(a INT UNIQUE, b INTEGER, c TEXT, PRIMARY KEY(b));
** *pnPKey = 1;
** az = { "b", "a", "c", 0 }
**
** CREATE TABLE t3(x,y,z,PRIMARY KEY(y,z));
** *pnPKey = 1 // Normal case
** az = { "rowid", "x", "y", "z", 0 } // Normal case
** *pnPKey = 2 // g.bSchemaPK==1
** az = { "y", "x", "z", 0 } // g.bSchemaPK==1
**
** CREATE TABLE t4(x,y,z,PRIMARY KEY(y,z)) WITHOUT ROWID;
** *pnPKey = 2
** az = { "y", "z", "x", 0 }
**
** CREATE TABLE t5(rowid,_rowid_,oid);
** az = 0 // The rowid is not accessible
*/
static char **columnNames(
const char *zDb, /* Database ("main" or "aux") to query */
const char *zTab, /* Name of table to return details of */
int *pnPKey, /* OUT: Number of PK columns */
int *pbRowid /* OUT: True if PK is an implicit rowid */
){
char **az = 0; /* List of column names to be returned */
int naz = 0; /* Number of entries in az[] */
sqlite3_stmt *pStmt; /* SQL statement being run */
char *zPkIdxName = 0; /* Name of the PRIMARY KEY index */
int truePk = 0; /* PRAGMA table_info indentifies the PK to use */
int nPK = 0; /* Number of PRIMARY KEY columns */
int i, j; /* Loop counters */
if( g.bSchemaPK==0 ){
/* Normal case: Figure out what the true primary key is for the table.
** * For WITHOUT ROWID tables, the true primary key is the same as
** the schema PRIMARY KEY, which is guaranteed to be present.
** * For rowid tables with an INTEGER PRIMARY KEY, the true primary
** key is the INTEGER PRIMARY KEY.
** * For all other rowid tables, the rowid is the true primary key.
*/
pStmt = db_prepare("PRAGMA %s.index_list=%Q", zDb, zTab);
while( SQLITE_ROW==sqlite3_step(pStmt) ){
if( sqlite3_stricmp((const char*)sqlite3_column_text(pStmt,3),"pk")==0 ){
zPkIdxName = sqlite3_mprintf("%s", sqlite3_column_text(pStmt, 1));
break;
}
}
sqlite3_finalize(pStmt);
if( zPkIdxName ){
int nKey = 0;
int nCol = 0;
truePk = 0;
pStmt = db_prepare("PRAGMA %s.index_xinfo=%Q", zDb, zPkIdxName);
while( SQLITE_ROW==sqlite3_step(pStmt) ){
nCol++;
if( sqlite3_column_int(pStmt,5) ){ nKey++; continue; }
if( sqlite3_column_int(pStmt,1)>=0 ) truePk = 1;
}
if( nCol==nKey ) truePk = 1;
if( truePk ){
nPK = nKey;
}else{
nPK = 1;
}
sqlite3_finalize(pStmt);
sqlite3_free(zPkIdxName);
}else{
truePk = 1;
nPK = 1;
}
pStmt = db_prepare("PRAGMA %s.table_info=%Q", zDb, zTab);
