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SQLite3 数据库基本操作

2010-06-24 10:33 603 查看

SQLite3 Database manipulate



Table of Contents

1.
Database basics –

SQL

2.
The core C API –

basics

1.
Database basics

<1> Creating a
database that we will call gps.db:

# sqlite3 gps.db

SQLite version 3.6.23.1

Enter ".help"
for instructions

Enter SQL statements
terminated with a ";"

sqlite> .exit

<2> Now you have a
database file on disk called gps.db

# ls

gps.db
test

<3> Create a
table. Issue the following statement from the shell:

sqlite> create table
pos(pos_x varchar(10), pos_y varchar(10));

<4> Add a few rows
to the table:

sqlite> insert into
pos values('234.2', '678.8');

sqlite> insert into
pos values('824.5', '926.7');

sqlite> insert into
pos values('176.5', '278.0');

<5> Now fetch them
back:

sqlite> .headers on

sqlite> select *
from pos;

pos_x|pos_y

234.2|678.8

824.5|926.7

176.5|278.0

<5> Getting table
information:

sqlite> .tables

pos

sqlite> .schema

CREATE TABLE pos(pos_x
varchar(10), pos_y varchar(10));

sqlite> .indices

<6> Exporting
Data:

sqlite> .output
gps.sql

<7> View configure
information:

sqlite> .show

echo: off

explain: off

headers: on

mode: list

nullvalue: ""

output: stdout

separator:
"|"

width:

2. The core C
API

<1>some basics API

Opening A New Database Connection

int sqlite3_open(

const char *filename,
/* Database filename (UTF-8) */

sqlite3 **ppDb
/* OUT: SQLite db handle */

);

int sqlite3_open16(

const void *filename,
/* Database filename (UTF-16) */

sqlite3 **ppDb
/* OUT: SQLite db handle */

);

int sqlite3_open_v2(

const char *filename,
/* Database filename (UTF-8) */

sqlite3 **ppDb,
/* OUT: SQLite db handle */

int flags,
/* Flags */

const char *zVfs
/* Name of VFS module to use */

);

Compiling
An SQL Statement

int sqlite3_prepare(

sqlite3 *db,
/* Database handle */

const char *zSql,
/* SQL statement, UTF-8 encoded */

int nByte,
/* Maximum length of zSql in
bytes. */

sqlite3_stmt **ppStmt,
/* OUT: Statement handle */

const char **pzTail
/* OUT: Pointer to unused portion of zSql
*/

);

int sqlite3_prepare_v2(

sqlite3 *db,
/* Database handle */

const char *zSql,
/* SQL statement, UTF-8 encoded */

int nByte,
/* Maximum length of zSql in
bytes. */

sqlite3_stmt **ppStmt,
/* OUT: Statement handle */

const char **pzTail
/* OUT: Pointer to unused portion of zSql
*/

);

int sqlite3_prepare16(

sqlite3 *db,
/* Database handle */

const void *zSql,
/* SQL statement, UTF-16 encoded */

int nByte,
/* Maximum length of zSql in
bytes. */

sqlite3_stmt **ppStmt,
/* OUT: Statement handle */

const void **pzTail
/* OUT: Pointer to unused portion of zSql
*/

);

int sqlite3_prepare16_v2(

sqlite3 *db,
/* Database handle */

const void *zSql,

/*
SQL statement, UTF-16 encoded */

int nByte,
/* Maximum length of zSql in
bytes. */

sqlite3_stmt **ppStmt,
/* OUT: Statement handle */

const void **pzTail
/* OUT: Pointer to unused portion of zSql
*/

);

Destroy A
Prepared Statement Object

int sqlite3_finalize(sqlite3_stmt
*pStmt);

Closing A
Database Connection

int sqlite3_close(sqlite3 *);

Convenience
Routines For Running Queries

int sqlite3_get_table(

sqlite3 *db,
/* An open database */

const char *zSql,
/* SQL to be evaluated */

char ***pazResult,
/* Results of the query */

int *pnRow,
/* Number of result rows written
here */

int *pnColumn,
/* Number of result columns written
here */

char **pzErrmsg
/* Error msg written here */

);

void sqlite3_free_table(char **result);

One-Step
Query Execution Interface

int sqlite3_exec(

sqlite3*,
/* An open
database */

const char *sql,
/* SQL to be
evaluated */

int (*callback)(void*,int,char**,char**),
/* Callback function */

void *,
/* 1st
argument to callback */

char **errmsg
/* Error msg
written here */

);

<2>program

Compile
arm format file:

arm-linux-gcc
-I/home/furtherchan/work/sqlite_porting/sqlite_build/include
-L/home/furtherchan/work/sqlite_porting/sqlite_build/lib -o c_api_sqlite
c_api_sqlite.c -lsqlite3

furtherchan@further:~/work/sqlite_porting$
ll c_api_sqlite

-rwxr-xr-x 1 furtherchan furtherchan 9488 2010-06-23 15:25 c_api_sqlite

furtherchan@further:~/work/sqlite_porting$
arm-linux-strip c_api_sqlite

furtherchan@further:~/work/sqlite_porting$
ll c_api_sqlite

-rwxr-xr-x 1 furtherchan furtherchan 4040 2010-06-23 15:26 c_api_sqlite

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章节导航

SQLite3 数据库基本操作

Opening A New Database Connection

CompilingAn SQL Statement

Destroy APrepared Statement Object

Closing ADatabase Connection

ConvenienceRoutines For Running Queries