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Overview
Comment:Add support for joins.
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1: 8c6e6a4ed7b6aa3582c7e38c1ced9ee286b905f3
User & Date: drh 2011-07-16 20:00:10
Context
2011-07-18
09:39
Fix handling of "AS" in FROM clauses. check-in: e7c27a9690 user: dan tags: trunk
2011-07-16
20:00
Add support for joins. check-in: 8c6e6a4ed7 user: drh tags: trunk
19:42
Fix compiler warnings. Remove an unused declaration. check-in: dba083d964 user: drh tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to src/datasrc.c. 

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** Return XJD1_DONE if the data source is empty and XJD1_ROW if
** the step results in a row of content being available.
*/
int xjd1DataSrcStep(DataSrc *p){
  int rc= XJD1_DONE;
  if( p==0 ) return XJD1_DONE;
  switch( p->eDSType ){












    case TK_ID: {
      rc = sqlite3_step(p->u.tab.pStmt);
      xjd1JsonFree(p->pValue);
      p->pValue = 0;
      if( rc==SQLITE_ROW ){
        const char *zJson = (const char*)sqlite3_column_text(p->u.tab.pStmt, 0);
        p->pValue = xjd1JsonParse(zJson, -1);
................................................................................
    return xjd1JsonRef(p->pValue);
  }
  switch( p->eDSType ){
    case TK_COMMA: {
      pRes = xjd1DataSrcDoc(p->u.join.pLeft, zDocName);
      if( pRes==0 ) pRes = xjd1DataSrcDoc(p->u.join.pRight, zDocName);
      break;




    }
    case TK_ID: {
      if( zDocName==0 || strcmp(p->u.tab.zName, zDocName)==0 ){
        pRes = xjd1JsonRef(p->pValue);
      }
      break;
    }
................................................................................
** Return XJD1_DONE if the data source is empty and XJD1_ROW if
** the rewind results in a row of content being available.
*/
int xjd1DataSrcRewind(DataSrc *p){
  if( p==0 ) return XJD1_DONE;
  xjd1JsonFree(p->pValue);  p->pValue = 0;
  switch( p->eDSType ){









    case TK_ID: {
      sqlite3_reset(p->u.tab.pStmt);
      return xjd1DataSrcStep(p);
    }
    case TK_NULL: {
      p->u.null.isDone = 0;
      return xjd1DataSrcStep(p);
    }
  }
  return XJD1_DONE;
}

/*
** Return true if the data source is at the end of file
*/
int xjd1DataSrcEOF(DataSrc *p){
  return 1;
}

/*
** The destructor for a Query object.
*/
int xjd1DataSrcClose(DataSrc *p){
  if( p==0 ) return XJD1_OK;
  xjd1JsonFree(p->pValue);  p->pValue = 0;
  switch( p->eDSType ){








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** Return XJD1_DONE if the data source is empty and XJD1_ROW if
** the step results in a row of content being available.
*/
int xjd1DataSrcStep(DataSrc *p){
  int rc= XJD1_DONE;
  if( p==0 ) return XJD1_DONE;
  switch( p->eDSType ){
    case TK_COMMA: {
      rc = xjd1DataSrcStep(p->u.join.pRight);
      if( rc==XJD1_DONE ){
        xjd1DataSrcRewind(p->u.join.pRight);
        rc = xjd1DataSrcStep(p->u.join.pLeft);
      }
      break;
    }
    case TK_SELECT: {
      rc = xjd1QueryStep(p->u.subq.q);
      break;
    }
    case TK_ID: {
      rc = sqlite3_step(p->u.tab.pStmt);
      xjd1JsonFree(p->pValue);
      p->pValue = 0;
      if( rc==SQLITE_ROW ){
        const char *zJson = (const char*)sqlite3_column_text(p->u.tab.pStmt, 0);
        p->pValue = xjd1JsonParse(zJson, -1);
................................................................................
    return xjd1JsonRef(p->pValue);
  }
  switch( p->eDSType ){
    case TK_COMMA: {
      pRes = xjd1DataSrcDoc(p->u.join.pLeft, zDocName);
      if( pRes==0 ) pRes = xjd1DataSrcDoc(p->u.join.pRight, zDocName);
      break;
    }
    case TK_SELECT: {
      pRes = xjd1QueryDoc(p->u.subq.q, zDocName);
      break;
    }
    case TK_ID: {
      if( zDocName==0 || strcmp(p->u.tab.zName, zDocName)==0 ){
        pRes = xjd1JsonRef(p->pValue);
      }
      break;
    }
................................................................................
** Return XJD1_DONE if the data source is empty and XJD1_ROW if
** the rewind results in a row of content being available.
*/
int xjd1DataSrcRewind(DataSrc *p){
  if( p==0 ) return XJD1_DONE;
  xjd1JsonFree(p->pValue);  p->pValue = 0;
  switch( p->eDSType ){
    case TK_COMMA: {
      xjd1DataSrcRewind(p->u.join.pLeft);
      xjd1DataSrcRewind(p->u.join.pRight);
      break;
    }
    case TK_SELECT: {
      xjd1QueryRewind(p->u.subq.q);
      break;
    }
    case TK_ID: {
      sqlite3_reset(p->u.tab.pStmt);
      return xjd1DataSrcStep(p);
    }
    case TK_NULL: {
      p->u.null.isDone = 0;
      return xjd1DataSrcStep(p);
    }
  }
  return XJD1_DONE;
}