}else{
/* The g.bSchemaPK==1 case: Use whatever primary key is declared
** in the schema. The "rowid" will still be used as the primary key
** if the table definition does not contain a PRIMARY KEY.
*/
nPK = 0;
pStmt = db_prepare("PRAGMA %s.table_info=%Q", zDb, zTab);
while( SQLITE_ROW==sqlite3_step(pStmt) ){
if( sqlite3_column_int(pStmt,5)>0 ) nPK++;
}
sqlite3_reset(pStmt);
if( nPK==0 ) nPK = 1;
truePk = 1;
}
*pnPKey = nPK;
naz = nPK;
az = sqlite3_malloc( sizeof(char*)*(nPK+1) );
if( az==0 ) runtimeError("out of memory");
memset(az, 0, sizeof(char*)*(nPK+1));
while( SQLITE_ROW==sqlite3_step(pStmt) ){
int iPKey;
if( truePk && (iPKey = sqlite3_column_int(pStmt,5))>0 ){
az[iPKey-1] = safeId((char*)sqlite3_column_text(pStmt,1));
}else{
az = sqlite3_realloc(az, sizeof(char*)*(naz+2) );
if( az==0 ) runtimeError("out of memory");
az[naz++] = safeId((char*)sqlite3_column_text(pStmt,1));
}
}
sqlite3_finalize(pStmt);
if( az ) az[naz] = 0;
/* If it is non-NULL, set *pbRowid to indicate whether or not the PK of
** this table is an implicit rowid (*pbRowid==1) or not (*pbRowid==0). */
if( pbRowid ) *pbRowid = (az[0]==0);
/* If this table has an implicit rowid for a PK, figure out how to refer
** to it. There are three options - "rowid", "_rowid_" and "oid". Any
** of these will work, unless the table has an explicit column of the
** same name. */
if( az[0]==0 ){
const char *azRowid[] = { "rowid", "_rowid_", "oid" };
for(i=0; i<sizeof(azRowid)/sizeof(azRowid[0]); i++){
for(j=1; j<naz; j++){
if( sqlite3_stricmp(az[j], azRowid[i])==0 ) break;
}
if( j>=naz ){
az[0] = sqlite3_mprintf("%s", azRowid[i]);
break;
}
}
if( az[0]==0 ){
for(i=1; i<naz; i++) sqlite3_free(az[i]);
sqlite3_free(az);
az = 0;
}
}
return az;
}
/*
** Print the sqlite3_value X as an SQL literal.
*/
static void printQuoted(FILE *out, sqlite3_value *X){
switch( sqlite3_value_type(X) ){
case SQLITE_FLOAT: {
double r1;
char zBuf[50];
r1 = sqlite3_value_double(X);
sqlite3_snprintf(sizeof(zBuf), zBuf, "%!.15g", r1);
fprintf(out, "%s", zBuf);
break;
}
case SQLITE_INTEGER: {
fprintf(out, "%lld", sqlite3_value_int64(X));
break;
}
case SQLITE_BLOB: {
const unsigned char *zBlob = sqlite3_value_blob(X);
int nBlob = sqlite3_value_bytes(X);
if( zBlob ){
int i;
fprintf(out, "x'");
for(i=0; i<nBlob; i++){
fprintf(out, "%02x", zBlob[i]);
}
fprintf(out, "'");
}else{
fprintf(out, "NULL");
}
break;
}
case SQLITE_TEXT: {
const unsigned char *zArg = sqlite3_value_text(X);
int i, j;
if( zArg==0 ){
fprintf(out, "NULL");
}else{
fprintf(out, "'");
for(i=j=0; zArg[i]; i++){
if( zArg[i]=='\'' ){
fprintf(out, "%.*s'", i-j+1, &zArg[j]);
j = i+1;
}
}
fprintf(out, "%s'", &zArg[j]);
}
break;
}
case SQLITE_NULL: {
fprintf(out, "NULL");
break;
