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Add the 'genfkey' functionality to the sqlite3 shell. Accessed using a new dot-command - ".genfkey". (CVS 6325)

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FossilOrigin-Name: 0a59fb28b46e5d85c850d1dfa1385a4656e4dda5
This commit is contained in:
danielk1977
2009-02-25 15:22:02 +00:00
parent 02f33725d2
commit c8c7069035
4 changed files with 928 additions and 13 deletions
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14
manifest
View File

@@ -1,5 +1,5 @@
C Minor\schanges\sand\scoverge\stests\sfor\s"SELECT\scount(*)"\soptimization.\s(CVS\s6324) C Add\sthe\s'genfkey'\sfunctionality\sto\sthe\ssqlite3\sshell.\sAccessed\susing\sa\snew\sdot-command\s-\s".genfkey".\s(CVS\s6325)
D 2009-02-25T08:56:47 D 2009-02-25T15:22:03
F Makefile.arm-wince-mingw32ce-gcc fcd5e9cd67fe88836360bb4f9ef4cb7f8e2fb5a0 F Makefile.arm-wince-mingw32ce-gcc fcd5e9cd67fe88836360bb4f9ef4cb7f8e2fb5a0
F Makefile.in d64baddbf55cdf33ff030e14da837324711a4ef7 F Makefile.in d64baddbf55cdf33ff030e14da837324711a4ef7
F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654 F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
@@ -155,7 +155,7 @@ F src/random.c 676b9d7ac820fe81e6fb2394ac8c10cff7f38628
F src/resolve.c dea005135845acbbfae1f2968c0deb6b2e3d580c F src/resolve.c dea005135845acbbfae1f2968c0deb6b2e3d580c
F src/rowset.c ba9375f37053d422dd76965a9c370a13b6e1aac4 F src/rowset.c ba9375f37053d422dd76965a9c370a13b6e1aac4
F src/select.c 4d0b77fd76ff80f09a798ee98953e344c9de8fbb F src/select.c 4d0b77fd76ff80f09a798ee98953e344c9de8fbb
F src/shell.c f109ebbb50132926ebbc173a6c2d8838d5d78527 F src/shell.c 95ca116d855f912960326054275ec21429b074ca
F src/sqlite.h.in 14f4d065bafed8500ea558a75a8e2be89c784d61 F src/sqlite.h.in 14f4d065bafed8500ea558a75a8e2be89c784d61
F src/sqlite3ext.h 1db7d63ab5de4b3e6b83dd03d1a4e64fef6d2a17 F src/sqlite3ext.h 1db7d63ab5de4b3e6b83dd03d1a4e64fef6d2a17
F src/sqliteInt.h e717d30828600865b8f74456fd461e6a52ead6df F src/sqliteInt.h e717d30828600865b8f74456fd461e6a52ead6df
@@ -682,7 +682,7 @@ F tool/diffdb.c 7524b1b5df217c20cd0431f6789851a4e0cb191b
F tool/fragck.tcl 5265a95126abcf6ab357f7efa544787e5963f439 F tool/fragck.tcl 5265a95126abcf6ab357f7efa544787e5963f439
F tool/genfkey.README 080ca2269f727fcf14c8e76d52e85d157e3a8e9a F tool/genfkey.README 080ca2269f727fcf14c8e76d52e85d157e3a8e9a
F tool/genfkey.c e1b9c93da828db10c1109c7b4fa611aec8adc407 F tool/genfkey.c e1b9c93da828db10c1109c7b4fa611aec8adc407
F tool/genfkey.test 182829596fb15785b94b2493c5f735b847d91076 F tool/genfkey.test eda48d8258f5ad7b3b258ca3323c3c4246a846f2
F tool/lemon.c 0f65442d1c99a865525658a47ddf292f4ac2ec54 F tool/lemon.c 0f65442d1c99a865525658a47ddf292f4ac2ec54
F tool/lempar.c aeba88b8566ff66f8a67c96b3eb2dd95e7d8908d F tool/lempar.c aeba88b8566ff66f8a67c96b3eb2dd95e7d8908d
F tool/mkkeywordhash.c 8e57fbe8c4fe2f1800f9190fd361231cb8558407 F tool/mkkeywordhash.c 8e57fbe8c4fe2f1800f9190fd361231cb8558407
@@ -702,7 +702,7 @@ F tool/speedtest16.c c8a9c793df96db7e4933f0852abb7a03d48f2e81
F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224 F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
P 91d9d51e03657e7492dd7b93e66c82b152abec3b P a3695b98f63fb776c3b7f77f0553e8a38bcc6f78
R c65d7c9d041d481539ec6e65a8bbfcc4 R 63fcdff1c89d9f14e0a70bd84c7c7dfe
U danielk1977 U danielk1977
Z f03589b6049282aa23f55a52edc62f1d Z 1a6ade2e3ad1357e1b9f98d287dfc555

2
manifest.uuid
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@@ -1 +1 @@
a3695b98f63fb776c3b7f77f0553e8a38bcc6f78 0a59fb28b46e5d85c850d1dfa1385a4656e4dda5

917
src/shell.c
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@@ -12,7 +12,7 @@
** This file contains code to implement the "sqlite" command line ** This file contains code to implement the "sqlite" command line