/*
** The destructor for a Query object.
*/
int xjd1DataSrcClose(DataSrc *p){
  if( p==0 ) return XJD1_OK;
  xjd1JsonFree(p->pValue);  p->pValue = 0;
  switch( p->eDSType ){

Changes to src/query.c. 

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*/
int xjd1QueryRewind(Query *p){
  if( p==0 ) return XJD1_OK;
  if( p->eQType==TK_SELECT ){
    xjd1DataSrcRewind(p->u.simple.pFrom);
  }else{
    xjd1QueryRewind(p->u.compound.pLeft);
    p->u.compound.doneLeft = xjd1QueryEOF(p->u.compound.pLeft);
    xjd1QueryRewind(p->u.compound.pRight);
  }
  return XJD1_OK;
}

/*
** Advance a query to the next row.  Return XDJ1_DONE if there is no
................................................................................
      pOut = xjd1QueryDoc(p->pOuter, zDocName);
    }
  }
  return pOut;
}


/* Return true if there are no more rows available on this query */
int xjd1QueryEOF(Query *p){
  int rc;
  if( p->eQType==TK_SELECT ){
    rc = xjd1DataSrcEOF(p->u.simple.pFrom);
  }else{
    rc = 0;
    if( !p->u.compound.doneLeft ){
      rc = xjd1QueryEOF(p->u.compound.pLeft);
      if( rc ) p->u.compound.doneLeft = 1;
    }
    if( p->u.compound.doneLeft ){
      rc = xjd1QueryEOF(p->u.compound.pRight);
    }
  }
  return rc;
}

/*
** The destructor for a Query object.
*/
int xjd1QueryClose(Query *pQuery){
  int rc = XJD1_OK;
  if( pQuery==0 ) return rc;
  if( pQuery->eQType==TK_SELECT ){








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*/
int xjd1QueryRewind(Query *p){
  if( p==0 ) return XJD1_OK;
  if( p->eQType==TK_SELECT ){
    xjd1DataSrcRewind(p->u.simple.pFrom);
  }else{
    xjd1QueryRewind(p->u.compound.pLeft);
    p->u.compound.doneLeft = 0;
    xjd1QueryRewind(p->u.compound.pRight);
  }
  return XJD1_OK;
}

/*
** Advance a query to the next row.  Return XDJ1_DONE if there is no
................................................................................
      pOut = xjd1QueryDoc(p->pOuter, zDocName);
    }
  }
  return pOut;
}




















/*
** The destructor for a Query object.
*/
int xjd1QueryClose(Query *pQuery){
  int rc = XJD1_OK;
  if( pQuery==0 ) return rc;
  if( pQuery->eQType==TK_SELECT ){

Changes to src/xjd1Int.h. 

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/* Marker for routines not intended for external use */
#define PRIVATE

/* Additional tokens above and beyond those generated by the parser and
** found in parse.h 
*/
#define TK_NOT_LIKEOP        (TK_LIKEOP+128)
#define TK_NOT_IS            (TK_IS+128)
#define TK_FUNCTION          100
#define TK_SPACE             101
#define TK_ILLEGAL           102
#define TK_CREATECOLLECTION  103
#define TK_DROPCOLLECTION    104
#define TK_ARRAY             105
#define TK_STRUCT            106
................................................................................
void xjd1Unref(xjd1*);
void xjd1Error(xjd1*,int,const char*,...);

