一和二

如何做一个国产数据库一
如何做一个国产数据库二

1、数据结构重新定义

再次重新定义数据结构

typedef struct sdata
{uint32_t index;char vardata[128];
}sdata;typedef struct sdata_index
{uint32_t index;uint32_t offset;
}sdata_index;//增加的数据库上下文环境结构体
typedef struct db_context
{char v_tablename[256];sdata_index *v_index = NULL;uint32_t v_tindex = 0;uint32_t v_nindex = 0;
}db_context;

2、增删改查

此次增加了一个数据库的db_context 结构体，包含文件名称，索引内存保存，两个index的内存保存，在增加四个api函数，以前的函数变成工具，定义tool.h 和tool.cpp.

增加api.h 和api.cpp,增加四个函数声明：

int   Insert(void *data,db_context *v_context);
int   Delete(void *key, db_context *v_context);
int   Update(void *key, void *data, db_context *v_context);
void *Select(void *key, db_context *v_context);

今天实现Insert 函数，暂不测试，因为单元测试需要单独一个教程才行

xx xx xx xx | xx xx xx xx | xx xx xx xx – xx xx xx xx
4字节最大索引| 4字节当前索引 4bytes index 4bytes offset
data
…
*/
//2M的空间做索引
//uint32_t indext;//索引总长度
//uint32_t indexn;//索引长度,内容为x个索引 indexn <= indext

2.1 实现索引读的函数

#define INDEX_BYTES 2 * 1024 * 1024
//int index_num = INDEX_BYTES / sizeof(int) * 2; //max index number is 162144sdata_index* bfile_read_index(const char * file, uint32_t &indext,uint32_t &indexn)
{size_t nr;indext = 0;indexn = 0;FILE * fp = fopen(file, "rb");if (fp == NULL)return NULL;//读取最大的index值容量nr = fread(&indext, sizeof(uint32_t), 1, fp);if (nr == 0){fclose(fp);return NULL;}//读取存储的索引值nr = fread(&indexn, sizeof(uint32_t), 1, fp);if (nr == 0){fclose(fp);return NULL;}//4字节索引号 4字节偏移地址uint8_t * index = (uint8_t*)malloc(indexn * sizeof(uint32_t) * 2);nr = fread(index, indexn * sizeof(uint32_t) * 2, 1, fp);if (nr == 0){fclose(fp);free(index);return NULL;}return (sdata_index*)index;
}

2.2 实现初始化数据库的函数

该函数并不完整，等待完善，有很多需要注意的地方

int Initialize(const char *tname, db_context *context)
{if (context == NULL)return -1;strcpy(context->v_tablename,tname);if (context->v_index == NULL)context->v_index = bfile_read_index(tname,             /*filename*/context->v_tindex, context->v_nindex);if (context->v_index == NULL)return -1;return 0;
}

