Sqlite参考手册

C界面 | C Interface

Read Data From A BLOB Incrementally

int sqlite3_blob_read(sqlite3_blob *, void *Z, int N, int iOffset);

该函数用于将数据从打开的BLOB句柄读取到调用者提供的缓冲区中。将N字节的数据从开放的BLOB复制到缓冲区Z中，从偏移iOffset开始。

如果偏移量iOffset小于BLOB末尾的N个字节，则返回SQLITE_ERROR并且不读取任何数据。如果N或iOffset小于零，则返回SQLITE_ERROR并且不读取任何数据。blob的大小（以及因此N + iOffset的最大值）可以使用sqlite3_blob_bytes()接口确定。

尝试从过期的BLOB句柄读取失败，错误代码为SQLITE_ABORT。

成功时，sqlite3_blob_read()返回SQLITE_OK。否则，将返回错误代码或扩展错误代码。

此例程仅适用于通过先前成功调用sqlite3_blob_open()创建且尚未由sqlite3_blob_close()关闭的BLOB句柄。将任何其他指针传递给此例程会导致未定义且可能不合意的行为。

C界面 | C Interface相关

1.64-Bit Integer Types
2.A Handle To An Open BLOB
3.An Introduction To The SQLite C/C++ Interface
4.Application Defined Page Cache
5.Attempt To Free Heap Memory
6.Authorizer Action Codes
7.Authorizer Return Codes
8.Automatically Load Statically Linked Extensions
9.Binding Values To Prepared Statements
10.C/C++ Interface For SQLite Version 3
11.C/C++ Interface For SQLite Version 3 (old)
12.Cancel Automatic Extension Loading
13.Checkpoint a database
14.Checkpoint Mode Values
15.Close A BLOB Handle
16.Closing A Database Connection
17.Collation Needed Callbacks
18.Column Names In A Result Set
19.Commit And Rollback Notification Callbacks
20.Compare the ages of two snapshot handles
21.Compile-Time Authorization Callbacks
22.Compile-Time Library Version Numbers
23.Compiling An SQL Statement
24.Configuration Options
25.Configure an auto-checkpoint
26.Configure database connections
27.Configuring The SQLite Library
28.Conflict resolution modes
29.Constants Defining Special Destructor Behavior
30.Convenience Routines For Running Queries
31.Copy And Free SQL Values
32.Count The Number Of Rows Modified
33.Create Or Redefine SQL Functions
34.Custom Page Cache Object
35.Data Change Notification Callbacks
36.Database Connection Configuration Options
37.Database Connection For Functions
38.Database Connection Handle
39.Database Connection Status
40.Database Snapshot
41.Declare The Schema Of A Virtual Table
42.Declared Datatype Of A Query Result
43.Define New Collating Sequences
44.Deprecated Functions
45.Deprecated Soft Heap Limit Interface
46.Destroy A Prepared Statement Object
47.Destroy a snapshot
48.Determine if a database is read-only
49.Determine If A Prepared Statement Has Been Reset
50.Determine If An SQL Statement Is Complete
51.Determine If An SQL Statement Writes The Database
52.Determine The Virtual Table Conflict Policy
53.Device Characteristics
54.Dynamically Typed Value Object
55.Enable Or Disable Extended Result Codes
56.Enable Or Disable Extension Loading
57.Enable Or Disable Shared Pager Cache
58.Error Codes And Messages
59.Error Logging Interface
60.Evaluate An SQL Statement
61.Experimental Interfaces
62.Extended Result Codes
63.Extract Metadata About A Column Of A Table
64.File Locking Levels
65.Find The Database Handle Of A Prepared Statement
66.Find the next prepared statement
67.Finding The Subtype Of SQL Values
68.Flags For File Open Operations
69.Flags for the xAccess VFS method
70.Flags for the xShmLock VFS method
71.Flush caches to disk mid-transaction
72.Formatted String Printing Functions
73.Free Memory Used By A Database Connection
74.Function Auxiliary Data
75.Function Flags
76.Fundamental Datatypes
77.Impose A Limit On Heap Size
78.Index Of A Parameter With A Given Name
79.Initialize The SQLite Library
80.Interrupt A Long-Running Query
81.Introduction
82.Last Insert Rowid
83.List Of SQLite Constants
84.List Of SQLite Functions
85.List Of SQLite Objects
86.Load An Extension
87.Loadable Extension Thunk
88.Low-Level Control Of Database Files
89.Low-level system error code
90.Maximum xShmLock index
91.Memory Allocation Routines
92.Memory Allocation Subsystem
93.Memory Allocator Statistics
94.Move a BLOB Handle to a New Row
95.Mutex Handle
96.Mutex Methods Object
97.Mutex Types
98.Mutex Verification Routines
99.Mutexes
100.Name Of A Host Parameter