** utility for accessing SQLite databases. ** utility for accessing SQLite databases.
** **
** $Id: shell.c,v 1.201 2009/02/04 22:46:47 drh Exp $ ** $Id: shell.c,v 1.202 2009/02/25 15:22:03 danielk1977 Exp $
*/ */
#if defined(_WIN32) || defined(WIN32) #if defined(_WIN32) || defined(WIN32)
/* This needs to come before any includes for MSVC compiler */ /* This needs to come before any includes for MSVC compiler */
@@ -73,6 +73,846 @@ extern int isatty();
#include <sys/time.h> #include <sys/time.h>
#include <sys/resource.h> #include <sys/resource.h>
/**************************************************************************
***************************************************************************
** Begin genfkey logic.
*/
#if !defined(SQLITE_OMIT_VIRTUALTABLE) && !defined SQLITE_OMIT_SUBQUERY
#define GENFKEY_ERROR 1
#define GENFKEY_DROPTRIGGER 2
#define GENFKEY_CREATETRIGGER 3
static int genfkey_create_triggers(sqlite3 *, const char *, void *,
int (*)(void *, int, const char *)
);
struct GenfkeyCb {
void *pCtx;
int eType;
int (*xData)(void *, int, const char *);
};
typedef struct GenfkeyCb GenfkeyCb;
/* The code in this file defines a sqlite3 virtual-table module that
** provides a read-only view of the current database schema. There is one
** row in the schema table for each column in the database schema.
*/
#define SCHEMA \
"CREATE TABLE x(" \
"database," /* Name of database (i.e. main, temp etc.) */ \
"tablename," /* Name of table */ \
"cid," /* Column number (from left-to-right, 0 upward) */ \
"name," /* Column name */ \
"type," /* Specified type (i.e. VARCHAR(32)) */ \
"not_null," /* Boolean. True if NOT NULL was specified */ \
"dflt_value," /* Default value for this column */ \
"pk" /* True if this column is part of the primary key */ \
")"
#define SCHEMA2 \
"CREATE TABLE x(" \
"database," /* Name of database (i.e. main, temp etc.) */ \
"from_tbl," /* Name of table */ \
"fkid," \
"seq," \
"to_tbl," \
"from_col," \
"to_col," \
"on_update," \
"on_delete," \
"match" \
")"
#define SCHEMA3 \
"CREATE TABLE x(" \
"database," /* Name of database (i.e. main, temp etc.) */ \
"tablename," /* Name of table */ \
"seq," \
"name," \
"isunique" \
")"
#define SCHEMA4 \
"CREATE TABLE x(" \
"database," /* Name of database (i.e. main, temp etc.) */ \
"indexname," /* Name of table */ \
"seqno," \
"cid," \
"name" \
")"
#define SCHEMA5 \
"CREATE TABLE x(" \
"database," /* Name of database (i.e. main, temp etc.) */ \
"triggername," /* Name of trigger */ \
"dummy" /* Unused */ \
")"
typedef struct SchemaTable SchemaTable;
struct SchemaTable {
const char *zName;
const char *zObject;
const char *zPragma;
const char *zSchema;
} aSchemaTable[] = {
{ "table_info", "table", "PRAGMA %Q.table_info(%Q)", SCHEMA },
{ "foreign_key_list", "table", "PRAGMA %Q.foreign_key_list(%Q)", SCHEMA2 },
{ "index_list", "table", "PRAGMA %Q.index_list(%Q)", SCHEMA3 },
{ "index_info", "index", "PRAGMA %Q.index_info(%Q)", SCHEMA4 },
{ "trigger_list", "trigger", "SELECT 1", SCHEMA5 },
{ 0, 0, 0, 0 }
};
typedef struct schema_vtab schema_vtab;
typedef struct schema_cursor schema_cursor;
/* A schema table object */
struct schema_vtab {
sqlite3_vtab base;
sqlite3 *db;
SchemaTable *pType;
};
/* A schema table cursor object */
struct schema_cursor {
sqlite3_vtab_cursor base;
sqlite3_stmt *pDbList;
sqlite3_stmt *pTableList;
sqlite3_stmt *pColumnList;
int rowid;
};
/*
** Table destructor for the schema module.
*/
static int schemaDestroy(sqlite3_vtab *pVtab){
sqlite3_free(pVtab);
return 0;
}
/*
** Table constructor for the schema module.
*/
static int schemaCreate(
sqlite3 *db,
void *pAux,
int argc, const char *const*argv,
sqlite3_vtab **ppVtab,
char **pzErr
){
int rc = SQLITE_NOMEM;
schema_vtab *pVtab;
SchemaTable *pType = &aSchemaTable[0];
if( argc>3 ){
int i;
pType = 0;
for(i=0; aSchemaTable[i].zName; i++){
if( 0==strcmp(argv[3], aSchemaTable[i].zName) ){
pType = &aSchemaTable[i];
}
}
if( !pType ){
return SQLITE_ERROR;
}
}
pVtab = sqlite3_malloc(sizeof(schema_vtab));
if( pVtab ){
memset(pVtab, 0, sizeof(schema_vtab));
pVtab->db = (sqlite3 *)pAux;
pVtab->pType = pType;
rc = sqlite3_declare_vtab(db, pType->zSchema);
}
*ppVtab = (sqlite3_vtab *)pVtab;
return rc;