}
}
}
/*
** Output SQL that will recreate the aux.zTab table.
*/
static void dump_table(const char *zTab, FILE *out){
char *zId = safeId(zTab); /* Name of the table */
char **az = 0; /* List of columns */
int nPk; /* Number of true primary key columns */
int nCol; /* Number of data columns */
int i; /* Loop counter */
sqlite3_stmt *pStmt; /* SQL statement */
const char *zSep; /* Separator string */
Str ins; /* Beginning of the INSERT statement */
pStmt = db_prepare("SELECT sql FROM aux.sqlite_master WHERE name=%Q", zTab);
if( SQLITE_ROW==sqlite3_step(pStmt) ){
fprintf(out, "%s;\n", sqlite3_column_text(pStmt,0));
}
sqlite3_finalize(pStmt);
if( !g.bSchemaOnly ){
az = columnNames("aux", zTab, &nPk, 0);
strInit(&ins);
if( az==0 ){
pStmt = db_prepare("SELECT * FROM aux.%s", zId);
strPrintf(&ins,"INSERT INTO %s VALUES", zId);
}else{
Str sql;
strInit(&sql);
zSep = "SELECT";
for(i=0; az[i]; i++){
strPrintf(&sql, "%s %s", zSep, az[i]);
zSep = ",";
}
strPrintf(&sql," FROM aux.%s", zId);
zSep = " ORDER BY";
for(i=1; i<=nPk; i++){
strPrintf(&sql, "%s %d", zSep, i);
zSep = ",";
}
pStmt = db_prepare("%s", sql.z);
strFree(&sql);
strPrintf(&ins, "INSERT INTO %s", zId);
zSep = "(";
for(i=0; az[i]; i++){
strPrintf(&ins, "%s%s", zSep, az[i]);
zSep = ",";
}
strPrintf(&ins,") VALUES");
namelistFree(az);
}
nCol = sqlite3_column_count(pStmt);
while( SQLITE_ROW==sqlite3_step(pStmt) ){
fprintf(out, "%s",ins.z);
zSep = "(";
for(i=0; i<nCol; i++){
fprintf(out, "%s",zSep);
printQuoted(out, sqlite3_column_value(pStmt,i));
zSep = ",";
}
fprintf(out, ");\n");
}
sqlite3_finalize(pStmt);
strFree(&ins);
} /* endif !g.bSchemaOnly */
pStmt = db_prepare("SELECT sql FROM aux.sqlite_master"
" WHERE type='index' AND tbl_name=%Q AND sql IS NOT NULL",
zTab);
while( SQLITE_ROW==sqlite3_step(pStmt) ){
fprintf(out, "%s;\n", sqlite3_column_text(pStmt,0));
}
sqlite3_finalize(pStmt);
}
/*
** Compute all differences for a single table.
*/
static void diff_one_table(const char *zTab, FILE *out){
char *zId = safeId(zTab); /* Name of table (translated for us in SQL) */
char **az = 0; /* Columns in main */
char **az2 = 0; /* Columns in aux */
int nPk; /* Primary key columns in main */
int nPk2; /* Primary key columns in aux */
int n = 0; /* Number of columns in main */
int n2; /* Number of columns in aux */
int nQ; /* Number of output columns in the diff query */
int i; /* Loop counter */
const char *zSep; /* Separator string */
Str sql; /* Comparison query */
sqlite3_stmt *pStmt; /* Query statement to do the diff */
strInit(&sql);