2.3实现插入

整个增加的流程为：

#mermaid-svg-LnXl96nwWtNZ1uYc .label{font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family);fill:#333;color:#333}#mermaid-svg-LnXl96nwWtNZ1uYc .label text{fill:#333}#mermaid-svg-LnXl96nwWtNZ1uYc .node rect,#mermaid-svg-LnXl96nwWtNZ1uYc .node circle,#mermaid-svg-LnXl96nwWtNZ1uYc .node ellipse,#mermaid-svg-LnXl96nwWtNZ1uYc .node polygon,#mermaid-svg-LnXl96nwWtNZ1uYc .node path{fill:#ECECFF;stroke:#9370db;stroke-width:1px}#mermaid-svg-LnXl96nwWtNZ1uYc .node .label{text-align:center;fill:#333}#mermaid-svg-LnXl96nwWtNZ1uYc .node.clickable{cursor:pointer}#mermaid-svg-LnXl96nwWtNZ1uYc .arrowheadPath{fill:#333}#mermaid-svg-LnXl96nwWtNZ1uYc .edgePath .path{stroke:#333;stroke-width:1.5px}#mermaid-svg-LnXl96nwWtNZ1uYc .flowchart-link{stroke:#333;fill:none}#mermaid-svg-LnXl96nwWtNZ1uYc .edgeLabel{background-color:#e8e8e8;text-align:center}#mermaid-svg-LnXl96nwWtNZ1uYc .edgeLabel rect{opacity:0.9}#mermaid-svg-LnXl96nwWtNZ1uYc .edgeLabel span{color:#333}#mermaid-svg-LnXl96nwWtNZ1uYc .cluster rect{fill:#ffffde;stroke:#aa3;stroke-width:1px}#mermaid-svg-LnXl96nwWtNZ1uYc .cluster text{fill:#333}#mermaid-svg-LnXl96nwWtNZ1uYc div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family);font-size:12px;background:#ffffde;border:1px solid #aa3;border-radius:2px;pointer-events:none;z-index:100}#mermaid-svg-LnXl96nwWtNZ1uYc .actor{stroke:#ccf;fill:#ECECFF}#mermaid-svg-LnXl96nwWtNZ1uYc text.actor>tspan{fill:#000;stroke:none}#mermaid-svg-LnXl96nwWtNZ1uYc .actor-line{stroke:grey}#mermaid-svg-LnXl96nwWtNZ1uYc .messageLine0{stroke-width:1.5;stroke-dasharray:none;stroke:#333}#mermaid-svg-LnXl96nwWtNZ1uYc .messageLine1{stroke-width:1.5;stroke-dasharray:2, 2;stroke:#333}#mermaid-svg-LnXl96nwWtNZ1uYc #arrowhead path{fill:#333;stroke:#333}#mermaid-svg-LnXl96nwWtNZ1uYc .sequenceNumber{fill:#fff}#mermaid-svg-LnXl96nwWtNZ1uYc #sequencenumber{fill:#333}#mermaid-svg-LnXl96nwWtNZ1uYc #crosshead path{fill:#333;stroke:#333}#mermaid-svg-LnXl96nwWtNZ1uYc .messageText{fill:#333;stroke:#333}#mermaid-svg-LnXl96nwWtNZ1uYc .labelBox{stroke:#ccf;fill:#ECECFF}#mermaid-svg-LnXl96nwWtNZ1uYc .labelText,#mermaid-svg-LnXl96nwWtNZ1uYc .labelText>tspan{fill:#000;stroke:none}#mermaid-svg-LnXl96nwWtNZ1uYc .loopText,#mermaid-svg-LnXl96nwWtNZ1uYc .loopText>tspan{fill:#000;stroke:none}#mermaid-svg-LnXl96nwWtNZ1uYc .loopLine{stroke-width:2px;stroke-dasharray:2, 2;stroke:#ccf;fill:#ccf}#mermaid-svg-LnXl96nwWtNZ1uYc .note{stroke:#aa3;fill:#fff5ad}#mermaid-svg-LnXl96nwWtNZ1uYc .noteText,#mermaid-svg-LnXl96nwWtNZ1uYc .noteText>tspan{fill:#000;stroke:none}#mermaid-svg-LnXl96nwWtNZ1uYc .activation0{fill:#f4f4f4;stroke:#666}#mermaid-svg-LnXl96nwWtNZ1uYc .activation1{fill:#f4f4f4;stroke:#666}#mermaid-svg-LnXl96nwWtNZ1uYc .activation2{fill:#f4f4f4;stroke:#666}#mermaid-svg-LnXl96nwWtNZ1uYc .mermaid-main-font{font-family:"trebuchet ms", verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-LnXl96nwWtNZ1uYc .section{stroke:none;opacity:0.2}#mermaid-svg-LnXl96nwWtNZ1uYc .section0{fill:rgba(102,102,255,0.49)}#mermaid-svg-LnXl96nwWtNZ1uYc .section2{fill:#fff400}#mermaid-svg-LnXl96nwWtNZ1uYc .section1,#mermaid-svg-LnXl96nwWtNZ1uYc .section3{fill:#fff;opacity:0.2}#mermaid-svg-LnXl96nwWtNZ1uYc .sectionTitle0{fill:#333}#mermaid-svg-LnXl96nwWtNZ1uYc .sectionTitle1{fill:#333}#mermaid-svg-LnXl96nwWtNZ1uYc .sectionTitle2{fill:#333}#mermaid-svg-LnXl96nwWtNZ1uYc .sectionTitle3{fill:#333}#mermaid-svg-LnXl96nwWtNZ1uYc .sectionTitle{text-anchor:start;font-size:11px;text-height:14px;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-LnXl96nwWtNZ1uYc .grid .tick{stroke:#d3d3d3;opacity:0.8;shape-rendering:crispEdges}#mermaid-svg-LnXl96nwWtNZ1uYc .grid .tick text{font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-LnXl96nwWtNZ1uYc .grid path{stroke-width:0}#mermaid-svg-LnXl96nwWtNZ1uYc .today{fill:none;stroke:red;stroke-width:2px}#mermaid-svg-LnXl96nwWtNZ1uYc .task{stroke-width:2}#mermaid-svg-LnXl96nwWtNZ1uYc .taskText{text-anchor:middle;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-LnXl96nwWtNZ1uYc .taskText:not([font-size]){font-size:11px}#mermaid-svg-LnXl96nwWtNZ1uYc .taskTextOutsideRight{fill:#000;text-anchor:start;font-size:11px;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-LnXl96nwWtNZ1uYc .taskTextOutsideLeft{fill:#000;text-anchor:end;font-size:11px}#mermaid-svg-LnXl96nwWtNZ1uYc .task.clickable{cursor:pointer}#mermaid-svg-LnXl96nwWtNZ1uYc .taskText.clickable{cursor:pointer;fill:#003163 !important;font-weight:bold}#mermaid-svg-LnXl96nwWtNZ1uYc .taskTextOutsideLeft.clickable{cursor:pointer;fill:#003163 !important;font-weight:bold}#mermaid-svg-LnXl96nwWtNZ1uYc .taskTextOutsideRight.clickable{cursor:pointer;fill:#003163 !important;font-weight:bold}#mermaid-svg-LnXl96nwWtNZ1uYc .taskText0,#mermaid-svg-LnXl96nwWtNZ1uYc .taskText1,#mermaid-svg-LnXl96nwWtNZ1uYc .taskText2,#mermaid-svg-LnXl96nwWtNZ1uYc .taskText3{fill:#fff}#mermaid-svg-LnXl96nwWtNZ1uYc .task0,#mermaid-svg-LnXl96nwWtNZ1uYc .task1,#mermaid-svg-LnXl96nwWtNZ1uYc .task2,#mermaid-svg-LnXl96nwWtNZ1uYc .task3{fill:#8a90dd;stroke:#534fbc}#mermaid-svg-LnXl96nwWtNZ1uYc .taskTextOutside0,#mermaid-svg-LnXl96nwWtNZ1uYc .taskTextOutside2{fill:#000}#mermaid-svg-LnXl96nwWtNZ1uYc .taskTextOutside1,#mermaid-svg-LnXl96nwWtNZ1uYc .taskTextOutside3{fill:#000}#mermaid-svg-LnXl96nwWtNZ1uYc .active0,#mermaid-svg-LnXl96nwWtNZ1uYc .active1,#mermaid-svg-LnXl96nwWtNZ1uYc .active2,#mermaid-svg-LnXl96nwWtNZ1uYc .active3{fill:#bfc7ff;stroke:#534fbc}#mermaid-svg-LnXl96nwWtNZ1uYc .activeText0,#mermaid-svg-LnXl96nwWtNZ1uYc .activeText1,#mermaid-svg-LnXl96nwWtNZ1uYc .activeText2,#mermaid-svg-LnXl96nwWtNZ1uYc .activeText3{fill:#000 !important}#mermaid-svg-LnXl96nwWtNZ1uYc .done0,#mermaid-svg-LnXl96nwWtNZ1uYc .done1,#mermaid-svg-LnXl96nwWtNZ1uYc .done2,#mermaid-svg-LnXl96nwWtNZ1uYc .done3{stroke:grey;fill:#d3d3d3;stroke-width:2}#mermaid-svg-LnXl96nwWtNZ1uYc .doneText0,#mermaid-svg-LnXl96nwWtNZ1uYc .doneText1,#mermaid-svg-LnXl96nwWtNZ1uYc .doneText2,#mermaid-svg-LnXl96nwWtNZ1uYc .doneText3{fill:#000 !important}#mermaid-svg-LnXl96nwWtNZ1uYc .crit0,#mermaid-svg-LnXl96nwWtNZ1uYc .crit1,#mermaid-svg-LnXl96nwWtNZ1uYc .crit2,#mermaid-svg-LnXl96nwWtNZ1uYc .crit3{stroke:#f88;fill:red;stroke-width:2}#mermaid-svg-LnXl96nwWtNZ1uYc .activeCrit0,#mermaid-svg-LnXl96nwWtNZ1uYc .activeCrit1,#mermaid-svg-LnXl96nwWtNZ1uYc .activeCrit2,#mermaid-svg-LnXl96nwWtNZ1uYc .activeCrit3{stroke:#f88;fill:#bfc7ff;stroke-width:2}#mermaid-svg-LnXl96nwWtNZ1uYc .doneCrit0,#mermaid-svg-LnXl96nwWtNZ1uYc .doneCrit1,#mermaid-svg-LnXl96nwWtNZ1uYc .doneCrit2,#mermaid-svg-LnXl96nwWtNZ1uYc .doneCrit3{stroke:#f88;fill:#d3d3d3;stroke-width:2;cursor:pointer;shape-rendering:crispEdges}#mermaid-svg-LnXl96nwWtNZ1uYc .milestone{transform:rotate(45deg) scale(0.8, 0.8)}#mermaid-svg-LnXl96nwWtNZ1uYc .milestoneText{font-style:italic}#mermaid-svg-LnXl96nwWtNZ1uYc .doneCritText0,#mermaid-svg-LnXl96nwWtNZ1uYc .doneCritText1,#mermaid-svg-LnXl96nwWtNZ1uYc .doneCritText2,#mermaid-svg-LnXl96nwWtNZ1uYc .doneCritText3{fill:#000 !important}#mermaid-svg-LnXl96nwWtNZ1uYc .activeCritText0,#mermaid-svg-LnXl96nwWtNZ1uYc .activeCritText1,#mermaid-svg-LnXl96nwWtNZ1uYc .activeCritText2,#mermaid-svg-LnXl96nwWtNZ1uYc .activeCritText3{fill:#000 !important}#mermaid-svg-LnXl96nwWtNZ1uYc .titleText{text-anchor:middle;font-size:18px;fill:#000;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-LnXl96nwWtNZ1uYc g.classGroup text{fill:#9370db;stroke:none;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family);font-size:10px}#mermaid-svg-LnXl96nwWtNZ1uYc