}
/*
** Open a new cursor on the schema table.
*/
static int schemaOpen(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCursor){
int rc = SQLITE_NOMEM;
schema_cursor *pCur;
pCur = sqlite3_malloc(sizeof(schema_cursor));
if( pCur ){
memset(pCur, 0, sizeof(schema_cursor));
*ppCursor = (sqlite3_vtab_cursor *)pCur;
rc = SQLITE_OK;
}
return rc;
}
/*
** Close a schema table cursor.
*/
static int schemaClose(sqlite3_vtab_cursor *cur){
schema_cursor *pCur = (schema_cursor *)cur;
sqlite3_finalize(pCur->pDbList);
sqlite3_finalize(pCur->pTableList);
sqlite3_finalize(pCur->pColumnList);
sqlite3_free(pCur);
return SQLITE_OK;
}
static void columnToResult(sqlite3_context *ctx, sqlite3_stmt *pStmt, int iCol){
switch( sqlite3_column_type(pStmt, iCol) ){
case SQLITE_NULL:
sqlite3_result_null(ctx);
break;
case SQLITE_INTEGER:
sqlite3_result_int64(ctx, sqlite3_column_int64(pStmt, iCol));
break;
case SQLITE_FLOAT:
sqlite3_result_double(ctx, sqlite3_column_double(pStmt, iCol));
break;
case SQLITE_TEXT: {
const char *z = (const char *)sqlite3_column_text(pStmt, iCol);
sqlite3_result_text(ctx, z, -1, SQLITE_TRANSIENT);
break;
}
}
}
/*
** Retrieve a column of data.
*/
static int schemaColumn(sqlite3_vtab_cursor *cur, sqlite3_context *ctx, int i){
schema_cursor *pCur = (schema_cursor *)cur;
switch( i ){
case 0:
columnToResult(ctx, pCur->pDbList, 1);
break;
case 1:
columnToResult(ctx, pCur->pTableList, 0);
break;
default:
columnToResult(ctx, pCur->pColumnList, i-2);
break;
}
return SQLITE_OK;
}
/*
** Retrieve the current rowid.
*/
static int schemaRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
schema_cursor *pCur = (schema_cursor *)cur;
*pRowid = pCur->rowid;
return SQLITE_OK;
}
static int finalize(sqlite3_stmt **ppStmt){
int rc = sqlite3_finalize(*ppStmt);
*ppStmt = 0;
return rc;
}
static int schemaEof(sqlite3_vtab_cursor *cur){
schema_cursor *pCur = (schema_cursor *)cur;
return (pCur->pDbList ? 0 : 1);
}
/*
** Advance the cursor to the next row.
*/
static int schemaNext(sqlite3_vtab_cursor *cur){
int rc = SQLITE_OK;
schema_cursor *pCur = (schema_cursor *)cur;
schema_vtab *pVtab = (schema_vtab *)(cur->pVtab);
char *zSql = 0;
while( !pCur->pColumnList || SQLITE_ROW!=sqlite3_step(pCur->pColumnList) ){
if( SQLITE_OK!=(rc = finalize(&pCur->pColumnList)) ) goto next_exit;
while( !pCur->pTableList || SQLITE_ROW!=sqlite3_step(pCur->pTableList) ){
if( SQLITE_OK!=(rc = finalize(&pCur->pTableList)) ) goto next_exit;
assert(pCur->pDbList);
while( SQLITE_ROW!=sqlite3_step(pCur->pDbList) ){
rc = finalize(&pCur->pDbList);
goto next_exit;
}
/* Set zSql to the SQL to pull the list of tables from the
** sqlite_master (or sqlite_temp_master) table of the database
** identfied by the row pointed to by the SQL statement pCur->pDbList
** (iterating through a "PRAGMA database_list;" statement).
*/
if( sqlite3_column_int(pCur->pDbList, 0)==1 ){
zSql = sqlite3_mprintf(
"SELECT name FROM sqlite_temp_master WHERE type=%Q",
pVtab->pType->zObject
);
}else{
sqlite3_stmt *pDbList = pCur->pDbList;
zSql = sqlite3_mprintf(
"SELECT name FROM %Q.sqlite_master WHERE type=%Q",
sqlite3_column_text(pDbList, 1), pVtab->pType->zObject
);
}
if( !zSql ){
rc = SQLITE_NOMEM;
goto next_exit;
}
rc = sqlite3_prepare(pVtab->db, zSql, -1, &pCur->pTableList, 0);
sqlite3_free(zSql);
if( rc!=SQLITE_OK ) goto next_exit;
}
/* Set zSql to the SQL to the table_info pragma for the table currently
** identified by the rows pointed to by statements pCur->pDbList and
** pCur->pTableList.
*/
zSql = sqlite3_mprintf(pVtab->pType->zPragma,
sqlite3_column_text(pCur->pDbList, 1),
sqlite3_column_text(pCur->pTableList, 0)
);
if( !zSql ){
rc = SQLITE_NOMEM;
goto next_exit;
}
rc = sqlite3_prepare(pVtab->db, zSql, -1, &pCur->pColumnList, 0);
sqlite3_free(zSql);
if( rc!=SQLITE_OK ) goto next_exit;
}
pCur->rowid++;
next_exit:
/* TODO: Handle rc */
return rc;
