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DML.java
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<component name="libraryTable">
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<library name="junit-4.12">
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<CLASSES>
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<root url="jar://$APPLICATION_HOME_DIR$/lib/junit-4.12.jar!/" />
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<root url="jar://$APPLICATION_HOME_DIR$/lib/hamcrest-core-1.3.jar!/" />
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</CLASSES>
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<JAVADOC />
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<SOURCES />
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</library>
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</component>
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<component name="libraryTable">
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<library name="libs">
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<CLASSES>
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<root url="file://$PROJECT_DIR$/libs" />
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</CLASSES>
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<JAVADOC />
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<SOURCES />
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<jarDirectory url="file://$PROJECT_DIR$/libs" recursive="false" />
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</library>
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</component>
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import java.sql.*;
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import org.junit.Test;
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public class DML {
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// 数据库连接字符串
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private static final String URL = "jdbc:sqlite:D:/uml/db/dbuml.db3";
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@Test
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public void create() {
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try (Connection conn = DriverManager.getConnection(URL);
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Statement stmt = conn.createStatement()) {
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// 创建数据表的 SQL 语句
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String sql = "create table if not exists xslist (" +
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"id integer primary key AUTOINCREMENT not null ," +
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"sno text not null," +
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"sname text," +
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"lx1 integer," +
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"lx2 integer" +
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");";
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// 执行 SQL 语句
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stmt.execute(sql);
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System.out.println("数据表 创建成功");
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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@Test
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public void deleteAll() {
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try (Connection conn = DriverManager.getConnection(URL);
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Statement stmt = conn.createStatement()) {
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// 删除所有记录的 SQL 语句
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String sql = "DELETE FROM xslist";
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// 执行 SQL 语句
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int result = stmt.executeUpdate(sql);
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System.out.println("删除了 " + result + " 条记录");
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} catch (SQLException e) {
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e.printStackTrace();
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}
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}
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}
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import java.sql.Connection;
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import java.sql.DriverManager;
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import java.sql.DatabaseMetaData;
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public class jdbc {
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public static void main(String[] args) {
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// 定义数据库连接参数
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String driver = "org.sqlite.JDBC"; // SQLite JDBC驱动
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String url = "jdbc:sqlite:./db/dbuml.db3"; // 数据库文件路径
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String user = ""; // SQLite不需要用户名
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String password = ""; // SQLite不需要密码
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Connection conn = null;
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try {
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// 1. 加载注册驱动
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Class.forName(driver);
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// 2. 连接数据库
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conn = DriverManager.getConnection(url, user, password);
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// 3. 输出数据库信息
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if (conn != null) {
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DatabaseMetaData metaData = conn.getMetaData();
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System.out.println("数据库名称: " + metaData.getDatabaseProductName());
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System.out.println("数据库版本号: " + metaData.getDatabaseProductVersion());
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System.out.println("数据库URL: " + metaData.getURL());
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}
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} catch (Exception e) {
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e.printStackTrace();
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} finally {
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// 4. 关闭连接
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try {
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if (conn != null) {
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conn.close();
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}
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}
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}
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