if( g.fDebug==DEBUG_COLUMN_NAMES ){
/* Simply run columnNames() on all tables of the origin
** database and show the results. This is used for testing
** and debugging of the columnNames() function.
*/
az = columnNames("aux",zTab, &nPk, 0);
if( az==0 ){
printf("Rowid not accessible for %s\n", zId);
}else{
printf("%s:", zId);
for(i=0; az[i]; i++){
printf(" %s", az[i]);
if( i+1==nPk ) printf(" *");
}
printf("\n");
}
goto end_diff_one_table;
}
if( sqlite3_table_column_metadata(g.db,"aux",zTab,0,0,0,0,0,0) ){
if( !sqlite3_table_column_metadata(g.db,"main",zTab,0,0,0,0,0,0) ){
/* Table missing from second database. */
fprintf(out, "DROP TABLE %s;\n", zId);
}
goto end_diff_one_table;
}
if( sqlite3_table_column_metadata(g.db,"main",zTab,0,0,0,0,0,0) ){
/* Table missing from source */
dump_table(zTab, out);
goto end_diff_one_table;
}
az = columnNames("main", zTab, &nPk, 0);
az2 = columnNames("aux", zTab, &nPk2, 0);
if( az && az2 ){
for(n=0; az[n] && az2[n]; n++){
if( sqlite3_stricmp(az[n],az2[n])!=0 ) break;
}
}
if( az==0
|| az2==0
|| nPk!=nPk2
|| az[n]
){
/* Schema mismatch */
fprintf(out, "DROP TABLE %s; -- due to schema mismatch\n", zId);
dump_table(zTab, out);
goto end_diff_one_table;
}
/* Build the comparison query */
for(n2=n; az2[n2]; n2++){
fprintf(out, "ALTER TABLE %s ADD COLUMN %s;\n", zId, safeId(az2[n2]));
}
nQ = nPk2+1+2*(n2-nPk2);
if( n2>nPk2 ){
zSep = "SELECT ";
for(i=0; i<nPk; i++){
strPrintf(&sql, "%sB.%s", zSep, az[i]);
zSep = ", ";
}
strPrintf(&sql, ", 1%s -- changed row\n", nPk==n ? "" : ",");
while( az[i] ){
strPrintf(&sql, " A.%s IS NOT B.%s, B.%s%s\n",
az[i], az2[i], az2[i], az2[i+1]==0 ? "" : ",");
i++;
}
while( az2[i] ){
strPrintf(&sql, " B.%s IS NOT NULL, B.%s%s\n",
az2[i], az2[i], az2[i+1]==0 ? "" : ",");
i++;
}
strPrintf(&sql, " FROM main.%s A, aux.%s B\n", zId, zId);
zSep = " WHERE";
for(i=0; i<nPk; i++){
strPrintf(&sql, "%s A.%s=B.%s", zSep, az[i], az[i]);
zSep = " AND";
}
zSep = "\n AND (";
while( az[i] ){
strPrintf(&sql, "%sA.%s IS NOT B.%s%s\n",
zSep, az[i], az2[i], az2[i+1]==0 ? ")" : "");
zSep = " OR ";
i++;
}
while( az2[i] ){
strPrintf(&sql, "%sB.%s IS NOT NULL%s\n",
zSep, az2[i], az2[i+1]==0 ? ")" : "");
zSep = " OR ";
i++;
}
strPrintf(&sql, " UNION ALL\n");
}
zSep = "SELECT ";
for(i=0; i<nPk; i++){
strPrintf(&sql, "%sA.%s", zSep, az[i]);
zSep = ", ";
}
strPrintf(&sql, ", 2%s -- deleted row\n", nPk==n ? "" : ",");
while( az2[i] ){
strPrintf(&sql, " NULL, NULL%s\n", i==n2-1 ? "" : ",");
i++;
}
strPrintf(&sql, " FROM main.%s A\n", zId);
strPrintf(&sql, " WHERE NOT EXISTS(SELECT 1 FROM aux.%s B\n", zId);
zSep = " WHERE";
for(i=0; i<nPk; i++){
strPrintf(&sql, "%s A.%s=B.%s", zSep, az[i], az[i]);
zSep = " AND";
}
strPrintf(&sql, ")\n");
zSep = " UNION ALL\nSELECT ";
for(i=0; i<nPk; i++){
strPrintf(&sql, "%sB.%s", zSep, az[i]);
