sqlite数据库接口封装_sqlite3查询接口封装

头文件

#pragma once
#define SQLITE_HAS_CODEC

/*!
 * \file Sqlite.h
 * \date 2023/02/28 10:15
 *
 * \author 56389
 * Contact: user@company.com
 *
 * \brief 
 *
 * sqlite数据库访问
 *
 * \note
*/
#include "sqlite\sqlite3.h"
#include "CParamBind.h"
#include <string>
#include <iostream>
#include <map>
#include <vector>
#include <unordered_map>
#include <codecvt>
using std::map;
using std::vector;
using std::unordered_map;
using std::string;
using std::cout;
using std::endl;
typedef vector<std::map<std::string, std::string>> SqliteSelectResult;
class Sqlite
{
public:
    Sqlite(const std::string& strFileName);
    ~Sqlite();

    bool Exec(const std::string& sql);
    bool Query(const std::string& sql, SqliteSelectResult& selectResult);
    bool Begin();
    bool Commit();
    bool Vacuum();//数据库磁盘整理
public:
    bool Open();
    bool Close();
    static int select_cb(void* data, int cNum, char* column_values[], char* column_names[]);

public:
    static std::string utf8_to_gbk(const std::string& str);

    static std::string gbk_to_utf8(const std::string& str);
private:
    sqlite3* m_sqlite;
    std::string m_passwd;
    std::string dbFileName;
};

class SigleSqlite
{
public:
    ~SigleSqlite() { instance = nullptr; }

    static Sqlite* GetInstance()
    {
        if (instance == nullptr)
            instance = new Sqlite("xxxxxxx.db");
        return instance;
    }
    static void Destroy()
    {
        if (instance != nullptr)
        {
            delete instance;
        }
    }
private:
    static Sqlite* instance;
};
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78

cpp

#include <Windows.h>
#include "Sqlite.h"
#include "CGoogleLog.h"
#pragma comment(lib,"sqlite3_x64.lib")
Sqlite* SigleSqlite::instance = nullptr;
Sqlite::Sqlite(const std::string& strFileName)
{
    m_passwd = "20230427";
    dbFileName = strFileName;
    Open();
}
Sqlite::~Sqlite()
{
    //sqlite3_close(m_sqlite);
    Close();
}

bool Sqlite::Open()
{
    string errMsg = "";
    int ret = sqlite3_open(dbFileName.c_str(), &m_sqlite);
    if (SQLITE_OK == ret)
    {
        if (SQLITE_OK == sqlite3_key(m_sqlite, m_passwd.c_str(), m_passwd.size()))
        {
            LOG(INFO) << "sqlite3_key success!";
            return true;
        }
    }

    errMsg = sqlite3_errmsg(m_sqlite);
    LOG(FATAL) << "sqlite3_open error: " << errMsg;
    return false;
}

bool Sqlite::Exec(const std::string& sql)
{
   //LOG(INFO)<<sql;
   LOG(INFO) << utf8_to_gbk(sql);
    
    string errMsg = "";
    char* cerrMsg = nullptr;
    //string utf8Sql = TransCode::Asci2Utf8(sql);
    int ret = sqlite3_exec(m_sqlite, sql.c_str(), 0, 0, &cerrMsg);
    if (SQLITE_OK == ret)
    {
        return true;
    }

    errMsg = cerrMsg;
    sqlite3_free(cerrMsg);

    int retryTimes = 0;
    while (retryTimes < 5 && errMsg == "database is locked")
    {
        Sleep(100 * (retryTimes + 1));
        int ret = sqlite3_exec(m_sqlite, sql.c_str(), 0, 0, &cerrMsg);
        if (SQLITE_OK == ret)
        {
            errMsg = " retryTimes: " + std::to_string(retryTimes + 1);
            LOG(ERROR) << utf8_to_gbk(sql) << ": " << errMsg;
            return true;
        }
        errMsg = cerrMsg;
        sqlite3_free(cerrMsg);
        retryTimes++;
    }
    //LOG(ERROR) << utf8_to_gbk(sql) << ": " << errMsg;
    return false;
}

int Sqlite::select_cb(void* data, int cNum, char* column_values[], char* column_names[])
{
    SqliteSelectResult* selectResult = static_cast<SqliteSelectResult*>(data);
    map<string, string> record;
    for (int i = 0; i < cNum; i++)
    {
        if (column_values[i])
        {
            //record[column_names[i]] = TransCode::Utf82Asci(column_values[i]);
            record[column_names[i]] = column_values[i];
        }
        else
        {
            record[column_names[i]] = "NULL";
        }
    }
    selectResult->push_back(record);

    return 0;
}

std::string Sqlite::utf8_to_gbk(const std::string& str)
{
    std::wstring_convert<std::codecvt_utf8<wchar_t> > conv;
    std::wstring tmp_wstr = conv.from_bytes(str);

