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Check if backup table already exists to prevent errors

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This commit is contained in:
Eric 2017-08-15 12:03:04 +02:00
parent 8d459220d3
commit 21fd9bb5ed
1 changed files with 29 additions and 12 deletions
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41
src/main/java/de/epiceric/shopchest/sql/Database.java
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@ -98,6 +98,11 @@ public abstract class Database {
"SELECT name FROM sqlite_master WHERE type='table' AND name='shop_list'" : "SELECT name FROM sqlite_master WHERE type='table' AND name='shop_list'" :
"SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME='shop_list'"); "SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME='shop_list'");
String queryCheckIfBackupTableExists =
(Database.this instanceof SQLite ?
"SELECT name FROM sqlite_master WHERE type='table' AND name='shop_list_old'" :
"SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME='shop_list_old'");
String queryCopyTableShopList = "INSERT INTO shops (vendor,product,world,x,y,z,buyprice,sellprice,shoptype) SELECT vendor,product,world,x,y,z,buyprice,sellprice,shoptype FROM shop_list"; String queryCopyTableShopList = "INSERT INTO shops (vendor,product,world,x,y,z,buyprice,sellprice,shoptype) SELECT vendor,product,world,x,y,z,buyprice,sellprice,shoptype FROM shop_list";
String queryRenameTableShopList = "ALTER TABLE shop_list RENAME TO shop_list_old"; String queryRenameTableShopList = "ALTER TABLE shop_list RENAME TO shop_list_old";
@ -111,21 +116,33 @@ public abstract class Database {
ResultSet rs = s2.executeQuery(queryCheckIfTableExists); ResultSet rs = s2.executeQuery(queryCheckIfTableExists);
if (rs.next()) { if (rs.next()) {
plugin.debug("Table 'shop_list' exists: Copying contents..."); plugin.debug("Table 'shop_list' exists");
// Table exists: Copy contents to new table
PreparedStatement ps = connection.prepareStatement(queryCopyTableShopList);
ps.executeUpdate();
ps.close();
plugin.debug("Renaming table..."); // Check if backup table "shop_list_old" already exists
// Rename/Backup old table Statement s3 = connection.createStatement();
PreparedStatement ps2 = connection.prepareStatement(queryRenameTableShopList); ResultSet rs2 = s3.executeQuery(queryCheckIfBackupTableExists);
ps2.executeUpdate();
ps2.close(); if (rs2.next()) {
plugin.debug("Backup table 'shop_list_old' already exists: Cannot backup current table");
} else {
plugin.debug("Backing up old table");
// Table exists: Copy contents to new table
PreparedStatement ps = connection.prepareStatement(queryCopyTableShopList);
ps.executeUpdate();
ps.close();
plugin.debug("Renaming table");
// Rename/Backup old table
PreparedStatement ps2 = connection.prepareStatement(queryRenameTableShopList);
ps2.executeUpdate();
ps2.close();
}
close(s3, rs2);
} }
s2.close(); close(s2, rs);
rs.close();
// Create table "shop_log" // Create table "shop_log"
Statement s3 = connection.createStatement(); Statement s3 = connection.createStatement();