zSep = ", ";
}
strPrintf(&sql, ", 3%s -- inserted row\n", nPk==n ? "" : ",");
while( az2[i] ){
strPrintf(&sql, " 1, B.%s%s\n", az2[i], az2[i+1]==0 ? "" : ",");
i++;
}
strPrintf(&sql, " FROM aux.%s B\n", zId);
strPrintf(&sql, " WHERE NOT EXISTS(SELECT 1 FROM main.%s A\n", zId);
zSep = " WHERE";
for(i=0; i<nPk; i++){
strPrintf(&sql, "%s A.%s=B.%s", zSep, az[i], az[i]);
zSep = " AND";
}
strPrintf(&sql, ")\n ORDER BY");
zSep = " ";
for(i=1; i<=nPk; i++){
strPrintf(&sql, "%s%d", zSep, i);
zSep = ", ";
}
strPrintf(&sql, ";\n");
if( g.fDebug & DEBUG_DIFF_SQL ){
printf("SQL for %s:\n%s\n", zId, sql.z);
goto end_diff_one_table;
}
/* Drop indexes that are missing in the destination */
pStmt = db_prepare(
"SELECT name FROM main.sqlite_master"
" WHERE type='index' AND tbl_name=%Q"
" AND sql IS NOT NULL"
" AND sql NOT IN (SELECT sql FROM aux.sqlite_master"
" WHERE type='index' AND tbl_name=%Q"
" AND sql IS NOT NULL)",
zTab, zTab);
while( SQLITE_ROW==sqlite3_step(pStmt) ){
char *z = safeId((const char*)sqlite3_column_text(pStmt,0));
fprintf(out, "DROP INDEX %s;\n", z);
sqlite3_free(z);
}
sqlite3_finalize(pStmt);
/* Run the query and output differences */
if( !g.bSchemaOnly ){
pStmt = db_prepare(sql.z);
while( SQLITE_ROW==sqlite3_step(pStmt) ){
int iType = sqlite3_column_int(pStmt, nPk);
if( iType==1 || iType==2 ){
if( iType==1 ){ /* Change the content of a row */
fprintf(out, "UPDATE %s", zId);
zSep = " SET";
for(i=nPk+1; i<nQ; i+=2){
if( sqlite3_column_int(pStmt,i)==0 ) continue;
fprintf(out, "%s %s=", zSep, az2[(i+nPk-1)/2]);
zSep = ",";
printQuoted(out, sqlite3_column_value(pStmt,i+1));
}
}else{ /* Delete a row */
fprintf(out, "DELETE FROM %s", zId);
}
zSep = " WHERE";
for(i=0; i<nPk; i++){
fprintf(out, "%s %s=", zSep, az2[i]);
printQuoted(out, sqlite3_column_value(pStmt,i));
zSep = " AND";
}
fprintf(out, ";\n");
}else{ /* Insert a row */
fprintf(out, "INSERT INTO %s(%s", zId, az2[0]);
for(i=1; az2[i]; i++) fprintf(out, ",%s", az2[i]);
fprintf(out, ") VALUES");
zSep = "(";
for(i=0; i<nPk2; i++){
fprintf(out, "%s", zSep);
zSep = ",";
printQuoted(out, sqlite3_column_value(pStmt,i));
}
for(i=nPk2+2; i<nQ; i+=2){
fprintf(out, ",");
printQuoted(out, sqlite3_column_value(pStmt,i));
}
fprintf(out, ");\n");
}
}
sqlite3_finalize(pStmt);
} /* endif !g.bSchemaOnly */
/* Create indexes that are missing in the source */
pStmt = db_prepare(
"SELECT sql FROM aux.sqlite_master"
" WHERE type='index' AND tbl_name=%Q"
" AND sql IS NOT NULL"
" AND sql NOT IN (SELECT sql FROM main.sqlite_master"
" WHERE type='index' AND tbl_name=%Q"
" AND sql IS NOT NULL)",
zTab, zTab);
while( SQLITE_ROW==sqlite3_step(pStmt) ){
fprintf(out, "%s;\n", sqlite3_column_text(pStmt,0));
}
sqlite3_finalize(pStmt);
end_diff_one_table:
strFree(&sql);
sqlite3_free(zId);
namelistFree(az);
namelistFree(az2);
return;