g.classGroup text .title{font-weight:bolder}#mermaid-svg-LnXl96nwWtNZ1uYc g.clickable{cursor:pointer}#mermaid-svg-LnXl96nwWtNZ1uYc g.classGroup rect{fill:#ECECFF;stroke:#9370db}#mermaid-svg-LnXl96nwWtNZ1uYc g.classGroup line{stroke:#9370db;stroke-width:1}#mermaid-svg-LnXl96nwWtNZ1uYc .classLabel .box{stroke:none;stroke-width:0;fill:#ECECFF;opacity:0.5}#mermaid-svg-LnXl96nwWtNZ1uYc .classLabel .label{fill:#9370db;font-size:10px}#mermaid-svg-LnXl96nwWtNZ1uYc .relation{stroke:#9370db;stroke-width:1;fill:none}#mermaid-svg-LnXl96nwWtNZ1uYc .dashed-line{stroke-dasharray:3}#mermaid-svg-LnXl96nwWtNZ1uYc #compositionStart{fill:#9370db;stroke:#9370db;stroke-width:1}#mermaid-svg-LnXl96nwWtNZ1uYc #compositionEnd{fill:#9370db;stroke:#9370db;stroke-width:1}#mermaid-svg-LnXl96nwWtNZ1uYc #aggregationStart{fill:#ECECFF;stroke:#9370db;stroke-width:1}#mermaid-svg-LnXl96nwWtNZ1uYc #aggregationEnd{fill:#ECECFF;stroke:#9370db;stroke-width:1}#mermaid-svg-LnXl96nwWtNZ1uYc #dependencyStart{fill:#9370db;stroke:#9370db;stroke-width:1}#mermaid-svg-LnXl96nwWtNZ1uYc #dependencyEnd{fill:#9370db;stroke:#9370db;stroke-width:1}#mermaid-svg-LnXl96nwWtNZ1uYc #extensionStart{fill:#9370db;stroke:#9370db;stroke-width:1}#mermaid-svg-LnXl96nwWtNZ1uYc #extensionEnd{fill:#9370db;stroke:#9370db;stroke-width:1}#mermaid-svg-LnXl96nwWtNZ1uYc .commit-id,#mermaid-svg-LnXl96nwWtNZ1uYc .commit-msg,#mermaid-svg-LnXl96nwWtNZ1uYc .branch-label{fill:lightgrey;color:lightgrey;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-LnXl96nwWtNZ1uYc .pieTitleText{text-anchor:middle;font-size:25px;fill:#000;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-LnXl96nwWtNZ1uYc .slice{font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-LnXl96nwWtNZ1uYc g.stateGroup text{fill:#9370db;stroke:none;font-size:10px;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-LnXl96nwWtNZ1uYc g.stateGroup text{fill:#9370db;fill:#333;stroke:none;font-size:10px}#mermaid-svg-LnXl96nwWtNZ1uYc g.statediagram-cluster .cluster-label text{fill:#333}#mermaid-svg-LnXl96nwWtNZ1uYc g.stateGroup .state-title{font-weight:bolder;fill:#000}#mermaid-svg-LnXl96nwWtNZ1uYc g.stateGroup rect{fill:#ECECFF;stroke:#9370db}#mermaid-svg-LnXl96nwWtNZ1uYc g.stateGroup line{stroke:#9370db;stroke-width:1}#mermaid-svg-LnXl96nwWtNZ1uYc .transition{stroke:#9370db;stroke-width:1;fill:none}#mermaid-svg-LnXl96nwWtNZ1uYc .stateGroup .composit{fill:white;border-bottom:1px}#mermaid-svg-LnXl96nwWtNZ1uYc .stateGroup .alt-composit{fill:#e0e0e0;border-bottom:1px}#mermaid-svg-LnXl96nwWtNZ1uYc .state-note{stroke:#aa3;fill:#fff5ad}#mermaid-svg-LnXl96nwWtNZ1uYc .state-note text{fill:black;stroke:none;font-size:10px}#mermaid-svg-LnXl96nwWtNZ1uYc .stateLabel .box{stroke:none;stroke-width:0;fill:#ECECFF;opacity:0.7}#mermaid-svg-LnXl96nwWtNZ1uYc .edgeLabel text{fill:#333}#mermaid-svg-LnXl96nwWtNZ1uYc .stateLabel text{fill:#000;font-size:10px;font-weight:bold;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-LnXl96nwWtNZ1uYc .node circle.state-start{fill:black;stroke:black}#mermaid-svg-LnXl96nwWtNZ1uYc .node circle.state-end{fill:black;stroke:white;stroke-width:1.5}#mermaid-svg-LnXl96nwWtNZ1uYc #statediagram-barbEnd{fill:#9370db}#mermaid-svg-LnXl96nwWtNZ1uYc .statediagram-cluster rect{fill:#ECECFF;stroke:#9370db;stroke-width:1px}#mermaid-svg-LnXl96nwWtNZ1uYc .statediagram-cluster rect.outer{rx:5px;ry:5px}#mermaid-svg-LnXl96nwWtNZ1uYc .statediagram-state .divider{stroke:#9370db}#mermaid-svg-LnXl96nwWtNZ1uYc .statediagram-state .title-state{rx:5px;ry:5px}#mermaid-svg-LnXl96nwWtNZ1uYc .statediagram-cluster.statediagram-cluster .inner{fill:white}#mermaid-svg-LnXl96nwWtNZ1uYc .statediagram-cluster.statediagram-cluster-alt .inner{fill:#e0e0e0}#mermaid-svg-LnXl96nwWtNZ1uYc .statediagram-cluster .inner{rx:0;ry:0}#mermaid-svg-LnXl96nwWtNZ1uYc .statediagram-state rect.basic{rx:5px;ry:5px}#mermaid-svg-LnXl96nwWtNZ1uYc .statediagram-state rect.divider{stroke-dasharray:10,10;fill:#efefef}#mermaid-svg-LnXl96nwWtNZ1uYc .note-edge{stroke-dasharray:5}#mermaid-svg-LnXl96nwWtNZ1uYc .statediagram-note rect{fill:#fff5ad;stroke:#aa3;stroke-width:1px;rx:0;ry:0}:root{--mermaid-font-family: '"trebuchet ms", verdana, arial';--mermaid-font-family: "Comic Sans MS", "Comic Sans", cursive}#mermaid-svg-LnXl96nwWtNZ1uYc .error-icon{fill:#522}#mermaid-svg-LnXl96nwWtNZ1uYc .error-text{fill:#522;stroke:#522}#mermaid-svg-LnXl96nwWtNZ1uYc .edge-thickness-normal{stroke-width:2px}#mermaid-svg-LnXl96nwWtNZ1uYc .edge-thickness-thick{stroke-width:3.5px}#mermaid-svg-LnXl96nwWtNZ1uYc .edge-pattern-solid{stroke-dasharray:0}#mermaid-svg-LnXl96nwWtNZ1uYc .edge-pattern-dashed{stroke-dasharray:3}#mermaid-svg-LnXl96nwWtNZ1uYc .edge-pattern-dotted{stroke-dasharray:2}#mermaid-svg-LnXl96nwWtNZ1uYc .marker{fill:#333}#mermaid-svg-LnXl96nwWtNZ1uYc .marker.cross{stroke:#333}:root { --mermaid-font-family: "trebuchet ms", verdana, arial;}#mermaid-svg-LnXl96nwWtNZ1uYc {color: rgba(0, 0, 0, 0.75);font: ;}