}
/*
** Reset a schema table cursor.
*/
static int schemaFilter(
sqlite3_vtab_cursor *pVtabCursor,
int idxNum, const char *idxStr,
int argc, sqlite3_value **argv
){
int rc;
schema_vtab *pVtab = (schema_vtab *)(pVtabCursor->pVtab);
schema_cursor *pCur = (schema_cursor *)pVtabCursor;
pCur->rowid = 0;
finalize(&pCur->pTableList);
finalize(&pCur->pColumnList);
finalize(&pCur->pDbList);
rc = sqlite3_prepare(pVtab->db,"SELECT 0, 'main'", -1, &pCur->pDbList, 0);
return (rc==SQLITE_OK ? schemaNext(pVtabCursor) : rc);
}
/*
** Analyse the WHERE condition.
*/
static int schemaBestIndex(sqlite3_vtab *tab, sqlite3_index_info *pIdxInfo){
return SQLITE_OK;
}
/*
** A virtual table module that merely echos method calls into TCL
** variables.
*/
static sqlite3_module schemaModule = {
0, /* iVersion */
schemaCreate,
schemaCreate,
schemaBestIndex,
schemaDestroy,
schemaDestroy,
schemaOpen, /* xOpen - open a cursor */
schemaClose, /* xClose - close a cursor */
schemaFilter, /* xFilter - configure scan constraints */
schemaNext, /* xNext - advance a cursor */
schemaEof, /* xEof */
schemaColumn, /* xColumn - read data */
schemaRowid, /* xRowid - read data */
0, /* xUpdate */
0, /* xBegin */
0, /* xSync */
0, /* xCommit */
0, /* xRollback */
0, /* xFindMethod */
0, /* xRename */
};
/*
** Extension load function.
*/
static int installSchemaModule(sqlite3 *db, sqlite3 *sdb){
sqlite3_create_module(db, "schema", &schemaModule, (void *)sdb);
return 0;
}
/*
** sj(zValue, zJoin)
**
** The following block contains the implementation of an aggregate
** function that returns a string. Each time the function is stepped,
** it appends data to an internal buffer. When the aggregate is finalized,
** the contents of the buffer are returned.
**
** The first time the aggregate is stepped the buffer is set to a copy
** of the first argument. The second time and subsequent times it is
** stepped a copy of the second argument is appended to the buffer, then
** a copy of the first.
**
** Example:
**
** INSERT INTO t1(a) VALUES('1');
** INSERT INTO t1(a) VALUES('2');
** INSERT INTO t1(a) VALUES('3');
** SELECT sj(a, ', ') FROM t1;
**
** => "1, 2, 3"
**
*/
struct StrBuffer {
char *zBuf;
};
typedef struct StrBuffer StrBuffer;
static void joinFinalize(sqlite3_context *context){
StrBuffer *p;
p = (StrBuffer *)sqlite3_aggregate_context(context, sizeof(StrBuffer));
sqlite3_result_text(context, p->zBuf, -1, SQLITE_TRANSIENT);
sqlite3_free(p->zBuf);
}
static void joinStep(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
StrBuffer *p;
p = (StrBuffer *)sqlite3_aggregate_context(context, sizeof(StrBuffer));
if( p->zBuf==0 ){
p->zBuf = sqlite3_mprintf("%s", sqlite3_value_text(argv[0]));
}else{
char *zTmp = p->zBuf;
p->zBuf = sqlite3_mprintf("%s%s%s",
zTmp, sqlite3_value_text(argv[1]), sqlite3_value_text(argv[0])
);
sqlite3_free(zTmp);
}
}
/*
** dq(zString)
**
** This scalar function accepts a single argument and interprets it as
** a text value. The return value is the argument enclosed in double
** quotes. If any double quote characters are present in the argument,
** these are escaped.
**
** dq('the raven "Nevermore."') == '"the raven ""Nevermore."""'
*/
static void doublequote(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
int ii;
char *zOut;
char *zCsr;
const char *zIn = (const char *)sqlite3_value_text(argv[0]);
int nIn = sqlite3_value_bytes(argv[0]);
zOut = sqlite3_malloc(nIn*2+3);
zCsr = zOut;
*zCsr++ = '"';
for(ii=0; ii<nIn; ii++){
*zCsr++ = zIn[ii];
if( zIn[ii]=='"' ){
*zCsr++ = '"';
}
}
*zCsr++ = '"';
*zCsr++ = '\0';
sqlite3_result_text(context, zOut, -1, SQLITE_TRANSIENT);
sqlite3_free(zOut);