Sqlite

SQLite，是一款轻型的数据库，是遵守ACID的关系型数据库管理系统，它包含在一个相对小的C库中。它是D.RichardHipp建立的公有领域项目。它的设计目标是嵌入式的，而且目前已经在很多嵌入式产品中使用了它，它占用资源非常的低，在嵌入式设备中，可能只需要几百K的内存就够了。它能够支持Windows/Linux/Unix等等主流的操作系统，同时能够跟很多程序语言相结合，比如 Tcl、C#、PHP、Java等，还有ODBC接口，同样比起Mysql、PostgreSQL这两款开源的世界著名数据库管理系统来

主页	https://sqlite.org/
源码	https://www.sqlite.org/src/
发布版本	3.21.0

Sqlite目录

1.C界面 \| C Interface
2.C Interface: Session Module
3.CLI
4.数据库文件表 \| Database File Format
5.数据类 \| Datatypes
6.动态内存分配 \| Dynamic Memory Allocation
7.外键约束 \| Foreign Key Constraints
8.全文索引 \| Full-Text Search
9.损坏方式 \| How To Corrupt
10.JSON
11.语言 \| Language
12.局限性 \| Limits
13.锁定和并发 \| Locking and Concurrency
14.其他 \| Miscellaneous
15.PRAGMA Statements
16.查询计划程序 \| Query Planner
17.R*Tree Module
18.RBU Extension
19.语法图 \| Syntax Diagrams
20.Tcl Interface
21.虚拟表机制 \| Virtual Table Mechanism
22.预写日志 \| Write-Ahead Logging
23.SQL 教程
24.SQL 简介
25.SQL 语法
26.SQL DELETE 语句
27.SQL UPDATE 语句
28.SQL NOT NULL 约束
29.SQL 约束
30.SQL CREATE TABLE 语句
31.SQL CREATE DATABASE 语句
32.SQL INSERT INTO SELECT 语句
33.SQL SELECT INTO 语句
34.SQL CREATE VIEW、REPLACE VIEW、 DROP VIEW 语句
35.SQL AUTO INCREMENT 字段
36.SQL ALTER TABLE 语句
37.SQL 撤销索引、表以及数据库
38.SQL CREATE INDEX 语句
39.SQL DEFAULT 约束
40.SQL CHECK 约束
41.SQL FOREIGN KEY 约束
42.SQL PRIMARY KEY 约束
43.SQL UNIQUE 约束
44.SQL 通用数据类型
45.SQL ISNULL()、NVL()、IFNULL() 和 COALESCE() 函数
46.SQL NULL 值 – IS NULL 和 IS NOT NULL
47.SQL Server 和 MySQL 中的 Date 函数
48.SQL MS Access、MySQL 和 SQL Server 数据类型
49.SQL 函数
50.SQL 总结
51.SQL 主机
52.SQL 快速参考
53.SQL ROUND() 函数
54.SQL Server GETDATE() 函数
55.MySQL DATE_FORMAT() 函数
56.MySQL DATEDIFF() 函数
57.MySQL DATE_SUB() 函数
58.MySQL DATE_ADD() 函数
59.MySQL EXTRACT() 函数
60.MySQL DATE() 函数
61.MySQL CURTIME() 函数
62.MySQL CURDATE() 函数
63.MySQL NOW() 函数
64.SQL Server CONVERT() 函数
65.SQL Server DATEDIFF() 函数
66.SQL Server DATEADD() 函数
67.SQL Server DATEPART() 函数
68.SQLite 命令
69.SQLite 安装
70.SQLite 简介
71.SQLite 运算符
72.SQLite Select 语句
73.SQLite 删除表
74.SQLite 创建表
75.SQLite Insert 语句
76.SQLite 分离数据库
77.SQLite 附加数据库
78.SQLite 创建数据库
79.SQLite 数据类型
80.SQLite 语法
81.SQLite Order By
82.SQLite Limit 子句
83.SQLite Glob 子句
84.SQLite Like 子句
85.SQLite Delete 语句
86.SQLite Update 语句
87.SQLite AND/OR 运算符
88.SQLite Where 子句
89.SQLite 表达式
90.SQLite Distinct 关键字
91.SQLite Having 子句
92.SQLite Group By
93.SQLite Join
94.SQLite 约束
95.SQLite PRAGMA
96.SQLite 事务
97.SQLite 视图
98.SQLite Truncate Table
99.SQLite Alter 命令
100.SQLite Indexed By