Example usage for java.sql Statement executeQuery

List of usage examples for java.sql Statement executeQuery

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Introduction

In this page you can find the example usage for java.sql Statement executeQuery.

Prototype

ResultSet executeQuery(String sql) throws SQLException;

Source Link

Document

Executes the given SQL statement, which returns a single ResultSet object.

Usage

From source file:MainClass.java

public static void main(String[] args) {
    Connection connection = null;
    Statement statement = null;
    ResultSet resultSet = null;/*from  ww w  . ja  v  a  2 s  . c o m*/

    try {
        connection = getConnection();
        // Do work with connection
        statement = connection.createStatement();
        String selectEmployeesSQL = "SELECT * FROM employees";
        resultSet = statement.executeQuery(selectEmployeesSQL);

        while (resultSet.next()) {
            printEmployee(resultSet);
        }
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        if (resultSet != null) {
            try {
                resultSet.close();
            } catch (SQLException e) {
            } // nothing we can do
        }
        if (statement != null) {
            try {
                statement.close();
            } catch (SQLException e) {
            } // nothing we can do
        }
        if (connection != null) {
            try {
                connection.close();
            } catch (SQLException e) {
            } // nothing we can do
        }
    }
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    Connection conn = getMySqlConnection();
    System.out.println("Got Connection.");
    Statement st = conn.createStatement();
    st.executeUpdate("drop table survey;");
    st.executeUpdate("create table survey (id int,name varchar(30));");
    st.executeUpdate("insert into survey (id,name ) values (1,'nameValue')");

    st = conn.createStatement();// www. j  a v a  2s .  co  m
    ResultSet rs = st.executeQuery("SELECT * FROM survey");

    ResultSetMetaData rsMetaData = rs.getMetaData();

    int numberOfColumns = rsMetaData.getColumnCount();
    System.out.println("resultSet MetaData column Count=" + numberOfColumns);

    for (int i = 1; i <= numberOfColumns; i++) {
        System.out.println("column MetaData ");
        System.out.println("column number " + i);
        System.out.println(rsMetaData.getColumnDisplaySize(i));
        System.out.println(rsMetaData.getColumnLabel(i));
        System.out.println(rsMetaData.getColumnName(i));
        System.out.println(rsMetaData.getColumnType(i));
        System.out.println(rsMetaData.getColumnTypeName(i));
        System.out.println(rsMetaData.getColumnClassName(i));
        System.out.println(rsMetaData.getTableName(i));
        System.out.println(rsMetaData.getPrecision(i));
        System.out.println(rsMetaData.getScale(i));
        System.out.println(rsMetaData.isAutoIncrement(i));
        System.out.println(rsMetaData.isCurrency(i));
        System.out.println(rsMetaData.isWritable(i));
        System.out.println(rsMetaData.isDefinitelyWritable(i));
        System.out.println(rsMetaData.isNullable(i));
        System.out.println(rsMetaData.isReadOnly(i));
        System.out.println(rsMetaData.isCaseSensitive(i));
        System.out.println(rsMetaData.isSearchable(i));
        System.out.println(rsMetaData.isSigned(i));
        System.out.println(rsMetaData.getCatalogName(i));
        System.out.println(rsMetaData.getSchemaName(i));
    }
    st.close();
    conn.close();
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    Connection conn = getConnection();
    Statement st = conn.createStatement();

    st.executeUpdate("create table survey (id int, myDate TIMESTAMP );");

    String INSERT_RECORD = "insert into survey(id) values(?)";

    PreparedStatement pstmt = conn.prepareStatement(INSERT_RECORD);
    pstmt.setString(1, "1");
    pstmt.executeUpdate();//from   ww  w  . j  a v a 2s .  co  m

