写在前面：
因为工作时候经常遇到半路接手项目的情况，由于年代久远，数据库字典这块经常缺失。故写此篇，以便复用，也希望对大家有点帮助。
随笔内容不高级，如有不妥，不吝指正。
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第一步：查询数据库
查询语句：
SELECT pretab.TABLE_NAME AS 表名,pretab.TABLE_COMMENT AS 表释义,precol.COLUMN_NAME AS 字段名,precol.COLUMN_TYPE AS 字段类型,precol.COLUMN_DEFAULT AS 字段默认值,precol.COLUMN_COMMENT AS 表字段释义 FROM information_schema.`TABLES` AS pretab RIGHT JOIN information_schema.`COLUMNS` AS precol ON precol.TABLE_NAME=pretab.TABLE_NAME WHERE pretab.TABLE_SCHEMA ="此处填写库名";
结果图示：
第二步：导出查询结果
导出txt：
导出结果：
第三步：一键整合至excel
运行下方代码：
1 import java.io.BufferedReader;
2 import java.io.FileInputStream;
3 import java.io.FileOutputStream;
4 import java.io.InputStreamReader;
5
6 import org.apache.poi.hssf.usermodel.HSSFCell;
7 import org.apache.poi.hssf.usermodel.HSSFRow;
8 import org.apache.poi.hssf.usermodel.HSSFSheet;
9 import org.apache.poi.hssf.usermodel.HSSFWorkbook;
10 import org.apache.poi.ss.util.CellRangeAddress;
11
12 /**
13 * 重新整合数据库导出的文件,形成可视化的数据库字典
14 *
15 * @author ruran
16 * @since 2019年7月4日 下午3:25:13
17 */
18 public class reArrangeFromSQLtxt {
19
20 /*
21 * 导出的数据来源 SELECT pretab.TABLE_NAME AS 表名,pretab.TABLE_COMMENT AS 表释义,
22 * precol.COLUMN_NAME AS 字段名,precol.COLUMN_TYPE AS 字段类型,
23 * precol.COLUMN_DEFAULT AS 字段默认值,precol.COLUMN_COMMENT AS 表字段释义 FROM
24 * information_schema.`TABLES` AS pretab RIGHT JOIN
25 * information_schema.`COLUMNS` AS precol ON
26 * precol.TABLE_NAME=pretab.TABLE_NAME WHERE pretab.TABLE_SCHEMA ="此处填写库名";
27 */
28 public static void main(String[] args) {
29 String url = "F:\\2-ME\\中心+部门\\1-scrs学习整理区\\数据库整理 - 暂划区\\";
30 reArrangeToExcelFromSQLtxt(url, "preScrssit", "@");
31 }
32
33 /**
34 * 整理出数据导入到excel中
35 *
36 * @author ruran
37 * @since 2019年7月22日 下午2:06:27
38 * @param url
39 * @param fileName
40 * @param splitStr
41 */
42 private static void reArrangeToExcelFromSQLtxt(String url, String fileName, String splitStr) {
43
44 String fileType = ".txt";
45 String forFileName = fileName + "_bak";
46 String forFileType = ".xls";
47
48 try (FileInputStream fis = new FileInputStream(url + fileName + fileType);
49 InputStreamReader isr = new InputStreamReader(fis);
50 BufferedReader br = new BufferedReader(isr);
51
52 FileOutputStream fos = new FileOutputStream(url + forFileName + forFileType);) {
53
54 String readLine = "";
55 String tableName = "";
56 String tableComment = "";
57 HSSFWorkbook currentWorkbook = new HSSFWorkbook();
58 HSSFSheet currentSheet = currentWorkbook.createSheet("数据库字典");
59 HSSFRow currentRow = null;
60 HSSFCell currentCell = null;
61 int rowIndex = -1;
62 while (isNotBlank((readLine = br.readLine()))) {
63 String[] lineSplit = readLine.split(splitStr);
64 int lineSplitLenght = lineSplit.length;
65 String currentTableName = "";
66 if (lineSplitLenght > 0) {
67 currentTableName = lineSplit[0];
68 }
69 if (currentTableName.equals(tableName)) {
70 currentRow = currentSheet.createRow(++rowIndex);
71 // 输出列数据
72 for (int i = 2; i < 6; i++) {
73 currentCell = currentRow.createCell((i - 2));
74 if (lineSplitLenght > i) {
75 currentCell.setCellValue(lineSplit[i]);
76 }
77 }
78 // 开启下次循环
79 continue;
80 }
81 String currentTableComment = "";
82 if (lineSplitLenght > 1) {
83 currentTableComment = lineSplit[1];
84 }
85 // 表名和表注释赋值
86 tableName = currentTableName;
87 tableComment = currentTableComment;
88 // 输入空行
89 currentSheet.createRow(++rowIndex);
90 // 切表-表名（注释）
91 currentRow = currentSheet.createRow(++rowIndex);
92 for (int i = 0; i < 4; i++) {
93 currentCell = currentRow.createCell(i);
94 if (i == 0) {
95 currentCell.setCellValue(tableName + "(" + tableComment + ")");
96 }
97 }
98 CellRangeAddress region = new CellRangeAddress(rowIndex, rowIndex, 0, 3);
99 currentSheet.addMergedRegion(region);
100
101 // 切表-标题栏
102 currentRow = currentSheet.createRow(++rowIndex);
103 currentCell = currentRow.createCell(0);
104 currentCell.setCellValue("列名");
105 currentCell = currentRow.createCell(1);
106 currentCell.setCellValue("类型");
107 currentCell = currentRow.createCell(2);
108 currentCell.setCellValue("默认值");
109 currentCell = currentRow.createCell(3);
110 currentCell.setCellValue("释义");
111 currentRow = currentSheet.createRow(++rowIndex);
112 // 切表第一列
113 for (int i = 2; i < 6; i++) {
114 currentCell = currentRow.createCell((i - 2));
115 if (lineSplitLenght > i) {
116 currentCell.setCellValue(lineSplit[i]);
117 }
118 }
119 }
120 currentWorkbook.write(fos);
121 } catch (Exception e) {
122 e.printStackTrace();
123 }
124 }
125
126 /**
127 * 字符串判空
128 *
129 * @author ruran
130 * @since 2019年7月23日 下午2:11:28
131 * @param str
132 * @return
133 */
134 private static boolean isNotBlank(String str) {
135 if (null == str) {
136 return false;
137 }
138 if (str.trim().length() == 0) {
139 return false;
140 }
141 return true;
142 }
143
144 }
运行结果：
原文地址：https://www.cnblogs.com/ruanian/p/11231395.html
时间： 2024-10-29 04:18:28