Example usage for java.sql Connection close

Introduction

In this page you can find the example usage for java.sql Connection close.

Prototype

void close() throws SQLException;

Source Link

Document

Releases this Connection object's database and JDBC resources immediately instead of waiting for them to be automatically released.

Usage

From source file:JdbcConnect.java

public static void main(String[] args) throws Exception {
    Connection conn1 = null;
    Connection conn2 = null;/*from   ww  w. j av  a 2  s  . com*/
    Connection conn3 = null;

    Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance();
    String jdbcUrl = "jdbc:odbc:authors";

    String user = "yourName";
    String pwd = "mypwd";

    conn1 = DriverManager.getConnection(jdbcUrl);
    if (conn1 != null) {
        System.out.println("Connection 1 successful!");
    }
    Properties prop = new Properties();
    prop.put("user", user);
    prop.put("password", pwd);

    conn2 = DriverManager.getConnection(jdbcUrl, prop);
    if (conn2 != null) {
        System.out.println("Connection 2 successful!");
    }
    conn3 = DriverManager.getConnection(jdbcUrl, user, pwd);
    if (conn3 != null) {
        System.out.println("Connection 3 successful!");
    }
    conn1.close();
    conn2.close();
    conn3.close();
    if (conn1.isClosed()) {
        System.out.println("Connection 1 is closed");
    }

    if (conn2.isClosed()) {
        System.out.println("Connection 2 is closed");
    }
    if (conn3.isClosed()) {
        System.out.println("Connection 3 is closed");
    }

    conn1.close();
    conn2.close();
    conn3.close();

}

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From source file:TableTypes.java

public static void main(String args[]) {

    String url = "jdbc:mySubprotocol:myDataSource";
    Connection con;

    try {/*from   ww w.  ja va  2s  .  co  m*/
        Class.forName("myDriver.ClassName");

    } catch (java.lang.ClassNotFoundException e) {
        System.err.print("ClassNotFoundException: ");
        System.err.println(e.getMessage());
    }

    try {
        con = DriverManager.getConnection(url, "myLogin", "myPassword");

        DatabaseMetaData dbmd = con.getMetaData();
        String dbmsName = dbmd.getDatabaseProductName();
        ResultSet rs = dbmd.getTableTypes();
        System.out.print("The following types of tables are ");
        System.out.println("available in " + dbmsName + ":  ");

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

        rs.close();
        con.close();

    } catch (SQLException ex) {
        System.err.print("SQLException: ");
        System.err.println(ex.getMessage());
    }
}

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From source file:DemoGetGeneratedKeysMySQL.java

public static void main(String[] args) throws Exception {
    Connection conn = getConnection();
    Statement stmt = null;//from ww  w .  j  a  va 2  s  .  c o m
    ResultSet rs = null;
    try {
        conn = getConnection();
        stmt = conn.createStatement();
        stmt.executeUpdate("insert into animals_table (name) values('newName')");
        rs = stmt.getGeneratedKeys();
        while (rs.next()) {
            ResultSetMetaData rsMetaData = rs.getMetaData();
            int columnCount = rsMetaData.getColumnCount();

            for (int i = 1; i <= columnCount; i++) {
                String key = rs.getString(i);
                System.out.println("key " + i + " is " + key);
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
        System.exit(1);
    } finally {
        try {
            rs.close();
            stmt.close();
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

---

From source file:SelectRecordsUsingPreparedStatement.java

public static void main(String[] args) {
    ResultSet rs = null;//  w  w  w  .j  a  va2s .  c  o  m
    Connection conn = null;
    PreparedStatement pstmt = null;
    try {
        conn = getConnection();
        String query = "select deptno, deptname, deptloc from dept where deptno > ?";

        pstmt = conn.prepareStatement(query); // create a statement
        pstmt.setInt(1, 1001); // set input parameter
        rs = pstmt.executeQuery();
        // extract data from the ResultSet
        while (rs.next()) {
            int dbDeptNumber = rs.getInt(1);
            String dbDeptName = rs.getString(2);
            String dbDeptLocation = rs.getString(3);
            System.out.println(dbDeptNumber + "\t" + dbDeptName + "\t" + dbDeptLocation);
        }
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            rs.close();
            pstmt.close();
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

---

From source file:DemoPreparedStatementSetClob.java

public static void main(String[] args) throws Exception {
    String id = "0001";
    String newID = "0002";

