mirror of
https://github.com/seaweedfs/seaweedfs.git
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add jdbc
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chrislu
@@ -0,0 +1,308 @@
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package com.seaweedfs.jdbc.examples;
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import java.sql.*;
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import java.util.Properties;
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/**
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* Complete example demonstrating SeaweedFS JDBC driver usage
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*/
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public class SeaweedFSJDBCExample {
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public static void main(String[] args) {
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// JDBC URL for SeaweedFS
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String url = "jdbc:seaweedfs://localhost:8089/default";
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try {
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// 1. Load the driver (optional - auto-registration via META-INF/services)
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Class.forName("com.seaweedfs.jdbc.SeaweedFSDriver");
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System.out.println("✓ SeaweedFS JDBC Driver loaded successfully");
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// 2. Connect to SeaweedFS
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System.out.println("\n📡 Connecting to SeaweedFS...");
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Connection conn = DriverManager.getConnection(url);
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System.out.println("✓ Connected to: " + url);
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// 3. Get database metadata
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DatabaseMetaData dbMeta = conn.getMetaData();
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System.out.println("\n📊 Database Information:");
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System.out.println(" Database: " + dbMeta.getDatabaseProductName());
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System.out.println(" Version: " + dbMeta.getDatabaseProductVersion());
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System.out.println(" Driver: " + dbMeta.getDriverName() + " v" + dbMeta.getDriverVersion());
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System.out.println(" JDBC Version: " + dbMeta.getJDBCMajorVersion() + "." + dbMeta.getJDBCMinorVersion());
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System.out.println(" Read-only: " + dbMeta.isReadOnly());
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// 4. List available databases/schemas
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System.out.println("\n🗄️ Available Databases:");
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ResultSet catalogs = dbMeta.getCatalogs();
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while (catalogs.next()) {
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System.out.println(" • " + catalogs.getString("TABLE_CAT"));
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}
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catalogs.close();
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// 5. Execute basic queries
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System.out.println("\n🔍 Executing SQL Queries:");
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Statement stmt = conn.createStatement();
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// Show databases
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System.out.println("\n 📋 SHOW DATABASES:");
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ResultSet rs = stmt.executeQuery("SHOW DATABASES");
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while (rs.next()) {
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System.out.println(" " + rs.getString(1));
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}
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rs.close();
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// Show tables (topics)
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System.out.println("\n 📋 SHOW TABLES:");
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rs = stmt.executeQuery("SHOW TABLES");
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ResultSetMetaData rsmd = rs.getMetaData();
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int columnCount = rsmd.getColumnCount();
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// Print headers
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for (int i = 1; i <= columnCount; i++) {
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System.out.print(String.format("%-20s", rsmd.getColumnName(i)));
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}
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System.out.println();
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System.out.println("-".repeat(20 * columnCount));
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// Print rows
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while (rs.next()) {
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for (int i = 1; i <= columnCount; i++) {
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System.out.print(String.format("%-20s", rs.getString(i)));
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}
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System.out.println();
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}
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rs.close();
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// 6. Query a specific topic (if exists)
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String topicQuery = "SELECT * FROM test_topic LIMIT 5";
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System.out.println("\n 📋 " + topicQuery + ":");
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try {
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rs = stmt.executeQuery(topicQuery);
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rsmd = rs.getMetaData();
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columnCount = rsmd.getColumnCount();
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// Print column headers
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for (int i = 1; i <= columnCount; i++) {
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System.out.print(String.format("%-15s", rsmd.getColumnName(i)));
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}
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System.out.println();
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System.out.println("-".repeat(15 * columnCount));
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// Print data rows
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int rowCount = 0;
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while (rs.next() && rowCount < 5) {
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for (int i = 1; i <= columnCount; i++) {
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String value = rs.getString(i);
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if (value != null && value.length() > 12) {
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value = value.substring(0, 12) + "...";
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}
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System.out.print(String.format("%-15s", value != null ? value : "NULL"));
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}
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System.out.println();
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rowCount++;
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}
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if (rowCount == 0) {
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System.out.println(" (No data found)");
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}
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rs.close();
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} catch (SQLException e) {
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System.out.println(" ⚠️ Topic 'test_topic' not found: " + e.getMessage());
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}
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// 7. Demonstrate aggregation queries
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System.out.println("\n 🧮 Aggregation Example:");
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try {
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rs = stmt.executeQuery("SELECT COUNT(*) as total_records FROM test_topic");
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if (rs.next()) {
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System.out.println(" Total records: " + rs.getLong("total_records"));
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}
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rs.close();
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} catch (SQLException e) {
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System.out.println(" ⚠️ Aggregation example skipped: " + e.getMessage());
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}
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// 8. Demonstrate PreparedStatement
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System.out.println("\n 📝 PreparedStatement Example:");
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String preparedQuery = "SELECT * FROM test_topic WHERE id > ? LIMIT ?";
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try {
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PreparedStatement pstmt = conn.prepareStatement(preparedQuery);
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pstmt.setLong(1, 100);
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pstmt.setInt(2, 3);
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System.out.println(" Query: " + preparedQuery);
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System.out.println(" Parameters: id > 100, LIMIT 3");
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rs = pstmt.executeQuery();
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rsmd = rs.getMetaData();
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columnCount = rsmd.getColumnCount();
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int count = 0;
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while (rs.next()) {
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if (count == 0) {
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// Print headers for first row
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for (int i = 1; i <= columnCount; i++) {
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System.out.print(String.format("%-15s", rsmd.getColumnName(i)));
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}
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System.out.println();
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System.out.println("-".repeat(15 * columnCount));
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}
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for (int i = 1; i <= columnCount; i++) {
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String value = rs.getString(i);
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if (value != null && value.length() > 12) {