/******************************** datasrc.c **********************************/
int xjd1DataSrcInit(DataSrc*,Query*);
int xjd1DataSrcRewind(DataSrc*);
int xjd1DataSrcStep(DataSrc*);
int xjd1DataSrcEOF(DataSrc*);
int xjd1DataSrcClose(DataSrc*);
JsonNode *xjd1DataSrcDoc(DataSrc*, const char*);

/******************************** delete.c ***********************************/
int xjd1DeleteStep(xjd1_stmt*);

/******************************** expr.c *************************************/
................................................................................
/******************************** pragma.c ***********************************/
int xjd1PragmaStep(xjd1_stmt*);

/******************************** query.c ************************************/
int xjd1QueryInit(Query*,xjd1_stmt*,Query*);
int xjd1QueryRewind(Query*);
int xjd1QueryStep(Query*);
int xjd1QueryEOF(Query*);
int xjd1QueryClose(Query*);
JsonNode *xjd1QueryDoc(Query*, const char*);

/******************************** stmt.c *************************************/
JsonNode *xjd1StmtDoc(xjd1_stmt*, const char*);

/******************************** string.c ***********************************/








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/* Marker for routines not intended for external use */
#define PRIVATE

/* Additional tokens above and beyond those generated by the parser and
** found in parse.h 
*/
#define TK_NOT_LIKEOP        (TK_LIKEOP+128)

#define TK_FUNCTION          100
#define TK_SPACE             101
#define TK_ILLEGAL           102
#define TK_CREATECOLLECTION  103
#define TK_DROPCOLLECTION    104
#define TK_ARRAY             105
#define TK_STRUCT            106
................................................................................
void xjd1Unref(xjd1*);
void xjd1Error(xjd1*,int,const char*,...);

/******************************** datasrc.c **********************************/
int xjd1DataSrcInit(DataSrc*,Query*);
int xjd1DataSrcRewind(DataSrc*);
int xjd1DataSrcStep(DataSrc*);

int xjd1DataSrcClose(DataSrc*);
JsonNode *xjd1DataSrcDoc(DataSrc*, const char*);

/******************************** delete.c ***********************************/
int xjd1DeleteStep(xjd1_stmt*);

/******************************** expr.c *************************************/
................................................................................
/******************************** pragma.c ***********************************/
int xjd1PragmaStep(xjd1_stmt*);

/******************************** query.c ************************************/
int xjd1QueryInit(Query*,xjd1_stmt*,Query*);
int xjd1QueryRewind(Query*);
int xjd1QueryStep(Query*);

int xjd1QueryClose(Query*);
JsonNode *xjd1QueryDoc(Query*, const char*);

/******************************** stmt.c *************************************/
JsonNode *xjd1StmtDoc(xjd1_stmt*, const char*);

/******************************** string.c ***********************************/

Changes to test/base01.test. 

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SELECT FROM abc;
.result {"name":"abc"}

.testcase 120
SELECT FROM def;
.result {"name":"def"}





.testcase 130
SELECT { p:1, q:2 } FROM abc;
.result {"p":1,"q":2}
.testcase 131
SELECT {p:1, q:2+3} FROM abc;
.result {"p":1,"q":5}
.testcase 132








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SELECT FROM abc;
.result {"name":"abc"}

.testcase 120
SELECT FROM def;
.result {"name":"def"}

.testcase 125
SELECT FROM abc UNION ALL SELECT FROM def;
.result {"name":"abc"} {"name":"def"}

.testcase 130
SELECT { p:1, q:2 } FROM abc;
.result {"p":1,"q":2}
.testcase 131
SELECT {p:1, q:2+3} FROM abc;
.result {"p":1,"q":5}
.testcase 132

Added test/base04.test. 



































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-- Basic sanity checking.
--
.new t1.db
.testcase 100
CREATE COLLECTION c1;
INSERT INTO c1 VALUE {a:1, b:"one"};
INSERT INTO c1 VALUE {a:2, b:"two"};
CREATE COLLECTION c2;
INSERT INTO c2 VALUE {a:1, c:"once"};
INSERT INTO c2 VALUE {a:2, c:"twice"};
INSERT INTO c2 VALUE {a:3, c:"thrice"};

SELECT {a:c1.a, b:c1.b, c:c2.c} 
  FROM c1, c2
 WHERE c1.a==c2.a;
.result {"a":1,"b":"one","c":"once"} {"a":2,"b":"two","c":"twice"}

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