}
/*
** Check that table zTab exists and has the same schema in both the "main"
** and "aux" databases currently opened by the global db handle. If they
** do not, output an error message on stderr and exit(1). Otherwise, if
** the schemas do match, return control to the caller.
*/
static void checkSchemasMatch(const char *zTab){
sqlite3_stmt *pStmt = db_prepare(
"SELECT A.sql=B.sql FROM main.sqlite_master A, aux.sqlite_master B"
" WHERE A.name=%Q AND B.name=%Q", zTab, zTab
);
if( SQLITE_ROW==sqlite3_step(pStmt) ){
if( sqlite3_column_int(pStmt,0)==0 ){
runtimeError("schema changes for table %s", safeId(zTab));
}
}else{
runtimeError("table %s missing from one or both databases", safeId(zTab));
}
sqlite3_finalize(pStmt);
}
/**************************************************************************
** The following code is copied from fossil. It is used to generate the
** fossil delta blobs sometimes used in RBU update records.
*/
typedef unsigned short u16;
typedef unsigned int u32;
typedef unsigned char u8;
/*
** The width of a hash window in bytes. The algorithm only works if this
** is a power of 2.
*/
#define NHASH 16
/*
** The current state of the rolling hash.
**
** z[] holds the values that have been hashed. z[] is a circular buffer.
** z[i] is the first entry and z[(i+NHASH-1)%NHASH] is the last entry of
** the window.
**
** Hash.a is the sum of all elements of hash.z[]. Hash.b is a weighted
** sum. Hash.b is z[i]*NHASH + z[i+1]*(NHASH-1) + ... + z[i+NHASH-1]*1.
** (Each index for z[] should be module NHASH, of course. The %NHASH operator
** is omitted in the prior expression for brevity.)
*/
typedef struct hash hash;
struct hash {
u16 a, b; /* Hash values */
u16 i; /* Start of the hash window */
char z[NHASH]; /* The values that have been hashed */
};
/*
** Initialize the rolling hash using the first NHASH characters of z[]
*/
static void hash_init(hash *pHash, const char *z){
u16 a, b, i;
a = b = 0;
for(i=0; i<NHASH; i++){
a += z[i];
b += (NHASH-i)*z[i];
pHash->z[i] = z[i];
}
pHash->a = a & 0xffff;
pHash->b = b & 0xffff;
pHash->i = 0;
}
/*
** Advance the rolling hash by a single character "c"
*/
static void hash_next(hash *pHash, int c){
u16 old = pHash->z[pHash->i];
pHash->z[pHash->i] = (char)c;
pHash->i = (pHash->i+1)&(NHASH-1);
pHash->a = pHash->a - old + (char)c;
pHash->b = pHash->b - NHASH*old + pHash->a;
}
/*
** Return a 32-bit hash value
*/
static u32 hash_32bit(hash *pHash){
return (pHash->a & 0xffff) | (((u32)(pHash->b & 0xffff))<<16);
}
/*
** Write an base-64 integer into the given buffer.
*/
static void putInt(unsigned int v, char **pz){
static const char zDigits[] =
"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz~";
/* 123456789 123456789 123456789 123456789 123456789 123456789 123 */
int i, j;
char zBuf[20];
if( v==0 ){
*(*pz)++ = '0';
return;
}
for(i=0; v>0; i++, v>>=6){
zBuf[i] = zDigits[v&0x3f];
}
for(j=i-1; j>=0; j--){
*(*pz)++ = zBuf[j];
}
}
/*
** Return the number digits in the base-64 representation of a positive integer
*/
static int digit_count(int v){
unsigned int i, x;
for(i=1, x=64; (unsigned int)v>=x; i++, x <<= 6){}
return i;