}
/*
** multireplace(zString, zSearch1, zReplace1, ...)
*/
static void multireplace(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
int i = 0;
char *zOut = 0;
int nOut = 0;
int nMalloc = 0;
const char *zIn = (const char *)sqlite3_value_text(argv[0]);
int nIn = sqlite3_value_bytes(argv[0]);
while( i<nIn ){
const char *zCopy = &zIn[i];
int nCopy = 1;
int nReplace = 1;
int j;
for(j=1; j<(argc-1); j+=2){
const char *z = (const char *)sqlite3_value_text(argv[j]);
int n = sqlite3_value_bytes(argv[j]);
if( n<=(nIn-i) && 0==strncmp(z, zCopy, n) ){
zCopy = (const char *)sqlite3_value_text(argv[j+1]);
nCopy = sqlite3_value_bytes(argv[j+1]);
nReplace = n;
break;
}
}
if( (nOut+nCopy)>nMalloc ){
nMalloc += (nMalloc + 16);
zOut = (char *)sqlite3_realloc(zOut, nMalloc);
}
memcpy(&zOut[nOut], zCopy, nCopy);
i += nReplace;
nOut += nCopy;
}
sqlite3_result_text(context, zOut, nOut, SQLITE_TRANSIENT);
sqlite3_free(zOut);
}
/*
** A callback for sqlite3_exec() invokes the callback specified by the
** GenfkeyCb structure pointed to by the void* passed as the first argument.
*/
static int invokeCallback(void *p, int nArg, char **azArg, char **azCol){
GenfkeyCb *pCb = (GenfkeyCb *)p;
return pCb->xData(pCb->pCtx, pCb->eType, azArg[0]);
}
int detectSchemaProblem(
sqlite3 *db, /* Database connection */
const char *zMessage, /* English language error message */
const char *zSql, /* SQL statement to run */
GenfkeyCb *pCb
){
sqlite3_stmt *pStmt;
int rc;
rc = sqlite3_prepare(db, zSql, -1, &pStmt, 0);
if( rc!=SQLITE_OK ){
return rc;
}
while( SQLITE_ROW==sqlite3_step(pStmt) ){
char *zDel;
int iFk = sqlite3_column_int(pStmt, 0);
const char *zTab = (const char *)sqlite3_column_text(pStmt, 1);
zDel = sqlite3_mprintf("Error in table %s: %s", zTab, zMessage);
rc = pCb->xData(pCb->pCtx, pCb->eType, zDel);
sqlite3_free(zDel);
if( rc!=SQLITE_OK ) return rc;
zDel = sqlite3_mprintf(
"DELETE FROM temp.fkey WHERE from_tbl = %Q AND fkid = %d"
, zTab, iFk
);
sqlite3_exec(db, zDel, 0, 0, 0);
sqlite3_free(zDel);
}
sqlite3_finalize(pStmt);
return SQLITE_OK;
}
/*
** Create and populate temporary table "fkey".
*/
static int populateTempTable(sqlite3 *db, GenfkeyCb *pCallback){
int rc;
rc = sqlite3_exec(db,
"CREATE VIRTUAL TABLE temp.v_fkey USING schema(foreign_key_list);"
"CREATE VIRTUAL TABLE temp.v_col USING schema(table_info);"
"CREATE VIRTUAL TABLE temp.v_idxlist USING schema(index_list);"
"CREATE VIRTUAL TABLE temp.v_idxinfo USING schema(index_info);"
"CREATE VIRTUAL TABLE temp.v_triggers USING schema(trigger_list);"
"CREATE TABLE temp.fkey AS "
"SELECT from_tbl, to_tbl, fkid, from_col, to_col, on_update, on_delete "
"FROM temp.v_fkey WHERE database = 'main';"
, 0, 0, 0
);
if( rc!=SQLITE_OK ) return rc;
rc = detectSchemaProblem(db, "foreign key columns do not exist",
"SELECT fkid, from_tbl "
"FROM temp.fkey "
"WHERE to_col IS NOT NULL AND NOT EXISTS (SELECT 1 "
"FROM temp.v_col WHERE tablename=to_tbl AND name==to_col"
")", pCallback
);
if( rc!=SQLITE_OK ) return rc;
/* At this point the temp.fkey table is mostly populated. If any foreign
** keys were specified so that they implicitly refer to they primary
** key of the parent table, the "to_col" values of the temp.fkey rows
** are still set to NULL.
**
** This is easily fixed for single column primary keys, but not for
** composites. With a composite primary key, there is no way to reliably
** query sqlite for the order in which the columns that make up the
** composite key were declared i.e. there is no way to tell if the
** schema actually contains "PRIMARY KEY(a, b)" or "PRIMARY KEY(b, a)".
** Therefore, this case is not handled. The following function call
** detects instances of this case.
*/
rc = detectSchemaProblem(db, "implicit mapping to composite primary key",
"SELECT fkid, from_tbl "
"FROM temp.fkey "
"WHERE to_col IS NULL "
"GROUP BY fkid, from_tbl HAVING count(*) > 1", pCallback
);
if( rc!=SQLITE_OK ) return rc;
/* Detect attempts to implicitly map to the primary key of a table
** that has no primary key column.
*/
rc = detectSchemaProblem(db, "implicit mapping to non-existant primary key",
"SELECT fkid, from_tbl "
"FROM temp.fkey "
"WHERE to_col IS NULL AND NOT EXISTS "
"(SELECT 1 FROM temp.v_col WHERE pk AND tablename = temp.fkey.to_tbl)"
, pCallback
);
if( rc!=SQLITE_OK ) return rc;
/* Fix all the implicit primary key mappings in the temp.fkey table. */
rc = sqlite3_exec(db,
"UPDATE temp.fkey SET to_col = "
"(SELECT name FROM temp.v_col WHERE pk AND tablename=temp.fkey.to_tbl)"
" WHERE to_col IS NULL;"
, 0, 0, 0
);
if( rc!=SQLITE_OK ) return rc;