打开数据库

初始化读取

读取上次索引信息

写入当次索引+偏移

写入索引量last+1

int Insert(void *data, db_context *context)
{if (context->v_nindex < context->v_tindex){FILE * fp = fopen(context->v_tablename, "wb");if (fp == NULL)return -1;fpos_t pos = 4 + 4 + (context->v_nindex) * (8);fsetpos(fp, &pos);//int last_index = context->v_nindex - 1;uint32_t  indexlast = context->v_index[context->v_nindex - 1].index ;uint32_t  indexinsert = indexlast + 1;size_t n = fwrite(&indexinsert, sizeof(uint32_t), 1, fp);if (n != sizeof(uint32_t)){fclose(fp);return -1;}sdata *pdata = (sdata*)data;size_t vsize = sizeof(pdata->vardata);uint32_t datasize = vsize * indexlast;fpos_t offset = 4 + 4 + INDEX_BYTES + datasize;n = fwrite(&offset, sizeof(uint32_t), 1, fp);if (n != sizeof(uint32_t)){fclose(fp);return -1;}fsetpos(fp, &offset);n = fwrite(data, vsize, 1, fp);if (n != vsize){fclose(fp);return -1;}fpos_t index = sizeof(uint32_t);fsetpos(fp, &index);uint32_t newnindex = context->v_nindex + 1;n = fwrite(&newnindex, sizeof(uint32_t), 1, fp);if (n != sizeof(int)){fclose(fp);return -1;}fclose(fp);return 0;}return -1;
}int   Delete(void *key, db_context *v_context)
{}
int   Update(void *key, void *data, db_context *v_context)
{}
void *Select(void *key, db_context *v_context)
{}

上面说了，先实现增加函数，其他先不实现，也不测试，单元测试需要一个严格的定义和测试用例，此次先为增加流程的初步代码实现，有待完善。

如何做一个国产数据库(三)相关推荐

如何做一个国产数据库(七) 网络传输 java做订阅客户端
如何做一个国产数据库一如何做一个国产数据库二如何做一个国产数据库三如何做一个国产数据库四如何做一个国产数据库五如何做一个国产数据库六 server端协议定义再次强调一下我们的protoco ...
如何做一个国产数据库(六) 网络传输 nodejs做测试客户端
如何做一个国产数据库一如何做一个国产数据库二如何做一个国产数据库三如何做一个国产数据库四如何做一个国产数据库五网络实战服务器我们再四中说过使用tcp进行协议的链接,对我们所定义的协议如果有 ...
如何做一个国产数据库(二)
如果做一个国产数据库一链接承接上文,继续 1.重新定义数据结构 typedef struct sdata {uint32_t index;char vardata[128]; }sdata;type ...
如何做一个国产数据库(四)
网络这次要用到网络了,存储的时候我们都使用网络来输入输出,当然,像本机是可以使用进程间通信的,不过为了简单,我们此次都使用tcp协议. 协议此次使用libuv来做网络的传输,我们首先定一个协议,做 ...
如何做一个国产数据库系统(一)
做国产数据库之二做一个国产数据库做一个数据库系统真的是要懂的是基础,各种基础,网络,文件系统,操作系统,性能,测试,各方面都要懂使用基本方法索引文件+数据文件+ B+ 树 ,hash空间如图 ...
如何用Excel做一个战斗模拟器(三)战斗过程模拟
如何用Excel做一个战斗模拟器(一)升级经验表如何用Excel做一个战斗模拟器(二)属性表目录索引定义战斗子过程定位战斗双方基础属性利用基础属性与战斗公式进行计算战斗过程的运算与输出判 ...
如何做一个mysql数据库_如何创建一个简单的mysql数据库
这篇文章主要介绍了操作MySQL日志的一些方法,对日志的删除操作做了重点讲解,需要的朋友可以参考下. 一.创建数据库注:已经安装好mysql. windows下运行cmd进入命令窗口,本人用的是wi ...
做一个回填数据库的报表
BI 软件市场越来越热闹,但由此也给软件用户带来了"选择恐惧症",在貌似功能类似的情况下,用户会转而关注到底哪款软件更加炫酷.便捷.易上手.但事实上,仍旧有不少实用性的功能是 BI ...
2020年11月国产数据库排行：GaussDB砥砺前行成第八，EsgynDB 4.2亿战绩晋级20强！
编辑说明:国产数据库流行度排行榜,是墨天轮网站根据数据库的受欢迎程度对国产数据库进行排名,排行榜每月更新. 转眼间11月来了,2020年也只剩下1个月左右了,墨天轮2020年11月国产数据库排行榜新鲜 ...

如何做一个国产数据库(三)

一和二