}
/*
** Compute a 32-bit checksum on the N-byte buffer. Return the result.
*/
static unsigned int checksum(const char *zIn, size_t N){
const unsigned char *z = (const unsigned char *)zIn;
unsigned sum0 = 0;
unsigned sum1 = 0;
unsigned sum2 = 0;
unsigned sum3 = 0;
while(N >= 16){
sum0 += ((unsigned)z[0] + z[4] + z[8] + z[12]);
sum1 += ((unsigned)z[1] + z[5] + z[9] + z[13]);
sum2 += ((unsigned)z[2] + z[6] + z[10]+ z[14]);
sum3 += ((unsigned)z[3] + z[7] + z[11]+ z[15]);
z += 16;
N -= 16;
}
while(N >= 4){
sum0 += z[0];
sum1 += z[1];
sum2 += z[2];
sum3 += z[3];
z += 4;
N -= 4;
}
sum3 += (sum2 << 8) + (sum1 << 16) + (sum0 << 24);
switch(N){
case 3: sum3 += (z[2] << 8);
case 2: sum3 += (z[1] << 16);
case 1: sum3 += (z[0] << 24);
default: ;
}
return sum3;
}
/*
** Create a new delta.
**
** The delta is written into a preallocated buffer, zDelta, which
** should be at least 60 bytes longer than the target file, zOut.
** The delta string will be NUL-terminated, but it might also contain
** embedded NUL characters if either the zSrc or zOut files are
** binary. This function returns the length of the delta string
** in bytes, excluding the final NUL terminator character.
**
** Output Format:
**
** The delta begins with a base64 number followed by a newline. This
** number is the number of bytes in the TARGET file. Thus, given a
** delta file z, a program can compute the size of the output file
** simply by reading the first line and decoding the base-64 number
** found there. The delta_output_size() routine does exactly this.
**
** After the initial size number, the delta consists of a series of
** literal text segments and commands to copy from the SOURCE file.
** A copy command looks like this:
**
** NNN@MMM,
**
** where NNN is the number of bytes to be copied and MMM is the offset
** into the source file of the first byte (both base-64). If NNN is 0
** it means copy the rest of the input file. Literal text is like this:
**
** NNN:TTTTT
**
** where NNN is the number of bytes of text (base-64) and TTTTT is the text.
**
** The last term is of the form
**
** NNN;
**
** In this case, NNN is a 32-bit bigendian checksum of the output file
** that can be used to verify that the delta applied correctly. All
** numbers are in base-64.
**
** Pure text files generate a pure text delta. Binary files generate a
** delta that may contain some binary data.
**
** Algorithm:
**
** The encoder first builds a hash table to help it find matching
** patterns in the source file. 16-byte chunks of the source file
** sampled at evenly spaced intervals are used to populate the hash
** table.
**
** Next we begin scanning the target file using a sliding 16-byte
** window. The hash of the 16-byte window in the target is used to
** search for a matching section in the source file. When a match
** is found, a copy command is added to the delta. An effort is
** made to extend the matching section to regions that come before
** and after the 16-byte hash window. A copy command is only issued
** if the result would use less space that just quoting the text
** literally. Literal text is added to the delta for sections that
** do not match or which can not be encoded efficiently using copy
** commands.
*/
static int rbuDeltaCreate(
const char *zSrc, /* The source or pattern file */
unsigned int lenSrc, /* Length of the source file */
const char *zOut, /* The target file */
unsigned int lenOut, /* Length of the target file */
char *zDelta /* Write the delta into this buffer */
){
unsigned int i, base;
char *zOrigDelta = zDelta;
hash h;
int nHash; /* Number of hash table entries */
int *landmark; /* Primary hash table */
int *collide; /* Collision chain */
int lastRead = -1; /* Last byte of zSrc read by a COPY command */
/* Add the target file size to the beginning of the delta
*/
putInt(lenOut, &zDelta);
*(zDelta++) = '\n';
/* If the source file is very small, it means that we have no
** chance of ever doing a copy command. Just output a single
** literal segment for the entire target and exit.
*/
if( lenSrc<=NHASH ){
putInt(lenOut, &zDelta);
*(zDelta++) = ':';
memcpy(zDelta, zOut, lenOut);
zDelta += lenOut;
putInt(checksum(zOut, lenOut), &zDelta);
*(zDelta++) = ';';
return (int)(zDelta - zOrigDelta);
}
/* Compute the hash table used to locate matching sections in the