    ResultSet rs = st.executeQuery("SELECT * FROM survey");
    outputResultSet(rs);

    pstmt.setString(1, "2");
    pstmt.executeUpdate();

    rs = st.executeQuery("SELECT * FROM survey");
    outputResultSet(rs);

    rs.close();
    st.close();
    conn.close();
}

From source file:ResultSetMetaDataExample.java

public static void main(String args[]) throws Exception {
    Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
    Connection con = DriverManager.getConnection("jdbc:odbc:Inventory", "", "");
    Statement stmt = con.createStatement();

    boolean notDone = true;
    String sqlStr = null;/*from  w  w w .  j a v  a  2 s  .  co m*/
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

    while (notDone) {
        sqlStr = br.readLine();
        if (sqlStr.startsWith("SELECT") || sqlStr.startsWith("select")) {
            ResultSet rs = stmt.executeQuery(sqlStr);
            ResultSetMetaData rsmd = rs.getMetaData();
            int columnCount = rsmd.getColumnCount();
            for (int x = 1; x <= columnCount; x++) {
                String columnName = rsmd.getColumnName(x);
                System.out.print(columnName);
            }
            while (rs.next()) {
                for (int x = 1; x <= columnCount; x++) {
                    if (rsmd.getColumnTypeName(x).compareTo("CURRENCY") == 0)
                        System.out.print("$");
                    String resultStr = rs.getString(x);
                    System.out.print(resultStr + "\t");
                }
            }
        } else if (sqlStr.startsWith("exit"))
            notDone = false;
    }
    stmt.close();
    con.close();
}

From source file:ex4.java

public static void main(String[] params) {
    CommandLine commandLine = null;/*  ww  w . j a va 2  s  .c  o m*/
    String sqlpath = "", host = "", port = "3306", username = "", password = "", database = "";
    Boolean query = false;
    Option option_sql = Option.builder("s").argName("sql").hasArg()
            .desc("Path to a file containing a valid MySQL sql statement").build();
    Option option_hostname = Option.builder("h").argName("host").hasArg().desc("ClearDB MySQL Hostname")
            .build();
    Option option_port = Option.builder("n").argName("port").hasArg().desc("ClearDB MySQL Port").build();
    Option option_username = Option.builder("u").argName("username").hasArg().desc("ClearDB MySQL Username")
            .build();
    Option option_password = Option.builder("p").argName("password").hasArg().desc("ClearDB MySQL Password")
            .build();
    Option option_dbname = Option.builder("d").argName("dbname").hasArg().desc("ClearDB MySQL Database Name")
            .build();
    Option option_help = Option.builder("w").argName("wanthelp").hasArg().desc("Help").build();
    Option option_query = Option.builder().longOpt("query").desc("Query type SQL Statement").build();
    Options options = new Options();
    CommandLineParser parser = new DefaultParser();

    options.addOption(option_sql);
    options.addOption(option_hostname);
    options.addOption(option_port);
    options.addOption(option_username);
    options.addOption(option_password);
    options.addOption(option_dbname);
    options.addOption(option_query);
    options.addOption(option_help);

    try {
        commandLine = parser.parse(options, params);
    } catch (MissingOptionException e) {
        help(options);
    } catch (MissingArgumentException e) {
        help(options);
    } catch (ParseException e) {
        System.out.println(e);
    }

    if (commandLine.hasOption("w") || params.length == 0) {
        help(options);
    }

    if (commandLine.hasOption("s")) {
        sqlpath = commandLine.getOptionValue("s");
    } else {
        System.out.println("Missing path to a SQL statement file");
        help(options);
    }
    if (commandLine.hasOption("h")) {
        host = commandLine.getOptionValue("h");
    } else {
        System.out.println("Missing ClearDB hostname (e.g. us-cdbr-iron-east-??.cleardb.net)");
        help(options);
    }
    if (commandLine.hasOption("n")) {
        port = commandLine.getOptionValue("n");
    } else {
        System.out.println("Missing ClearDB Port Value.  Defaulting to 3306");
    }
    if (commandLine.hasOption("u")) {
        username = commandLine.getOptionValue("u");
    } else {
        System.out.println("Missing ClearDB Username");
        help(options);
    }
    if (commandLine.hasOption("p")) {
        password = commandLine.getOptionValue("p");
    } else {
        System.out.println("Missing ClearDB Password");
        help(options);
    }
    if (commandLine.hasOption("d")) {
        database = commandLine.getOptionValue("d");
    } else {
        System.out.println("Missing ClearDB Database Name");
        help(options);
    }

    if (commandLine.hasOption("query")) {
        query = true;
    }

    String connectionURL = new StringBuilder().append("jdbc:mysql://").append(host).append(":").append(port)
            .append("/").append(database).append("?reconnect=true").toString();

