Annotation of embedaddon/php/ext/sqlite/libsqlite/src/table.c, revision 1.1
1.1 ! misho 1: /*
! 2: ** 2001 September 15
! 3: **
! 4: ** The author disclaims copyright to this source code. In place of
! 5: ** a legal notice, here is a blessing:
! 6: **
! 7: ** May you do good and not evil.
! 8: ** May you find forgiveness for yourself and forgive others.
! 9: ** May you share freely, never taking more than you give.
! 10: **
! 11: *************************************************************************
! 12: ** This file contains the sqlite_get_table() and sqlite_free_table()
! 13: ** interface routines. These are just wrappers around the main
! 14: ** interface routine of sqlite_exec().
! 15: **
! 16: ** These routines are in a separate files so that they will not be linked
! 17: ** if they are not used.
! 18: */
! 19: #include <stdlib.h>
! 20: #include <string.h>
! 21: #include "sqliteInt.h"
! 22:
! 23: /*
! 24: ** This structure is used to pass data from sqlite_get_table() through
! 25: ** to the callback function is uses to build the result.
! 26: */
! 27: typedef struct TabResult {
! 28: char **azResult;
! 29: char *zErrMsg;
! 30: int nResult;
! 31: int nAlloc;
! 32: int nRow;
! 33: int nColumn;
! 34: long nData;
! 35: int rc;
! 36: } TabResult;
! 37:
! 38: /*
! 39: ** This routine is called once for each row in the result table. Its job
! 40: ** is to fill in the TabResult structure appropriately, allocating new
! 41: ** memory as necessary.
! 42: */
! 43: static int sqlite_get_table_cb(void *pArg, int nCol, char **argv, char **colv){
! 44: TabResult *p = (TabResult*)pArg;
! 45: int need;
! 46: int i;
! 47: char *z;
! 48:
! 49: /* Make sure there is enough space in p->azResult to hold everything
! 50: ** we need to remember from this invocation of the callback.
! 51: */
! 52: if( p->nRow==0 && argv!=0 ){
! 53: need = nCol*2;
! 54: }else{
! 55: need = nCol;
! 56: }
! 57: if( p->nData + need >= p->nAlloc ){
! 58: char **azNew;
! 59: p->nAlloc = p->nAlloc*2 + need + 1;
! 60: azNew = realloc( p->azResult, sizeof(char*)*p->nAlloc );
! 61: if( azNew==0 ){
! 62: p->rc = SQLITE_NOMEM;
! 63: return 1;
! 64: }
! 65: p->azResult = azNew;
! 66: }
! 67:
! 68: /* If this is the first row, then generate an extra row containing
! 69: ** the names of all columns.
! 70: */
! 71: if( p->nRow==0 ){
! 72: p->nColumn = nCol;
! 73: for(i=0; i<nCol; i++){
! 74: if( colv[i]==0 ){
! 75: z = 0;
! 76: }else{
! 77: z = malloc( strlen(colv[i])+1 );
! 78: if( z==0 ){
! 79: p->rc = SQLITE_NOMEM;
! 80: return 1;
! 81: }
! 82: strcpy(z, colv[i]);
! 83: }
! 84: p->azResult[p->nData++] = z;
! 85: }
! 86: }else if( p->nColumn!=nCol ){
! 87: sqliteSetString(&p->zErrMsg,
! 88: "sqlite_get_table() called with two or more incompatible queries",
! 89: (char*)0);
! 90: p->rc = SQLITE_ERROR;
! 91: return 1;
! 92: }
! 93:
! 94: /* Copy over the row data
! 95: */
! 96: if( argv!=0 ){
! 97: for(i=0; i<nCol; i++){
! 98: if( argv[i]==0 ){
! 99: z = 0;
! 100: }else{
! 101: z = malloc( strlen(argv[i])+1 );
! 102: if( z==0 ){
! 103: p->rc = SQLITE_NOMEM;
! 104: return 1;
! 105: }
! 106: strcpy(z, argv[i]);
! 107: }
! 108: p->azResult[p->nData++] = z;
! 109: }
! 110: p->nRow++;
! 111: }
! 112: return 0;
! 113: }
! 114:
! 115: /*
! 116: ** Query the database. But instead of invoking a callback for each row,
! 117: ** malloc() for space to hold the result and return the entire results
! 118: ** at the conclusion of the call.