    ResultSet rs = null;//  w  w w.  ja v a 2 s  .  c o m
    Connection conn = null;
    PreparedStatement pstmt = null;
    try {
        conn = getConnection();
        // begin transaction
        conn.setAutoCommit(false);
        String query1 = "select clob_column from clob_table where id = ?";
        pstmt = conn.prepareStatement(query1);
        pstmt.setString(1, id);
        rs = pstmt.executeQuery();
        rs.next();
        java.sql.Clob clob = (java.sql.Clob) rs.getObject(1);
        String query = "insert into clob_table(id, clob_column) values(?, ?)";
        pstmt = conn.prepareStatement(query);
        pstmt.setString(1, newID);
        pstmt.setClob(2, clob);

        int rowCount = pstmt.executeUpdate();
        System.out.println("rowCount=" + rowCount);
        conn.commit();
    } finally {
        rs.close();
        pstmt.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();//  w  ww .  j ava 2s . c  o m
    ResultSet rs = st.executeQuery("SELECT * FROM survey");

    int rsConcurrency = rs.getConcurrency();
    if (rsConcurrency == java.sql.ResultSet.CONCUR_READ_ONLY) {
        System.out.println("java.sql.ResultSet.CONCUR_READ_ONLY");
    } else if (rsConcurrency == java.sql.ResultSet.CONCUR_UPDATABLE) {
        System.out.println("java.sql.ResultSet.CONCUR_UPDATABLE");
    } else {
        // it is an error

    }

    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_SENSITIVE, ResultSet.CONCUR_READ_ONLY);

    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.executeUpdate("insert into survey (id,name ) values (3,'Tom')");
    ResultSet rs = st.executeQuery("SELECT * FROM survey");

    // move to the end of the result set
    rs.last();/*from w  w w .  j a va2 s  .  com*/

    // get the row number of the last row, which is also the row count
    int rowCount = rs.getRow();
    System.out.println(rowCount);

    // now you may move the cursor to the front of this ResultSet object,
    // just before the first row
    rs.beforeFirst();

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

---

From source file:Main.java

public static void main(String[] args) throws Exception {
    Connection conn = getConnection();
    conn.setAutoCommit(false);//from  ww w . j  a v  a2  s.  co  m
    Statement st = conn.createStatement();

    st.executeUpdate("create table survey (id int, name VARCHAR(30) );");

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

    PreparedStatement pstmt = conn.prepareStatement(INSERT_RECORD);
    pstmt.setString(1, "1");
    pstmt.setString(2, "name1");
    pstmt.addBatch();

    pstmt.setString(1, "2");
    pstmt.setString(2, "name2");
    pstmt.addBatch();

    // execute the batch
    int[] updateCounts = pstmt.executeBatch();

    checkUpdateCounts(updateCounts);

    // since there were no errors, commit
    conn.commit();

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

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

---

From source file:Main.java

public static void main(String[] args) throws Exception {
    Connection conn = getHSQLConnection();

    DatabaseMetaData dbmd = conn.getMetaData();

    ResultSet rs = dbmd.getTypeInfo();
    while (rs.next()) {
        String typeName = rs.getString("TYPE_NAME");
        short dataType = rs.getShort("DATA_TYPE");
        String createParams = rs.getString("CREATE_PARAMS");
        int nullable = rs.getInt("NULLABLE");
        boolean caseSensitive = rs.getBoolean("CASE_SENSITIVE");
        System.out.println("DBMS type " + typeName + ":");
        System.out.println("     java.sql.Types:  " + dataType);
        System.out.print("     parameters used to create: ");
        System.out.println(createParams);
        System.out.println("     nullable?:  " + nullable);
        System.out.print("     case sensitive?:  ");
        System.out.println(caseSensitive);
        System.out.println("");

    }//from w ww .  j  a  va2s.  c  om
    conn.close();
}

---

From source file:Main.java

public static void main(String[] args) throws Exception {
    Connection conn = getMySqlConnection();
    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')");
    DatabaseMetaData meta = conn.getMetaData();
    ResultSet rs = meta.getExportedKeys(conn.getCatalog(), null, "survey");
    while (rs.next()) {
        String fkTableName = rs.getString("FKTABLE_NAME");
        String fkColumnName = rs.getString("FKCOLUMN_NAME");
        int fkSequence = rs.getInt("KEY_SEQ");
        System.out.println("getExportedKeys(): fkTableName=" + fkTableName);
        System.out.println("getExportedKeys(): fkColumnName=" + fkColumnName);
        System.out.println("getExportedKeys(): fkSequence=" + fkSequence);
    }//from  w ww .j a  v  a 2 s.c o m

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

---

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