/* Now check that all all parent keys are either primary keys or
** subject to a unique constraint.
*/
rc = sqlite3_exec(db,
"CREATE TABLE temp.idx2 AS SELECT "
"il.tablename AS tablename,"
"ii.indexname AS indexname,"
"ii.name AS col "
"FROM temp.v_idxlist AS il, temp.v_idxinfo AS ii "
"WHERE il.isunique AND il.database='main' AND ii.indexname = il.name;"
"INSERT INTO temp.idx2 "
"SELECT tablename, 'pk', name FROM temp.v_col WHERE pk;"
"CREATE TABLE temp.idx AS SELECT "
"tablename, indexname, sj(dq(col),',') AS cols "
"FROM (SELECT * FROM temp.idx2 ORDER BY col) "
"GROUP BY tablename, indexname;"
"CREATE TABLE temp.fkey2 AS SELECT "
"fkid, from_tbl, to_tbl, sj(dq(to_col),',') AS cols "
"FROM (SELECT * FROM temp.fkey ORDER BY to_col) "
"GROUP BY fkid, from_tbl;"
"CREATE TABLE temp.triggers AS SELECT "
"triggername FROM temp.v_triggers WHERE database='main' AND "
"triggername LIKE 'genfkey%';"
, 0, 0, 0
);
if( rc!=SQLITE_OK ) return rc;
rc = detectSchemaProblem(db, "foreign key is not unique",
"SELECT fkid, from_tbl "
"FROM temp.fkey2 "
"WHERE NOT EXISTS (SELECT 1 "
"FROM temp.idx WHERE tablename=to_tbl AND fkey2.cols==idx.cols"
")", pCallback
);
if( rc!=SQLITE_OK ) return rc;
return rc;
}
#define GENFKEY_ERROR 1
#define GENFKEY_DROPTRIGGER 2
#define GENFKEY_CREATETRIGGER 3
static int genfkey_create_triggers(
sqlite3 *sdb, /* Connection to read schema from */
const char *zDb, /* Name of db to read ("main", "temp") */
void *pCtx, /* Context pointer to pass to xData */
int (*xData)(void *, int, const char *)
){
const char *zSql =
"SELECT multireplace('"
"-- Triggers for foreign key mapping:\n"
"--\n"
"-- /from_readable/ REFERENCES /to_readable/\n"
"-- on delete /on_delete/\n"
"-- on update /on_update/\n"
"--\n"
/* The "BEFORE INSERT ON <referencing>" trigger. This trigger's job is to
** throw an exception if the user tries to insert a row into the
** referencing table for which there is no corresponding row in
** the referenced table.
*/
"CREATE TRIGGER /name/_insert_referencing BEFORE INSERT ON /tbl/ WHEN \n"
" /key_notnull/ AND NOT EXISTS (SELECT 1 FROM /ref/ WHERE /cond1/)\n"
"BEGIN\n"
" SELECT RAISE(ABORT, ''constraint failed'');\n"
"END;\n"
/* The "BEFORE UPDATE ON <referencing>" trigger. This trigger's job
** is to throw an exception if the user tries to update a row in the
** referencing table causing it to correspond to no row in the
** referenced table.
*/
"CREATE TRIGGER /name/_update_referencing BEFORE\n"
" UPDATE OF /rkey_list/ ON /tbl/ WHEN \n"
" /key_notnull/ AND \n"
" NOT EXISTS (SELECT 1 FROM /ref/ WHERE /cond1/)\n"
"BEGIN\n"
" SELECT RAISE(ABORT, ''constraint failed'');\n"
"END;\n"
/* The "BEFORE DELETE ON <referenced>" trigger. This trigger's job
** is to detect when a row is deleted from the referenced table to
** which rows in the referencing table correspond. The action taken
** depends on the value of the 'ON DELETE' clause.
*/
"CREATE TRIGGER /name/_delete_referenced BEFORE DELETE ON /ref/ WHEN\n"
" EXISTS (SELECT 1 FROM /tbl/ WHERE /cond2/)\n"
"BEGIN\n"
" /delete_action/\n"
"END;\n"