! 119: **
! 120: ** The result that is written to ***pazResult is held in memory obtained
! 121: ** from malloc(). But the caller cannot free this memory directly.
! 122: ** Instead, the entire table should be passed to sqlite_free_table() when
! 123: ** the calling procedure is finished using it.
! 124: */
! 125: int sqlite_get_table(
! 126: sqlite *db, /* The database on which the SQL executes */
! 127: const char *zSql, /* The SQL to be executed */
! 128: char ***pazResult, /* Write the result table here */
! 129: int *pnRow, /* Write the number of rows in the result here */
! 130: int *pnColumn, /* Write the number of columns of result here */
! 131: char **pzErrMsg /* Write error messages here */
! 132: ){
! 133: int rc;
! 134: TabResult res;
! 135: if( pazResult==0 ){ return SQLITE_ERROR; }
! 136: *pazResult = 0;
! 137: if( pnColumn ) *pnColumn = 0;
! 138: if( pnRow ) *pnRow = 0;
! 139: res.zErrMsg = 0;
! 140: res.nResult = 0;
! 141: res.nRow = 0;
! 142: res.nColumn = 0;
! 143: res.nData = 1;
! 144: res.nAlloc = 20;
! 145: res.rc = SQLITE_OK;
! 146: res.azResult = malloc( sizeof(char*)*res.nAlloc );
! 147: if( res.azResult==0 ){
! 148: return SQLITE_NOMEM;
! 149: }
! 150: res.azResult[0] = 0;
! 151: rc = sqlite_exec(db, zSql, sqlite_get_table_cb, &res, pzErrMsg);
! 152: if( res.azResult ){
! 153: res.azResult[0] = (char*)res.nData;
! 154: }
! 155: if( rc==SQLITE_ABORT ){
! 156: sqlite_free_table(&res.azResult[1]);
! 157: if( res.zErrMsg ){
! 158: if( pzErrMsg ){
! 159: free(*pzErrMsg);
! 160: *pzErrMsg = res.zErrMsg;
! 161: sqliteStrRealloc(pzErrMsg);
! 162: }else{
! 163: sqliteFree(res.zErrMsg);
! 164: }
! 165: }
! 166: return res.rc;
! 167: }
! 168: sqliteFree(res.zErrMsg);
! 169: if( rc!=SQLITE_OK ){
! 170: sqlite_free_table(&res.azResult[1]);
! 171: return rc;
! 172: }
! 173: if( res.nAlloc>res.nData ){
! 174: char **azNew;
! 175: azNew = realloc( res.azResult, sizeof(char*)*(res.nData+1) );
! 176: if( azNew==0 ){
! 177: sqlite_free_table(&res.azResult[1]);
! 178: return SQLITE_NOMEM;
! 179: }
! 180: res.nAlloc = res.nData+1;
! 181: res.azResult = azNew;
! 182: }
! 183: *pazResult = &res.azResult[1];
! 184: if( pnColumn ) *pnColumn = res.nColumn;
! 185: if( pnRow ) *pnRow = res.nRow;
! 186: return rc;
! 187: }
! 188:
! 189: /*
! 190: ** This routine frees the space the sqlite_get_table() malloced.
! 191: */
! 192: void sqlite_free_table(
! 193: char **azResult /* Result returned from from sqlite_get_table() */
! 194: ){
! 195: if( azResult ){
! 196: int i, n;
! 197: azResult--;
! 198: if( azResult==0 ) return;
! 199: n = (int)(long)azResult[0];
! 200: for(i=1; i<n; i++){ if( azResult[i] ) free(azResult[i]); }
! 201: free(azResult);
! 202: }
! 203: }
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