parent
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commit
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GPG Key ID:
0F69A0A2FBEE98A0
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package me.lensfrex.manager.sqlite; |
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public class DataTypes { |
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public static final String SQL_DATA_TYPE_NUMBER = "int"; |
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public static final String SQL_DATA_TYPE_TEXT = "text"; |
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public static final String SQL_DATA_TYPE_REAL = "real"; |
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public static final String SQL_DATA_TYPE_NULL = "null"; |
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} |
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package me.lensfrex.manager.sqlite; |
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import java.sql.Connection; |
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import java.sql.DriverManager; |
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import java.sql.SQLException; |
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import java.sql.Statement; |
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import java.util.ArrayList; |
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import java.util.HashMap; |
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import java.util.Map; |
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/** |
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* SQL操作的简单封装... |
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* 试图手动封装SQL操作... |
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* 有BUG？这就对了 |
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* SQL语句仍在学习中... |
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* SQL语句拼接怎么这么麻烦... |
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*/ |
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public class SQLiteTool { |
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private static final String DATABASE_LOCATION = "student.db"; |
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private Connection dbConnection; |
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private Statement statement; |
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/** |
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* 初始化数据库文件，若成功则返回true，若数据库初始化出现异常则返回false。 |
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* 不保证数据库中存在欲操作的表，需手动确认。 |
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* |
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* @return 初始化是否成功，若成功则返回true，若数据库初始化出现异常则返回false。 |
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*/ |
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public boolean initDatabase() { |
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try { |
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Class.forName("org.sqlite.JDBC"); |
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this.dbConnection = DriverManager.getConnection("jdbc:sqlite:" + DATABASE_LOCATION); |
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this.statement = dbConnection.createStatement(); |
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return true; |
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} catch (Exception e) { |
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System.out.println("Some errors happens when initialing database."); |
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e.printStackTrace(); |
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return false; |
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} |
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} |
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/** |
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* 向数据库中创建一个表。 |
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* |
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* @param tableName 数据库表的名称 |
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* @param columns 数据库表列的参数，map中key为列的名称，value为其相应的数据类型。 |
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* @throws SQLException 如果创建表的过程中发生错误 |
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*/ |
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public void createTable(String tableName, HashMap<String, String> columns) throws SQLException { |
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StringBuilder stringBuilder = new StringBuilder("create table %s ("); |
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for (Map.Entry<String, String> column : columns.entrySet()) { |
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stringBuilder.append(String.format("%s %s, ", column.getKey(), column.getValue())); |
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} |
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String createStatement = stringBuilder |
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.replace(stringBuilder.lastIndexOf(","), stringBuilder.lastIndexOf(",") + 2, ")") |
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.toString(); |
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statement.executeUpdate(createStatement); |
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} |
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/** |
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* 查询表格是否存在。 |
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* |
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* @param tableName 表格名 |
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* @return 存在，返回true，否则返回false； |
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*/ |
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public boolean isTableExists(String tableName) { |
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String tryStatement = String.format("select * from %s", tableName); |
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try { |
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statement.executeQuery(tryStatement); |
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return true; |
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} catch (Exception e) { |
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return false; |
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} |
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} |
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/** |
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* 向数据库里插入一条记录。 |
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* |
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* @param table 表格名 |
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* @param values 每一列的数据值，文本类型数据应使用单引号 ' 括住 |
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* @throws SQLException 如果执行的过程中发生错误 |
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*/ |
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public void insert(String table, String... values) throws SQLException { |
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StringBuilder stringBuilder = new StringBuilder(); |
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stringBuilder.append("insert into ").append(table).append(" values ( "); |
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for (String value : values) { |
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stringBuilder.append(value).append(' '); |
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} |
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stringBuilder.append(")"); |
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statement.executeUpdate(stringBuilder.toString()); |
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} |
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} |
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@ -0,0 +1,3 @@ |
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Manifest-Version: 1.0 |
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Main-Class: me.lensfrex.manager.Main |
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@ -1,5 +1,6 @@ |
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---------------------------------------------------------------- |
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欢迎来到 SManager-S |
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源代码：https://git.ciduid.top/lensfrex/SManager-S |
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---------------------------------------------------------------- |
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您想做什么： |
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1. 添加学生 |
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@ -1,5 +1,6 @@ |
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---------------------------------------------------------------- |
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Welcome to SManager-S |
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Source code: https://git.ciduid.top/lensfrex/SManager-S |
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---------------------------------------------------------------- |
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Do you want to: |
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1. Input record |
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