/* The "BEFORE DELETE ON <referenced>" trigger. This trigger's job
** is to detect when the key columns of a row in the referenced table
** to which one or more rows in the referencing table correspond are
** updated. The action taken depends on the value of the 'ON UPDATE'
** clause.
*/
"CREATE TRIGGER /name/_update_referenced AFTER\n"
" UPDATE OF /fkey_list/ ON /ref/ WHEN \n"
" EXISTS (SELECT 1 FROM /tbl/ WHERE /cond2/)\n"
"BEGIN\n"
" /update_action/\n"
"END;\n"
"'"
/* These are used in the SQL comment written above each set of triggers */
", '/from_readable/', from_tbl || '(' || sj(from_col, ', ') || ')'"
", '/to_readable/', to_tbl || '(' || sj(to_col, ', ') || ')'"
", '/on_delete/', on_delete"
", '/on_update/', on_update"
", '/name/', 'genfkey' || min(rowid)"
", '/tbl/', dq(from_tbl)"
", '/ref/', dq(to_tbl)"
", '/key_notnull/', sj('new.' || dq(from_col) || ' IS NOT NULL', ' AND ')"
", '/fkey_list/', sj(to_col, ', ')"
", '/rkey_list/', sj(from_col, ', ')"
", '/cond1/', sj(multireplace('new./from/ == /to/'"
", '/from/', dq(from_col)"
", '/to/', dq(to_col)"
"), ' AND ')"
", '/cond2/', sj(multireplace('old./to/ == /from/'"
", '/from/', dq(from_col)"
", '/to/', dq(to_col)"
"), ' AND ')"
", '/update_action/', CASE on_update "
"WHEN 'SET NULL' THEN "
"multireplace('UPDATE /tbl/ SET /setlist/ WHERE /where/;' "
", '/setlist/', sj(from_col||' = NULL',', ')"
", '/tbl/', dq(from_tbl)"
", '/where/', sj(from_col||' = old.'||dq(to_col),' AND ')"
")"
"WHEN 'CASCADE' THEN "
"multireplace('UPDATE /tbl/ SET /setlist/ WHERE /where/;' "
", '/setlist/', sj(dq(from_col)||' = new.'||dq(to_col),', ')"
", '/tbl/', dq(from_tbl)"
", '/where/', sj(dq(from_col)||' = old.'||dq(to_col),' AND ')"
")"
"ELSE "
" 'SELECT RAISE(ABORT, ''constraint failed'');'"
"END "
", '/delete_action/', CASE on_delete "
"WHEN 'SET NULL' THEN "
"multireplace('UPDATE /tbl/ SET /setlist/ WHERE /where/;' "
", '/setlist/', sj(from_col||' = NULL',', ')"
", '/tbl/', dq(from_tbl)"
", '/where/', sj(from_col||' = old.'||dq(to_col),' AND ')"
")"
"WHEN 'CASCADE' THEN "
"multireplace('DELETE FROM /tbl/ WHERE /where/;' "
", '/tbl/', dq(from_tbl)"
", '/where/', sj(dq(from_col)||' = old.'||dq(to_col),' AND ')"
")"
"ELSE "
" 'SELECT RAISE(ABORT, ''constraint failed'');'"
"END "
") FROM temp.fkey "
"GROUP BY from_tbl, fkid"
;
int rc;
const int enc = SQLITE_UTF8;
sqlite3 *db = 0;
GenfkeyCb cb;
cb.xData = xData;
cb.pCtx = pCtx;
/* Open the working database handle. */
rc = sqlite3_open(":memory:", &db);
if( rc!=SQLITE_OK ) goto genfkey_exit;
/* Create the special scalar and aggregate functions used by this program. */
sqlite3_create_function(db, "dq", 1, enc, 0, doublequote, 0, 0);
sqlite3_create_function(db, "multireplace", -1, enc, db, multireplace, 0, 0);
sqlite3_create_function(db, "sj", 2, enc, 0, 0, joinStep, joinFinalize);
/* Install the "schema" virtual table module */
installSchemaModule(db, sdb);
/* Create and populate a temp table with the information required to
** build the foreign key triggers. See function populateTempTable()
** for details.
*/
cb.eType = GENFKEY_ERROR;
rc = populateTempTable(db, &cb);
if( rc!=SQLITE_OK ) goto genfkey_exit;
/* Unless the --no-drop option was specified, generate DROP TRIGGER
** statements to drop any triggers in the database generated by a
** previous run of this program.
*/
cb.eType = GENFKEY_DROPTRIGGER;
rc = sqlite3_exec(db,
"SELECT 'DROP TRIGGER main.' || dq(triggername) || ';' FROM triggers"
,invokeCallback, (void *)&cb, 0
);
if( rc!=SQLITE_OK ) goto genfkey_exit;
/* Run the main query to create the trigger definitions. */
cb.eType = GENFKEY_CREATETRIGGER;
rc = sqlite3_exec(db, zSql, invokeCallback, (void *)&cb, 0);
if( rc!=SQLITE_OK ) goto genfkey_exit;
genfkey_exit:
sqlite3_close(db);
return rc;
}
#endif
/* End genfkey logic. */
/*************************************************************************/
/*************************************************************************/
/* Saved resource information for the beginning of an operation */ /* Saved resource information for the beginning of an operation */
static struct rusage sBegin; static struct rusage sBegin;
@@ -926,6 +1766,63 @@ static int run_schema_dump_query(
return rc; return rc;
} }