    try {
        Class.forName("com.mysql.jdbc.Driver");
    } catch (ClassNotFoundException e) {
        System.out.println(e);
    }

    try {
        Connection con = DriverManager.getConnection(connectionURL, username, password);
        Statement stmt = con.createStatement();
        if (query) {
            System.out.println("Querying target MySQL DB ...");
            ResultSet rs = stmt.executeQuery(readFile(sqlpath, Charset.defaultCharset()));
            while (rs.next())
                System.out.println(rs.getInt("emp_no") + "  " + rs.getDate("birth_date") + "  "
                        + rs.getString("first_name") + "  " + rs.getString("last_name") + "  "
                        + rs.getString("gender") + "  " + rs.getDate("hire_date"));
        } else {
            System.out.println("Updating target MySQL DB ...");
            int result = stmt.executeUpdate(readFile(sqlpath, Charset.defaultCharset()));
            System.out.println(result);
        }
        con.close();
    } catch (Exception e) {
        System.out.println(e);
    }
}

From source file:GetColumnNamesFromResultSet_Oracle.java

public static void main(String[] args) {
    Connection conn = null;/*  ww w.  ja  v a 2 s.  co m*/
    Statement stmt = null;
    ResultSet rs = null;
    try {
        conn = getConnection();
        // prepare query
        String query = "select id, name, age from employees";
        // create a statement
        stmt = conn.createStatement();
        // execute query and return result as a ResultSet
        rs = stmt.executeQuery(query);
        // get the column names from the ResultSet
        getColumnNames(rs);
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        // release database resources
        try {
            rs.close();
            stmt.close();
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

From source file:GetColumnNamesFromResultSet_MySQL.java

public static void main(String[] args) {
    Connection conn = null;//from  w  w w . j a v a  2 s .  co m
    Statement stmt = null;
    ResultSet rs = null;
    try {
        conn = getConnection();
        // prepare query
        String query = "select id, name, age from employees";
        // create a statement
        stmt = conn.createStatement();
        // execute query and return result as a ResultSet
        rs = stmt.executeQuery(query);
        // get the column names from the ResultSet
        getColumnNames(rs);
    } catch (Exception e) {
        e.printStackTrace();
        System.exit(1);
    } finally {
        // release database resources
        try {
            rs.close();
            stmt.close();
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    Connection conn = getConnection();
    Statement stmt = conn.createStatement();

    stmt.executeUpdate("create table survey (id DECIMAL, name BINARY );");

    String sql = "INSERT INTO survey (id) VALUES(?)";
    PreparedStatement pstmt = conn.prepareStatement(sql);

    pstmt.setBigDecimal(1, new BigDecimal("1.00000"));

    // insert the data
    pstmt.executeUpdate();//from   ww w .  j a va 2 s .  c o m

    ResultSet rs = stmt.executeQuery("SELECT * FROM survey");
    while (rs.next()) {
        System.out.print(rs.getString(1));
    }

    rs.close();
    stmt.close();
    conn.close();
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    Connection conn = getConnection();
    Statement st = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);

    st.executeUpdate("create table survey (id int,name varchar(30));");
    st.executeUpdate("insert into survey (id,name ) values (1,'nameValue')");
    st.executeUpdate("insert into survey (id,name ) values (2,null)");
    st = conn.createStatement();/*www . jav  a 2 s. co  m*/
    ResultSet rs = st.executeQuery("SELECT * FROM survey");

    while (rs.next()) {
        String name = rs.getString(2);
        System.out.println(name);
    }

    rs.close();
    st.close();
    conn.close();

}

From source file:Main.java

public static void main(String[] args) throws Exception {
    Connection conn = getConnection();
    Statement st = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);

    st.executeUpdate("create table survey (id int,name varchar(30));");
    st.executeUpdate("insert into survey (id,name ) values (1,'nameValue')");
    st.executeUpdate("insert into survey (id,name ) values (2,null)");
    st = conn.createStatement();//from  w ww. jav a2  s  .  co m
    ResultSet rs = st.executeQuery("SELECT * FROM survey");

    while (rs.next()) {
        String name = rs.getString("name");
        System.out.println(name);
    }

    rs.close();
    st.close();
    conn.close();

}