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Major optimization to how MySQL connection is handled.

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This commit is contained in:
nossr50 2012-02-27 05:20:55 -08:00
parent d7d1d0b58d
commit 26c9ba0c3b
1 changed files with 103 additions and 54 deletions
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157
src/main/java/com/gmail/nossr50/Database.java
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@ -29,11 +29,31 @@ import com.gmail.nossr50.config.LoadProperties;
public class Database {
private mcMMO plugin;
private String connectionString;
private String connectionString = "jdbc:mysql://" + LoadProperties.MySQLserverName + ":" + LoadProperties.MySQLport + "/" + LoadProperties.MySQLdbName + "?user=" + LoadProperties.MySQLuserName + "&password=" + LoadProperties.MySQLdbPass;
private boolean isConnected = false;
private Connection conn = null;
public void connect()
{
try
{
System.out.println("[mcMMO] Attempting connection to MySQL...");
conn = DriverManager.getConnection(connectionString);
isConnected = true;
System.out.println("[mcMMO] Connection to MySQL established!");
} catch (SQLException ex)
{
isConnected = false;
ex.printStackTrace();
System.out.println("SQLException: " + ex.getMessage());
System.out.println("SQLState: " + ex.getSQLState());
System.out.println("VendorError: " + ex.getErrorCode());
}
}
public Database(mcMMO instance) {
connect(); //Connect to MySQL
this.plugin = instance;
this.connectionString = "jdbc:mysql://" + LoadProperties.MySQLserverName + ":" + LoadProperties.MySQLport + "/" + LoadProperties.MySQLdbName + "?user=" + LoadProperties.MySQLuserName + "&password=" + LoadProperties.MySQLdbPass;
// Load the driver instance
try {
Class.forName("com.mysql.jdbc.Driver");
@ -118,7 +138,6 @@ public class Database {
ResultSet rs = null;
HashMap<Integer, ArrayList<String>> Rows = new HashMap<Integer, ArrayList<String>>();
try {
Connection conn = DriverManager.getConnection(connectionString);
PreparedStatement stmt = conn.prepareStatement(sql);
if (stmt.executeQuery() != null) {
stmt.executeQuery();
@ -131,7 +150,6 @@ public class Database {
Rows.put(rs.getRow(), Col);
}
}
conn.close();
} catch (SQLException ex) {
System.out.println("Updating mcMMO MySQL tables...");
Write("ALTER TABLE `"+LoadProperties.MySQLtablePrefix + "skills` ADD `fishing` int(10) NOT NULL DEFAULT '0' ;");
@ -141,18 +159,30 @@ public class Database {
// write query
public boolean Write(String sql) {
try {
Connection conn = DriverManager.getConnection(connectionString);
PreparedStatement stmt = conn.prepareStatement(sql);
stmt.executeUpdate();
conn.close();
return true;
} catch (SQLException ex) {
System.out.println("SQLException: " + ex.getMessage());
System.out.println("SQLState: " + ex.getSQLState());
System.out.println("VendorError: " + ex.getErrorCode());
return false;
}
if(conn != null)
{
try {
PreparedStatement stmt = conn.prepareStatement(sql);
stmt.executeUpdate();
return true;
} catch (SQLException ex) {
System.out.println("SQLException: " + ex.getMessage());
System.out.println("SQLState: " + ex.getSQLState());
System.out.println("VendorError: " + ex.getErrorCode());
return false;
}
} else
{
isConnected = false;
connect(); //Attempt to reconnect
if(isConnected = true)
{
Write(sql); //Try the same operation again now that we are connected
} else {
System.out.println("[mcMMO] Unable to connect to MySQL! Make sure the SQL server is online!");
}
}
return false;
}
// Get Int
@ -160,26 +190,35 @@ public class Database {
public Integer GetInt(String sql) {
ResultSet rs = null;
Integer result = 0;
try {
Connection conn = DriverManager.getConnection(connectionString);
PreparedStatement stmt = conn.prepareStatement(sql);
stmt = conn.prepareStatement(sql);
if (stmt.executeQuery() != null) {
stmt.executeQuery();
rs = stmt.getResultSet();
if (rs.next()) {
result = rs.getInt(1);
} else {
result = 0;
}
}
conn.close();
} catch (SQLException ex) {
System.out.println("SQLException: " + ex.getMessage());
System.out.println("SQLState: " + ex.getSQLState());
System.out.println("VendorError: " + ex.getErrorCode());
if(conn != null)
{
try {
PreparedStatement stmt = conn.prepareStatement(sql);
stmt = conn.prepareStatement(sql);
if (stmt.executeQuery() != null) {
stmt.executeQuery();
rs = stmt.getResultSet();
if (rs.next()) {
result = rs.getInt(1);
} else {
result = 0;
}
}
} catch (SQLException ex) {
System.out.println("SQLException: " + ex.getMessage());
System.out.println("SQLState: " + ex.getSQLState());
System.out.println("VendorError: " + ex.getErrorCode());
}
} else {
isConnected = false;
connect(); //Attempt to reconnect
if(isConnected = true)
{
GetInt(sql); //Try the same operation again now that we are connected
} else {
System.out.println("[mcMMO] Unable to connect to MySQL! Make sure the SQL server is online!");
}
}
return result;
}
@ -187,25 +226,35 @@ public class Database {
public HashMap<Integer, ArrayList<String>> Read(String sql) {
ResultSet rs = null;
HashMap<Integer, ArrayList<String>> Rows = new HashMap<Integer, ArrayList<String>>();
try {
Connection conn = DriverManager.getConnection(connectionString);
PreparedStatement stmt = conn.prepareStatement(sql);
if (stmt.executeQuery() != null) {
stmt.executeQuery();
rs = stmt.getResultSet();
while (rs.next()) {
ArrayList<String> Col = new ArrayList<String>();
for (int i = 1; i <= rs.getMetaData().getColumnCount(); i++) {
Col.add(rs.getString(i));
}
Rows.put(rs.getRow(), Col);
}
}
conn.close();
} catch (SQLException ex) {
System.out.println("SQLException: " + ex.getMessage());
System.out.println("SQLState: " + ex.getSQLState());
System.out.println("VendorError: " + ex.getErrorCode());
if(conn != null)
{
try {
PreparedStatement stmt = conn.prepareStatement(sql);
if (stmt.executeQuery() != null) {
stmt.executeQuery();
rs = stmt.getResultSet();
while (rs.next()) {
ArrayList<String> Col = new ArrayList<String>();
for (int i = 1; i <= rs.getMetaData().getColumnCount(); i++) {
Col.add(rs.getString(i));
}
Rows.put(rs.getRow(), Col);
}
}
} catch (SQLException ex) {
System.out.println("SQLException: " + ex.getMessage());
System.out.println("SQLState: " + ex.getSQLState());
System.out.println("VendorError: " + ex.getErrorCode());
}
} else {
isConnected = false;
connect(); //Attempt to reconnect
if(isConnected = true)
{
Read(sql); //Attempt the same operation again now that we are connected
} else {
System.out.println("[mcMMO] Unable to connect to MySQL! Make sure the SQL server is online!");
}
}
return Rows;
}