    //GBK locale name in windows
    const char* GBK_LOCALE_NAME = ".936";

    std::wstring_convert<std::codecvt_byname<wchar_t, char, mbstate_t>> convert(new std::codecvt_byname<wchar_t, char, mbstate_t>(GBK_LOCALE_NAME));
    return convert.to_bytes(tmp_wstr);
}

std::string Sqlite::gbk_to_utf8(const std::string& str)
{
    //GBK locale name in windows
    const char* GBK_LOCALE_NAME = ".936";
    std::wstring_convert<std::codecvt_byname<wchar_t, char, mbstate_t>> convert(new std::codecvt_byname<wchar_t, char, mbstate_t>(GBK_LOCALE_NAME));
    std::wstring tmp_wstr = convert.from_bytes(str);

    std::wstring_convert<std::codecvt_utf8<wchar_t>> cv2;
    return cv2.to_bytes(tmp_wstr);
}

bool Sqlite::Query(const std::string& sql, SqliteSelectResult& selectResult)
{
    LOG(INFO) << sql;
    std::string errMsg = "";
    char* cerrMsg = nullptr;
    //string utf8Sql = TransCode::Asci2Utf8(sql);
    int ret = sqlite3_exec(m_sqlite, sql.c_str(), Sqlite::select_cb, (void*)&selectResult, &cerrMsg);
    if (SQLITE_OK == ret)
    {
        return true;
    }

    errMsg = cerrMsg;
    if (cerrMsg != nullptr)
    {
        sqlite3_free(cerrMsg);
    }

    int retryTimes = 0;
    while (retryTimes < 5 && errMsg == "database is locked")
    {
        Sleep(100 * (retryTimes + 1));
        int ret = sqlite3_exec(m_sqlite, sql.c_str(), Sqlite::select_cb, (void*)&selectResult, &cerrMsg);
        if (SQLITE_OK == ret)
        {
            errMsg = " retryTimes: " + std::to_string(retryTimes + 1);
            LOG(ERROR) << sql << ": " << errMsg;
            return true;
        }
        errMsg = cerrMsg;
        sqlite3_free(cerrMsg);
        retryTimes++;
    }
    LOG(ERROR) << sql << ": " << errMsg;
    return false;
}

bool Sqlite::Close()
{
    if (SQLITE_OK == sqlite3_close(m_sqlite))
    {
        LOG(INFO) << "sqlite3_close success";
        return true;
    }
    else
    {
        LOG(INFO) << "sqlite3_close failed";

        return false;
    }
}
bool Sqlite::Begin()
{
    std::string errMsg;
    char* cerrMsg = nullptr;
    int rc = sqlite3_exec(m_sqlite, "begin;", NULL, 0, &cerrMsg);
    if (rc != SQLITE_OK)
    {
        errMsg = cerrMsg;
        sqlite3_free(cerrMsg);
        LOG(ERROR) << "begin: " << errMsg;
        return false;
    }
    return true;
}

bool Sqlite::Commit()
{
    std::string errMsg;
    char* cerrMsg = nullptr;
    int rc = sqlite3_exec(m_sqlite, "commit;", NULL, 0, &cerrMsg);
    if (rc != SQLITE_OK)
    {
        errMsg = cerrMsg;
        sqlite3_free(cerrMsg);
        LOG(ERROR) << "commit: " << errMsg;
        return false;
    }
    return true;

    /* sqlite3_exec(m_sqlite, "commit;", NULL, 0, 0);*/
}

bool Sqlite::Vacuum()
{
    return Exec("VACUUM");
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203

sql绑定代码CParamBind.h

#pragma once
#ifndef __C_PARAM_BIND_H__
#define __C_PARAM_BIND_H__
#include <iostream>
#include <string>
using namespace std;
namespace ParamBind
{
    //************************************
// Method:    ReplaceSlot 绑定字符串参数到sql中
// FullName:  ReplaceSlot
// Access:    public
// Returns:   :type
// Qualifier:
// Parameter: std::string & strStateMent
// Parameter: T t
//************************************
    template <typename T>
    typename std::enable_if<std::is_same<char*, T>::value || std::is_same<const char*, T>::value>::type
        ReplaceSlot(std::string& strStateMent, T t)
    {
        int nPos = strStateMent.find_first_of('?');
        strStateMent.replace(nPos, 1, "'" + std::string(t) + "'");
    }

    //************************************
    // Method:    ReplaceSlot 绑定数值参数到sql中
    // FullName:  CMySql::ReplaceSlot
    // Access:    public
    // Returns:   :type
    // Qualifier:
    // Parameter: std::string & strStateMent
    // Parameter: T t
    //************************************
    template <typename T>
    typename  std::enable_if<std::is_integral<T>::value>::type ReplaceSlot(std::string& strStateMent, T t)
    {
        int nPos = strStateMent.find_first_of('?');
        std::string strValue = std::to_string(t);
        strStateMent.replace(nPos, 1, strValue);
    }

    //************************************
    // Method:    BindParams 参数递归展开终止
    // FullName:  CMySql::BindParams
    // Access:    public
    // Returns:   int
    // Qualifier:
    // Parameter: std::string & strStateMent
    //************************************
    inline int BindParams(std::string& strStateMent)
    {
        return 0;
    }

    //************************************
    // Method:    BindParams  递归展开不定长参数，同时进行值绑定
    // FullName:  CMySql::BindParams
    // Access:    public
    // Returns:   int
    // Qualifier:
    // Parameter: std::string & strStateMent
    // Parameter: T & & first
    // Parameter: Args & & ... args
    //************************************
    template <typename T, typename... Args>
    inline std::string BindParams(std::string& strStateMent, T&&  first, Args&&... args)
    {
        //参数展开时替换占位符
        string str1 = strStateMent;
        ReplaceSlot(str1, first);
        strStateMent = str1;
        BindParams(strStateMent, std::forward<Args>(args)...);
        std::string res = strStateMent;
        return res;
    }
}
#endif
**示例:
std::string sql = insert into table(?,?,?,?);
std::string sqlRes = BindParams(sql, "dfs",3, "df",5);**
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81