使用了下Sqlite3

发布时间：2020-12-12 23:40:12 所属栏目：百科来源：网络整理

导读：使用了sqlite3，有些感受：基本的方法就是sqlite3_column_*、sqlite3_prepare_*、sqlite3_bind_*、sqlite3_step等sqlite3_exec都是上述的方法组合出来的，观察legecy.c的源代码可知。感觉sqlite3的语法结构怪怪的，exec方法居然使用了循环来实现，不知道是

使用了sqlite3，有些感受：基本的方法就是sqlite3_column_*、sqlite3_prepare_*、sqlite3_bind_*、sqlite3_step等sqlite3_exec都是上述的方法组合出来的，观察legecy.c的源代码可知。感觉sqlite3的语法结构怪怪的，exec方法居然使用了循环来实现，不知道是作者思考方法和我不同，还是自己C语言用的不熟练。老是存在指针的类型转换问题，看来指针学的不好，真对不同的情况在callback回调函数和基本的s qlite3_column_*中做出选择。 code in legecy.c version 3.3.10 /*
** 2001 September 15
**
** 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.
**
*************************************************************************
** Main file for the SQLite library. The routines in this file
** implement the programmer interface to the library. Routines in
** other files are for internal use by SQLite and should not be
** accessed by users of the library.
**
** $Id: legacy.c,v 1.16 2006/09/15 07:28:50 drh Exp $
*/ #include "sqliteInt.h"
#include "os.h"
#include <ctype.h> /*
** Execute SQL code. Return one of the SQLITE_ success/failure
** codes. Also write an error message into memory obtained from
** malloc() and make *pzErrMsg point to that message.
**
** If the SQL is a query,then for each row in the query result
** the xCallback() function is called. pArg becomes the first
** argument to xCallback(). If xCallback=NULL then no callback
** is invoked,even for queries.
*/
int sqlite3_exec(
sqlite3 *db,/* The database on which the SQL executes */
const char *zSql,/* The SQL to be executed */
sqlite3_callback xCallback,/* Invoke this callback routine */
void *pArg,/* First argument to xCallback() */
char **pzErrMsg /* Write error messages here */
){
int rc = SQLITE_OK;
const char *zLeftover;
sqlite3_stmt *pStmt = 0;
char **azCols = 0; int nRetry = 0;
int nChange = 0;
int nCallback; if( zSql==0 ) return SQLITE_OK;
while( (rc==SQLITE_OK || (rc==SQLITE_SCHEMA && (++nRetry)<2)) && zSql[0] ){
int nCol;
char **azVals = 0; pStmt = 0;
rc = sqlite3_prepare(db,zSql,-1,&pStmt,&zLeftover);
assert( rc==SQLITE_OK || pStmt==0 );
if( rc!=SQLITE_OK ){
continue;
}
if( !pStmt ){
/* this happens for a comment or white-space */
zSql = zLeftover;
continue;
} db->nChange += nChange;
nCallback = 0; nCol = sqlite3_column_count(pStmt);
azCols = sqliteMalloc(2*nCol*sizeof(const char *) + 1);
if( azCols==0 ){
goto exec_out;
} while( 1 ){
int i;
rc = sqlite3_step(pStmt); /* Invoke the callback function if required */
if( xCallback && (SQLITE_ROW==rc ||
(SQLITE_DONE==rc && !nCallback && db->flags&SQLITE_NullCallback)) ){
if( 0==nCallback ){
for(i=0; i<nCol; i++){
azCols[i] = (char *)sqlite3_column_name(pStmt,i);
}
nCallback++;
}
if( rc==SQLITE_ROW ){
azVals = &azCols[nCol];
for(i=0; i<nCol; i++){
azVals[i] = (char *)sqlite3_column_text(pStmt,i);
}
}
if( xCallback(pArg,nCol,azVals,azCols) ){
rc = SQLITE_ABORT;
goto exec_out;
}
} if( rc!=SQLITE_ROW ){
rc = sqlite3_finalize(pStmt);
pStmt = 0;
if( db->pVdbe==0 ){
nChange = db->nChange;
}
if( rc!=SQLITE_SCHEMA ){
nRetry = 0;
zSql = zLeftover;
while( isspace((unsigned char)zSql[0]) ) zSql++;
}
break;
}
} sqliteFree(azCols);
azCols = 0;
} exec_out:
if( pStmt ) sqlite3_finalize(pStmt);
if( azCols ) sqliteFree(azCols); rc = sqlite3ApiExit(0,rc);
if( rc!=SQLITE_OK && rc==sqlite3_errcode(db) && pzErrMsg ){
*pzErrMsg = sqlite3_malloc(1+strlen(sqlite3_errmsg(db)));
if( *pzErrMsg ){
strcpy(*pzErrMsg,sqlite3_errmsg(db));
}
}else if( pzErrMsg ){
*pzErrMsg = 0;
} assert( (rc&db->errMask)==rc ); return rc; }

（编辑：李大同）

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