#if !defined(SQLITE_OMIT_VIRTUALTABLE) && !defined(SQLITE_OMIT_SUBQUERY)
struct GenfkeyCmd {
sqlite3 *db; /* Database handle */
struct callback_data *pCb; /* Callback data */
int isIgnoreErrors; /* True for --ignore-errors */
int isExec; /* True for --exec */
int isNoDrop; /* True for --no-drop */
int nErr; /* Number of errors seen so far */
};
typedef struct GenfkeyCmd GenfkeyCmd;
static int genfkeyParseArgs(GenfkeyCmd *p, char **azArg, int nArg){
int ii;
memset(p, 0, sizeof(GenfkeyCmd));
for(ii=0; ii<nArg; ii++){
int n = strlen(azArg[ii]);
if( n>2 && n<10 && 0==strncmp(azArg[ii], "--no-drop", n) ){
p->isNoDrop = 1;
}else if( n>2 && n<16 && 0==strncmp(azArg[ii], "--ignore-errors", n) ){
p->isIgnoreErrors = 1;
}else if( n>2 && n<7 && 0==strncmp(azArg[ii], "--exec", n) ){
p->isExec = 1;
}else{
fprintf(stderr, "unknown option: %s\n", azArg[ii]);
return -1;
}
}
return SQLITE_OK;
}
static int genfkeyCmdCb(void *pCtx, int eType, const char *z){
GenfkeyCmd *p = (GenfkeyCmd *)pCtx;
if( eType==GENFKEY_ERROR && !p->isIgnoreErrors ){
p->nErr++;
fprintf(stderr, "%s\n", z);
}
if( p->nErr==0 && (
(eType==GENFKEY_CREATETRIGGER)
|| (eType==GENFKEY_DROPTRIGGER && !p->isNoDrop)
)){
if( p->isExec ){
sqlite3_exec(p->db, z, 0, 0, 0);
}else{
char *zCol = "sql";
callback((void *)p->pCb, 1, (char **)&z, (char **)&zCol);
}
}
return SQLITE_OK;
}
#endif
/* /*
** Text of a help message ** Text of a help message
*/ */
@@ -937,6 +1834,13 @@ static char zHelp[] =
".echo ON|OFF Turn command echo on or off\n" ".echo ON|OFF Turn command echo on or off\n"
".exit Exit this program\n" ".exit Exit this program\n"
".explain ON|OFF Turn output mode suitable for EXPLAIN on or off.\n" ".explain ON|OFF Turn output mode suitable for EXPLAIN on or off.\n"
#if !defined(SQLITE_OMIT_VIRTUALTABLE) && !defined(SQLITE_OMIT_SUBQUERY)
".genfkey ?OPTIONS? Options are:\n"
" --no-drop: Do not drop old fkey triggers.\n"
" --ignore-errors: Ignore tables with fkey errors\n"
" --exec: Execute generated SQL immediately\n"
" --help: Print help message for .genfkey\n"
#endif
".header(s) ON|OFF Turn display of headers on or off\n" ".header(s) ON|OFF Turn display of headers on or off\n"
".help Show this message\n" ".help Show this message\n"
".import FILE TABLE Import data from FILE into TABLE\n" ".import FILE TABLE Import data from FILE into TABLE\n"
@@ -1240,6 +2144,17 @@ static int do_meta_command(char *zLine, struct callback_data *p){
} }
}else }else
#if !defined(SQLITE_OMIT_VIRTUALTABLE) && !defined(SQLITE_OMIT_SUBQUERY)
if( c=='g' && strncmp(azArg[0], "genfkey", n)==0 ){
GenfkeyCmd cmd;
if( 0==genfkeyParseArgs(&cmd, &azArg[1], nArg-1) ){
cmd.db = p->db;
cmd.pCb = p;
genfkey_create_triggers(p->db, "main", (void *)&cmd, genfkeyCmdCb);
}
}else
#endif
if( c=='h' && (strncmp(azArg[0], "header", n)==0 || if( c=='h' && (strncmp(azArg[0], "header", n)==0 ||
strncmp(azArg[0], "headers", n)==0 )&& nArg>1 ){ strncmp(azArg[0], "headers", n)==0 )&& nArg>1 ){
p->showHeader = booleanValue(azArg[1]); p->showHeader = booleanValue(azArg[1]);

8
tool/genfkey.test
View File

@@ -36,7 +36,7 @@ do_test genfkey-1.1 {
} }
} {} } {}
do_test genfkey-1.2 { do_test genfkey-1.2 {
execsql [exec ./genfkey test.db] execsql [exec ./sqlite3 test.db .genfkey]
} {} } {}
do_test genfkey-1.3 { do_test genfkey-1.3 {
catchsql { INSERT INTO t2 VALUES(1, 2) } catchsql { INSERT INTO t2 VALUES(1, 2) }
@@ -129,7 +129,7 @@ do_test genfkey-2.1 {
} }
} {} } {}
do_test genfkey-2.2 { do_test genfkey-2.2 {
execsql [exec ./genfkey test.db] execsql [exec ./sqlite3 test.db .genfkey]
} {} } {}
do_test genfkey-2.3 { do_test genfkey-2.3 {
execsql { execsql {
@@ -186,7 +186,7 @@ do_test genfkey-3.1 {
} }
} {} } {}
do_test genfkey-3.2 { do_test genfkey-3.2 {
execsql [exec ./genfkey test.db] execsql [exec ./sqlite3 test.db .genfkey]
} {} } {}
do_test genfkey-3.3 { do_test genfkey-3.3 {
execsql { execsql {
@@ -249,7 +249,7 @@ do_test genfkey-4.1 {
} {} } {}
do_test genfkey-4.X { do_test genfkey-4.X {
set rc [catch {exec ./genfkey test.db} msg] set rc [catch {exec ./sqlite3 test.db .genfkey} msg]
list $rc $msg list $rc $msg
} "1 {[string trim { } "1 {[string trim {
Error in table t5: foreign key columns do not exist Error in table t5: foreign key columns do not exist