Get Column Size
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
public class Main {
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')");
ResultSet rsColumns = null;
DatabaseMetaData meta = conn.getMetaData();
rsColumns = meta.getColumns(null, null, "survey", null);
while (rsColumns.next()) {
String columnName = rsColumns.getString("COLUMN_NAME");
System.out.println("column name=" + columnName);
String columnType = rsColumns.getString("TYPE_NAME");
System.out.println("type:" + columnType);
int size = rsColumns.getInt("COLUMN_SIZE");
System.out.println("size:" + size);
int nullable = rsColumns.getInt("NULLABLE");
if (nullable == DatabaseMetaData.columnNullable) {
System.out.println("nullable true");
} else {
System.out.println("nullable false");
}
int position = rsColumns.getInt("ORDINAL_POSITION");
System.out.println("position:" + position);
}
st.close();
conn.close();
}
private static Connection getHSQLConnection() throws Exception {
Class.forName("org.hsqldb.jdbcDriver");
System.out.println("Driver Loaded.");
String url = "jdbc:hsqldb:data/tutorial";
return DriverManager.getConnection(url, "sa", "");
}
public static Connection getMySqlConnection() throws Exception {
String driver = "org.gjt.mm.mysql.Driver";
String url = "jdbc:mysql://localhost/demo2s";
String username = "oost";
String password = "oost";
Class.forName(driver);
Connection conn = DriverManager.getConnection(url, username, password);
return conn;
}
public static Connection getOracleConnection() throws Exception {
String driver = "oracle.jdbc.driver.OracleDriver";
String url = "jdbc:oracle:thin:@localhost:1521:caspian";
String username = "mp";
String password = "mp2";
Class.forName(driver); // load Oracle driver
Connection conn = DriverManager.getConnection(url, username, password);
return conn;
}
}
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