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value = value.substring(0, 12) + "...";
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}
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System.out.print(String.format("%-15s", value != null ? value : "NULL"));
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}
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System.out.println();
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count++;
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}
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if (count == 0) {
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System.out.println(" (No records match criteria)");
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}
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rs.close();
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pstmt.close();
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} catch (SQLException e) {
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System.out.println(" ⚠️ PreparedStatement example skipped: " + e.getMessage());
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}
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// 9. System columns example
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System.out.println("\n 🔧 System Columns Example:");
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try {
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rs = stmt.executeQuery("SELECT id, _timestamp_ns, _key, _source FROM test_topic LIMIT 3");
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rsmd = rs.getMetaData();
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columnCount = rsmd.getColumnCount();
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// Print headers
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for (int i = 1; i <= columnCount; i++) {
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System.out.print(String.format("%-20s", rsmd.getColumnName(i)));
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}
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System.out.println();
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System.out.println("-".repeat(20 * columnCount));
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int count = 0;
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while (rs.next()) {
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for (int i = 1; i <= columnCount; i++) {
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String value = rs.getString(i);
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if (value != null && value.length() > 17) {
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value = value.substring(0, 17) + "...";
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}
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System.out.print(String.format("%-20s", value != null ? value : "NULL"));
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}
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System.out.println();
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count++;
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}
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if (count == 0) {
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System.out.println(" (No data available for system columns demo)");
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}
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rs.close();
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} catch (SQLException e) {
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System.out.println(" ⚠️ System columns example skipped: " + e.getMessage());
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}
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// 10. Connection properties example
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System.out.println("\n⚙️ Connection Properties:");
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System.out.println(" Auto-commit: " + conn.getAutoCommit());
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System.out.println(" Read-only: " + conn.isReadOnly());
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System.out.println(" Transaction isolation: " + conn.getTransactionIsolation());
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System.out.println(" Catalog: " + conn.getCatalog());
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// 11. Clean up
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stmt.close();
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conn.close();
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System.out.println("\n✅ SeaweedFS JDBC Example completed successfully!");
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System.out.println("\n💡 Next Steps:");
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System.out.println(" • Try connecting with DBeaver or other JDBC tools");
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System.out.println(" • Use in your Java applications with connection pooling");
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System.out.println(" • Integrate with BI tools like Tableau or Power BI");
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System.out.println(" • Build data pipelines using SeaweedFS as a data source");
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} catch (ClassNotFoundException e) {
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System.err.println("❌ SeaweedFS JDBC Driver not found: " + e.getMessage());
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System.err.println(" Make sure seaweedfs-jdbc.jar is in your classpath");
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} catch (SQLException e) {
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System.err.println("❌ Database error: " + e.getMessage());
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System.err.println(" Make sure SeaweedFS JDBC server is running:");
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System.err.println(" weed jdbc -port=8089 -master=localhost:9333");
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} catch (Exception e) {
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System.err.println("❌ Unexpected error: " + e.getMessage());
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e.printStackTrace();
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}
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}
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/**
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* Example with connection pooling using HikariCP
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*/
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public static void connectionPoolingExample() {
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try {
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// This would require HikariCP dependency
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/*
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HikariConfig config = new HikariConfig();
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config.setJdbcUrl("jdbc:seaweedfs://localhost:8089/default");
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config.setMaximumPoolSize(10);
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config.setMinimumIdle(2);
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config.setConnectionTimeout(30000);
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config.setIdleTimeout(600000);
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HikariDataSource dataSource = new HikariDataSource(config);
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try (Connection conn = dataSource.getConnection()) {
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// Use connection from pool
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Statement stmt = conn.createStatement();
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ResultSet rs = stmt.executeQuery("SELECT COUNT(*) FROM my_topic");
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if (rs.next()) {
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System.out.println("Record count: " + rs.getLong(1));
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}
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rs.close();
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stmt.close();
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}
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dataSource.close();
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*/
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System.out.println("Connection pooling example (commented out - requires HikariCP dependency)");
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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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* Example configuration for different database tools
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*/
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public static void printToolConfiguration() {
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System.out.println("\n🛠️ Database Tool Configuration:");
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System.out.println("\n📊 DBeaver:");
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System.out.println(" 1. New Connection → Generic JDBC");
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System.out.println(" 2. URL: jdbc:seaweedfs://localhost:8089/default");
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System.out.println(" 3. Driver Class: com.seaweedfs.jdbc.SeaweedFSDriver");
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System.out.println(" 4. Add seaweedfs-jdbc.jar to Libraries");
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System.out.println("\n💻 IntelliJ DataGrip:");
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System.out.println(" 1. New Data Source → Generic");
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System.out.println(" 2. URL: jdbc:seaweedfs://localhost:8089/default");
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System.out.println(" 3. Add Driver: seaweedfs-jdbc.jar");
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System.out.println(" 4. Class: com.seaweedfs.jdbc.SeaweedFSDriver");
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System.out.println("\n📈 Tableau:");
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System.out.println(" 1. Connect to Data → More... → Generic JDBC");
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System.out.println(" 2. URL: jdbc:seaweedfs://localhost:8089/default");
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System.out.println(" 3. Driver Path: /path/to/seaweedfs-jdbc.jar");
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System.out.println(" 4. Class Name: com.seaweedfs.jdbc.SeaweedFSDriver");
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System.out.println("\n☕ Java Application:");
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System.out.println(" Class.forName(\"com.seaweedfs.jdbc.SeaweedFSDriver\");");
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System.out.println(" Connection conn = DriverManager.getConnection(");
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System.out.println(" \"jdbc:seaweedfs://localhost:8089/default\");");
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}
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}
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